Co-reporter:Tingting Zheng;Yuguo Xia;Xiuling Jiao;Ting Wang
Nanoscale (2009-Present) 2017 vol. 9(Issue 9) pp:3206-3211
Publication Date(Web):2017/03/02
DOI:10.1039/C6NR09930K
Facet-control has been a fascinating method for preparation of highly active photocatalysts. Herein, we report the hydrothermal preparation of single-crystalline ZnGa2O4 nanoprisms with the {111} and {110} facets coexposed. Studies of their photocatalytic performance have revealed that the as-formed nanoprisms exhibit significantly enhanced photocatalytic activities compared with ZnGa2O4 nanocubes with only the {100} facets exposed and nanosheets with the {110} facets exposed for H2 evolution and contaminant degradation. Theoretical calculations combined with valence band XPS results indicate the formation of a surface heterojunction by the coexposed {111} and {110} facets, which promotes the photogenerated electron and hole migration to the {110} and {111} facets, respectively, and enhances the photocatalytic performance.
Co-reporter:Jing Wei, Xiuling Jiao, Ting Wang, and Dairong Chen
ACS Applied Materials & Interfaces 2016 Volume 8(Issue 43) pp:29713
Publication Date(Web):October 13, 2016
DOI:10.1021/acsami.6b10620
Ink-free rewritable media has attracted great attention as a potential alternative to current paper prints, owing to its benefits to reducing paper production and consumption for environmental protection. It is desirable to develop rewritable media based on cheap, robust, and fast-response photochromic systems. Herein, we report the design and fabrication of flexible and photorewritable PVP/a-WO3 hybrid membranes through electrospinning, on which images with high resolution can be photoprinted and heat-erased for over 40 cycles. The well conjugated organic–inorganic hybrid structure endows a fast “electron–proton double injection” from PVP to a-WO3 in the coloration process and greatly improves the photochromic responses. The coloration times can be as short as tens of seconds and the erasure times can be as long as 10 days in ambient conditions. As-formed photochromic membranes are low-cost, environmental benign and easy for large-scale production, indicate their great potential as flexible rewritable media for practical usage.Keywords: electrospinning; hybrid membranes; photochromic; rewritable; tungsten oxide
Co-reporter:Tingting Zheng, Jia-Long Xu, Xiao-Jun Wang, Jian Zhang, Xiuling Jiao, Ting Wang and Dairong Chen
Chemical Communications 2016 vol. 52(Issue 42) pp:6922-6925
Publication Date(Web):27 Apr 2016
DOI:10.1039/C6CC02857H
We report the design and fluorescence properties of a novel aggregation-induced emission (AIE) system obtained by grafting carboxyl group conjugated AIE molecules onto monodispersed colloidal GaOOH nanocubes. Compared with nanoaggregates formed in mixed solvents, as-formed nanohybrids avoid contact with a “good” solvent, restrict the molecular motions more efficiently and show a significantly enhanced AIE.
Co-reporter:Limei Li, Xiuling Jiao, Dairong Chen, and Cheng Li
Crystal Growth & Design 2016 Volume 16(Issue 5) pp:2700
Publication Date(Web):April 4, 2016
DOI:10.1021/acs.cgd.5b01817
In this work, we present a facile approach toward producing multifunctional metal–organic framework (MOF) superstructures by asymmetric growth of continuous MOFs thin films on two-dimensional colloidal crystal arrays anchored at the air–solution interfaces, in which the control over spatial configuration, structural hierarchy, and overall dimensionality of MOF superstructures can be realized all at once. This interfacial growth method also endows MOF superstructures with an unprecedented transferability, which greatly facilitates the interfacing of MOF materials with other functional surfaces. We have demonstrated this by the construction of layered structures (including hybrid ones) that are promising for device applications. Taking advantage of the resultant periodic and hierarchical porous structures, the as-grown MOF superstructures lend themselves to efficient vapor sensing, size-screening of nanoparticles, and removal of dye molecules from aqueous solutions, and have exhibited a superior performance as compared to their unstructured counterparts. Therefore, this work not only presents an efficient route in well-organizing MOF nanocrystals at the meso-/macroscopic scale but also provides an inspiring example of enriching the material performance of MOFs by shaping their physical forms.
Co-reporter:Limei Li, Xiuling Jiao, Dairong Chen, Bettina V. Lotsch, and Cheng Li
Chemistry of Materials 2015 Volume 27(Issue 22) pp:7601
Publication Date(Web):October 27, 2015
DOI:10.1021/acs.chemmater.5b02476
The sorption properties and structural versatility of metal–organic frameworks (MOFs) make them superior chemical sensing materials with both high sensitivity and selectivity, but the fabrication of MOF sensors with optimized performances still remains a major challenge. Herein, we propose a simple yet powerful optical sensing motif based on ultrathin MOF-coated monolayer colloidal crystals (MCCs), which allows for high efficiency in vapor sensing through changes in their effective refractive index (RI). Two optical modes exist in this sensor, namely, photonic eigenmodes and Fabry–Pérot oscillations, both of which can be used as the signal transducer. Selective response to a series of alcohols, water, and acetonitrile was exhibited, reflecting well the characteristic sorption properties of the integrated MOF, with which colorimetric reporting was readily achieved. Linear response to a broad dynamic range of vapor concentration was realized. The sensitivity was found to depend closely on the thickness of the MOF coating and can be further enhanced accordingly. Ultrafast response time (<5 s) and excellent recyclability were also demonstrated. These substantial improvements in performance are attributed to the efficacy of signal transduction and the enhanced pore accessibility and diffusion efficiency, which are intrinsically endowed by the optical motif design. Our findings should provide new insights into the design and fabrication of MOF sensors toward real-world applications.
Co-reporter:Jing Wei, Xiuling Jiao, Ting Wang and Dairong Chen
Journal of Materials Chemistry A 2015 vol. 3(Issue 29) pp:7597-7603
Publication Date(Web):25 Jun 2015
DOI:10.1039/C5TC01350J
Many previous reports have indicated that the applicable photochromism of WO3 can only be achieved by combining with metals, semiconductors or organic polymers to improve the coloration efficiency and reversibility, while the investigation of intrinsic WO3 photochromism has been severely prohibited by its small color change and slow coloration rate. Herein, we report hydrothermally prepared hydrated tungsten oxide nanosheets with fast and reversible intrinsic photochromic response. A gradual yellow-blue color change can be modulated with continuous UV illumination. The following UV/ozone treatment can bleach the nanosheets back to their initial yellowish color within minutes and the reversible process can be continued 20 times without noticeable attenuation, which has never been reported for intrinsic WO3 photo response. The thin-layered nanostructure of WO3 indicates a short ionic diffusion length for surface attached species, which promotes fast surface water decomposition upon UV irradiation and accelerates proton intercalation/deintercalation, thus speeding up both the coloration and the bleaching processes. Our research elucidates that hydrated nanostructured WO3 can present significantly improved photochromic response even without WO3/metal, WO3/semiconductor or WO3/polymer combination, which may lead to technological advances with simple, facilely prepared WO3 nanosheets in areas such as photolithography, rewritable optical memory devices and nanoinks in inkjet printing.
Co-reporter:Wei Li, Yan Wang, Botao Ji, Xiuling Jiao and Dairong Chen
RSC Advances 2015 vol. 5(Issue 72) pp:58120-58127
Publication Date(Web):25 Jun 2015
DOI:10.1039/C5RA09198E
Flexible CeO2–TiO2 fibrous membrane was prepared by an electrospinning combined sol–gel method. The composition, structure, and morphology of the membrane were thoroughly investigated with XRD, FT-IR, N2 adsorption–desorption, SEM and TEM. The tensile-strength of the TiO2–CeO2 was evaluated with a tensile tester and the highest strength (1.38 MPa) was attained at a Ce and Ti molar ratio of 5:100, which was 3 times as high as that of pure TiO2. After Pd was loaded on the fibers, the strength of fibrous membrane (1.28 MPa) stayed almost the same. Moreover, the Pd/CeO2–TiO2 fibrous membrane exhibits high thermal stability against long time usage and retains its strength up to 1.22 MPa after 400 °C for 20 h. Strength performance is mainly due to effective size control of the particles composing the nanofibers; this endows the fibrous membrane with application potential for high efficiency particle filtration. The best filtration performance had an efficiency of 99.86% and a corresponding pressure drop of 178 Pa. At the same time, the fibrous membrane also exhibits good low-temperature CO oxidation performance with a complete conversion of CO to CO2 at 200 °C and no decrease of catalytic activity over 30 h. The excellent properties of this Pd/CeO2–TiO2 fibrous membrane enrich the applications of inorganic fibrous membranes simultaneously for air filtration and catalysis.
Co-reporter:Jian Zhang
The Journal of Physical Chemistry C 2015 Volume 119(Issue 24) pp:13915-13921
Publication Date(Web):May 27, 2015
DOI:10.1021/acs.jpcc.5b02293
The segregation mechanism of metal ions (Na+, K+, Mg2+, Ca2+, Co2+, Ni2+, La3+, Y3+) in γ-AlOOH was investigated during the sol–gel process by a combination of experiments and density functional theory (DFT) calculations. The DFT calculations showed that all of the adsorption energies of metal ions were smaller than the hydrogen ion in neutral conditions, and the metal ions even could not be adsorbed on the protonated γ-AlOOH surface due to electrostatic repulsion. The segregation of metal ions in γ-AlOOH sol during the drying process was caused by weak adsorption of metal ions on the γ-AlOOH surface in acidic conditions and mainly occurred at the late period of drying with the removal of adsorbed water. The computational segregation sequence of metal ions was consistent with experimental results, which was La3+ ≈ Y3+ > Ni2+ ≈ Co2+ > Mg2+ ≈ Ca2+ > K+ ≈ Na+. According to the segregation mechanism during sol–xerogel transition, it is speculated that an additive which could strengthen the combination between metal ions and the protonated γ-AlOOH surface could diminish the segregation. On the basis of this speculation, citric acid was added into the γ-AlOOH sol, and the segregation percentage of La3+ decreased to 3.54% from 16.4%.
Co-reporter:Zhen Jiang, Weijun Lu, Zhengping Li, Kuan Hung Ho, Xu Li, Xiuling Jiao and Dairong Chen
Journal of Materials Chemistry A 2014 vol. 2(Issue 23) pp:8603-8606
Publication Date(Web):02 Apr 2014
DOI:10.1039/C3TA14430E
Amorphous cobalt sulfide polyhedral nanocages are synthesized by utilizing zeolitic imidazolate framework-67 (ZIF-67) nanocrystals as templates. Electrochemical characterization shows that CoS nanocages exhibit high specific capacitances, owing to their amorphous phase and novel structures.
Co-reporter:Zhen Jiang, Zhengping Li, Zhenhua Qin, Haiyan Sun, Xiuling Jiao and Dairong Chen
Nanoscale 2013 vol. 5(Issue 23) pp:11770-11775
Publication Date(Web):27 Sep 2013
DOI:10.1039/C3NR03829G
Layered double hydroxides (LDHs) are currently attracting intense research interest for their various applications. Three LDH hollow nano-polyhedra are synthesized with zeolitic imidazolate framework-67 (ZIF-67) nanocrystals as the templates. The nanocages well inherit the rhombic dodecahedral shape of the ZIF-67 templates, and the shell is composed of nanosheets assembled with an edge-to-face stacking. This is the first synthesis of the LDH non-spherical structures. And the mechanism of utilizing metal–organic framework (MOF) nanocrystals as templates is explored. Control of the simultaneous reactions, the precipitation of the shells and the template etching, is extremely crucial to the preparation of the perfect nanocages. And the Ni–Co LDH nanocages exhibit superior pseudocapacitance property due to their novel hierarchical and submicroscopic structures.
Co-reporter:Zhenhua Qin, Haiyan Sun, Zhen Jiang, Xiuling Jiao and Dairong Chen
CrystEngComm 2013 vol. 15(Issue 5) pp:897-902
Publication Date(Web):12 Nov 2012
DOI:10.1039/C2CE26495A
The monodisperse metal sulfide (Ag2S, CdS, PbS, ZnS, and AgInS2) yolk–shell nanoboxes with sizes of about 220 nm were synthesized through a sacrificial template-directed method based on the Kirkendall effect. In a typical synthetic process for nanoboxes, there were two steps of ion-exchange. The first anion exchange was based on the control of solubility product rule, halide ions in silver halide were replaced by chalcogenide ions, following this a series of metal chalcogenide nanoboxes were obtained based on Pearson hard–soft acids and bases (HSAB) of various metal ions. The obtained CdS showed preferable absorption in the visible light region. This facile method is expected to obtain other nanostructures with preserved morphology.
Co-reporter:Wei Jiang, Xiuling Jiao, Dairong Chen
International Journal of Hydrogen Energy 2013 Volume 38(Issue 29) pp:12739-12746
Publication Date(Web):30 September 2013
DOI:10.1016/j.ijhydene.2013.07.072
•Rapid solvothermal fabrication of high surface area NaTaO3 nanocrystal catalysts.•Size of the nanocrystals was altered by concentration adjustment.•High efficiency water splitting without doping.Uniform NaTaO3 ca. 15 nm and ca. 70 nm nanocrystals were synthesized via a novel surfactant-free solvothermal reaction. The acidic alkoxide hydrolyzation leads to small size and high surface area particles. The different size of the nanocrystals was controlled by altering concentration. The alkoxide-based synthetic route leads to small particle size and high surface area, which improved the charge separation and migration of photogenerated carriers and benefited the surface chemical reaction of catalysts. As a result, the high total yield of photocatalytic water splitting hydrogen generation was obtained, which was as high as 3.106 mmol h−1 g−1.
Co-reporter:Haiyan Sun;Xiuling Jiao;Yanyang Han;Zhen Jiang
European Journal of Inorganic Chemistry 2013 Volume 2013( Issue 1) pp:109-114
Publication Date(Web):
DOI:10.1002/ejic.201201159
Abstract
Sphere-like Fe3O4 aggregates were solvothermally prepared with ethylene glycol, sodium acetate and FeCl3·6H2O as raw materials. The sphere-like Fe3O4 aggregates provided heterogeneous growth sites for Au nanoparticles. These were obtained by reduction of HAuCl4 by sodium citrate under mild reaction conditions and the Fe3O4-Au nanocomposites were subsequently formed. The peroxidase-like activity of nanocomposites was studied with H2O2 and 3,3′,5,5′-tetramethylbenzidine as substrates. Fe3O4-Au nanocomposites exhibited better catalytic activity than pure Fe3O4 aggregates, mainly resulting from the special electronic structure at the interfaces between the sphere-like Fe3O4 aggregates and the gold nanoparticles.
Co-reporter:Pingping Zhang, Xiuling Jiao, Dairong Chen
Materials Letters 2013 Volume 91() pp:23-26
Publication Date(Web):15 January 2013
DOI:10.1016/j.matlet.2012.09.077
Alumina fibers were fabricated by the sol–gel method combined with an electrospinning process using aluminum chloride hexahydrate (AlCl3·6H2O) and aluminum powder as raw materials in water solvent. Calcium oxide–silica (CaO–SiO2) was applied as two-component additive to retard the phase transformation of alumina and control the size of the grains during sintering. With the addition of the CaO–SiO2 in the system, the size of the particles that composed the fibers calcined at 1300 °C significantly decreased compared to that without additive, which might be due to the formation of θ-alumina in the samples. In addition, the fiber had low thermal conductivity and good flexibility, which favored its application in insulation.Highlights► Flexible alumina nanofibers with CaO–SiO2 additive were fabricated. ► CaO–SiO2 additive could inhibit grain growth of the electrospun fibers. ► CaO–SiO2 additive retarded the phase transformation from γ-Al2O3 to α-Al2O3. ► Fiber calcined at 1300 °C with CaO/SiO2 ratio of 1:10 had low thermal conductivity.
Co-reporter:Shenguang Ge;Jinghua Yu;Xiuling Jiao
Journal of Inorganic and Organometallic Polymers and Materials 2013 Volume 23( Issue 5) pp:1113-1121
Publication Date(Web):2013 September
DOI:10.1007/s10904-013-9895-9
A sensitivity-enhanced electro chemiluminescence immunoassay (ECLIA) was fabricated by covalently immobilizing a monoclonal prostate specific antigen (PSA) antibody (anti-PSA, Ab2) and a luminophore (luminol) on dendrimer-encapsulated gold nanoparticles (Den/AuNPs) as electrochemiluminescence labels. The primary antibody was immobilized on Fe3O4@SiO2 NP support, and the antibody-loaded Fe3O4@SiO2 NP was placed onto an indium tin oxide working electrode in a home made electrochemiluminescence (ECL) cell. PSA and Ab2/Luminol/Den/AuNP was successively injected into the cell, and conjugated to form a sandwich-type immunocomplex. Under optimized experimental conditions, the proposed ECLIA provided a linear response range from 0.001 to 100.0 ng/mL with a low detection limit of 0.3 pg/mL. The PSA assay results in clinical serum samples were in good agreement with the commercially available electro chemiluminescence assay. The ECL immunosensor has the advantages of high sensitivity, specificity and stability and may be a promising technique for tumor marker detection.
Co-reporter:Shuqin Shang, Xiuling Jiao, and Dairong Chen
ACS Applied Materials & Interfaces 2012 Volume 4(Issue 2) pp:860
Publication Date(Web):December 29, 2011
DOI:10.1021/am201535u
Submicrometer-sized anatase TiO2 hollow spheres were fabricated through a template-free solvothermal route using TiCl4 as a raw material and a mixture of alcohols–acetone as solvent. Control of the hollow spheres’ size was achieved by adjusting the ratio of alcohols to acetone. Products were characterized by scanning electron microscopy (SEM), transmission electron microscopy (TEM), high resolution TEM, X-ray photoelectron spectra (XPS), X-ray diffraction (XRD), Fourier transform infrared (FT-IR), and thermogravimetric (TG) analysis. It was found that the formation process of the TiO2 hollow spheres might include the hydrolysis of Ti(IV) with the water formed from the solvothermal etherification reaction, the aggregation of the anatase TiO2 nanoparticles, and the Ostwald ripening. Furthermore, the as-prepared TiO2 hollow nanostructures exhibited good photocatalytic activity for the degradation of phenol.Keywords: hollow spheres; nanostructures; photocatalysis; template-free fabrication; TiO2;
Co-reporter:Zhen Jiang, Haiyan Sun, Zhenhua Qin, Xiuling Jiao and Dairong Chen
Chemical Communications 2012 vol. 48(Issue 30) pp:3620-3622
Publication Date(Web):21 Feb 2012
DOI:10.1039/C2CC00004K
Truncated rhombic dodecahedral zeolitic imidazolate framework-8 (ZIF-8) nanocrystals are fabricated with acetate as a modulating ligand; ZnS hollow polyhedra with uniform morphology are obtained using the ZIF-8 templates.
Co-reporter:Zhanxia Shu, Xiuling Jiao and Dairong Chen
CrystEngComm 2012 vol. 14(Issue 3) pp:1122-1127
Publication Date(Web):16 Nov 2011
DOI:10.1039/C1CE06155K
Flower-like hierarchical zirconium oxide sulphate was prepared using Zr(SO4)2·4H2O and CH3COONa as raw materials via a hydrothermal process and the precursor could be transformed by calcination to zirconia nanostructures, maintaining the original morphology. The zirconium oxide sulphate and zirconia nanostructures were investigated in detail and possible formation mechanisms are proposed. In the formation of the flower-like hierarchical zirconium oxide sulphate, pH control by CH3COONa played a crucial role in determining the morphology. Flower-like hierarchical zirconia showed excellent photocatalytic activity for the photodegradation of Rhodamine B.
Co-reporter:Shenguang Ge, Feng Yu, Lei Ge, Mei Yan, Jinghua Yu and Dairong Chen
Analyst 2012 vol. 137(Issue 20) pp:4727-4733
Publication Date(Web):16 Aug 2012
DOI:10.1039/C2AN35967G
The multiplexed immunosensor array was fabricated on a carbon electrode array containing three graphite working electrodes, which was prepared with screen-printed technology. This immunosensor was achieved using graphene (GR) to modify the immunosensor surface for accelerating electron transfer. The in situ synthesis of AuNPs on GR modified electrode surface aimed at the immobilization of capture antibody (Ab1). With a sandwich-type immunoreaction, the alkaline phosphatase (ALP)-labeled antibody (Ab2) functionalized Au cluster (AuCs)/GR was captured on the immunosensor surface to catalyze the hydrolysis of 3-indoxyl phosphate in substrate, which produced an indoxyl intermediate to reduce Ag ion. The silver deposition process was catalyzed by both ALP and AuCs/GR, which amplified the detection signal. The deposited silver was then measured by anodic linear sweep voltammetric stripping analysis in KCl solution. The increase of stripping peak currents was proportional to the logarithm value of the CA 153, CA 125 and CEA concentration in the range 5.0 × 10−3 to 50 U mL−1 for CA 153, 1.0 × 10−3 to 100 U mL−1 for CA 125, and 4.0 × 10−3 to 200 ng mL−1 for CEA, with a limit detection of 1.5 × 10−3 U mL−1 for CA 153, 3.4 × 10−4 U mL−1 for CA 125, and 1.2 × 10−3 ng mL−1 for CEA. The disposable immunosensor array and simple detection method for fast measurement of a panel of tumor markers avoided cross-talk and the need for deoxygenation for the electrochemical immunoassay, and showed significant clinical value for application in cancer screening, providing great potential for convenient point-of-care testing and commercial application.
Co-reporter:Shenguang Ge, Xiuling Jiao and Dairong Chen
Analyst 2012 vol. 137(Issue 19) pp:4440-4447
Publication Date(Web):05 Jul 2012
DOI:10.1039/C2AN35751H
This paper describes a novel electrochemical immunosensor using a nanoporous gold (NPG)/graphene (GN) hybrid platform combined with horseradish peroxidase (HRP)-encapsulated liposomes as labels for the sensitive detection of cancer antigen 15-3 (CA 15-3). The electrochemical detection was based on the released HRP from HRP-encapsulated liposomes toward the reduction of H2O2 with the help of the thionine (TH) electron mediator. In the presence of CA 15-3, HRP@liposomes and TH–NPG–GN formed a sandwich-type immunocomplex, and the immunocomplex increased with the increment of the CA 15-3 concentration in the sample. The more CA 15-3 antigen in the sample there was, the more HRP@liposomes/anti-CA 15-3 in the immunocomplex there were. Thus, the catalytic current increased. Under optimized conditions, the linear range of the immunoassay is 2 × 10−5 to 40 U mL−1 with a detection limit of 5 × 10−6 U mL−1 CA 15-3. The CA 15-3 concentrations of the clinical serum specimens assayed by the developed immunoassay showed consistent results in comparison with those obtained by a commercially available electrochemiluminescence assay. This proposed immunoassay system had many desirable merits including sensitivity, accuracy, and minimal instrumentation required. Significantly, the new protocol may be quite promising, with potentially broad applications for clinical immunoassays.
Co-reporter:Pingping Zhang, ;Xiuling Jiao
European Journal of Inorganic Chemistry 2012 Volume 2012( Issue 26) pp:4167-4173
Publication Date(Web):
DOI:10.1002/ejic.201200292
Abstract
Flexible α-alumina nanofibers were fabricated by the sol–gel method combined with an electrospinning process. The sol was prepared with aluminum isopropoxide and aluminum nitrate as the precursors, nitric acid as the catalyst, and ethanol aqueous solution as the solvent. Small amounts of anhydrous magnesium sulfate as additive acted to stabilize the γ-Al2O3 structure and retard its conversion to α-Al2O3 firstly, and subsequently MgAl2O4 was formed at the grain boundaries to inhibit grain growth. Polyvinylpyrrolidone (PVP) was applied to tune sol viscosity. The fibers with diameters of 300–400 nm are composed of α-Al2O3 nanosheets with thickness in the range of 20–50 nm and stack along [0001] at the axial direction. The fibers exhibited good flexibility and thermal stability.
Co-reporter:Wei Jiang, Xiuling Jiao, Dairong Chen
Materials Letters 2012 Volume 79() pp:248-251
Publication Date(Web):15 July 2012
DOI:10.1016/j.matlet.2012.04.037
Yttrium tantalate (YTaO4) nanostructures were solvothermally prepared at 240 °C without any additives. The quasi-square plate-like products were constructed by 50–70 nm cores and 80–100 nm nanorods with diameter of ~ 15 nm. The central part was formed by nanoparticle aggregation. The YTaO4 nanorods were formed by dissolution–recrystallization. Due to the difference of the crystal growth behavior between Y10Ta4O25 intermediate and YTaO4, the Y10Ta4O25–YTaO4 phase transformation was considered to be responsible for the formation of such exquisite structure. Nanorods grew on four perpendicular directions influenced by imperfect oriented-attachment. The luminescent and magnetic properties of as-prepared YTaO4 were investigated, which showed high luminescence quantum efficiency of 17.4% and weak ferromagnetic property.Highlights► YTaO4 nanostructures were fabricated at low temperature by solvothermal method. ► Nanostructures were composed of an aggregated core and nanorod branches. ► The nanostructures were formed by phase transformation induced growth mode.
Co-reporter:Haiyan Sun, Bo Chen, Xiuling Jiao, Zhen Jiang, Zhenhua Qin, and Dairong Chen
The Journal of Physical Chemistry C 2012 Volume 116(Issue 9) pp:5476-5481
Publication Date(Web):February 8, 2012
DOI:10.1021/jp211986a
A solvothermal process was designed to synthesize magnetite (Fe3O4) nanorods using iron pentacarbonyl (Fe(CO)5), oleic acid, and hexadecylamine as raw materials. In the preparation process, Fe(CO)5 was first decomposed and oxidized to form FeO. Meanwhile, Fe(CO)5 reacted with oleic acid to form iron oleate. In the system water derived from the reaction between oleic acid and hexadecylamine resulted in the hydrolysis of iron oleate to form the initial Fe3O4 nanorods. In the following process, the dissolution of FeO and decomposition of residual Fe(CO)5 as well as the hydrolysis of iron oleate provided the source for the growth of Fe3O4 nanorods, which led to the enlargement of the particles with time. By adjusting the reaction time or the amount of the added hexadecylamine, the length of uniform nanorods could be tuned from 63 to 140 nm. Furthermore, the as-prepared Fe3O4 nanorods showed excellent performance in electrochemical property and exhibited different magnetic property from spherical nanoparticles and nanoplates for their shape anisotropy.
Co-reporter:Bo Chen, Xiuling Jiao and Dairong Chen
CrystEngComm 2011 vol. 13(Issue 1) pp:204-211
Publication Date(Web):31 Aug 2010
DOI:10.1039/C0CE00132E
We designed a new templating synthesis to produce hollow cubic Ag microboxes with net-like nanofiber structures in an ethanol system under ambient conditions. The Ag boxes are characterized by TEM, HR-TEM, FE-SEM, and XRD, which illustrates their novel hierarchical structure. The boxes are composed of metallic Ag crystallites which connect together into a net-like structure to form the walls of the boxes, and the six walls close to form the final hollow cubic Ag microbox. The fabrication mechanism of the Ag boxes is demonstrated by tracking the intermediates in the synthesis procedures. Structural analysis and comparative tests are employed to shed light on the formation mechanism of the net-like nanofiber structure. The structure-dependent surface plasma resonance (SPR) properties of the as-prepared Ag microboxes and nanofibers are described based on the UV/Vis/NIR absorption spectra.
Co-reporter:Shuqin Shang, Keyan Xue, Dairong Chen and Xiuling Jiao
CrystEngComm 2011 vol. 13(Issue 16) pp:5094-5099
Publication Date(Web):15 Jun 2011
DOI:10.1039/C0CE00975J
Rose-like NiO structures were fabricated by calcining the solvothermally formed α-Ni(OH)2 structure with similar morphology. The product was characterized by X-ray diffraction, transmission electron microscopy, scanning electron microscopy, high-resolution transmission electron microscopy, Fourier transform infrared spectroscopy, and thermogravimetric analysis. The rose-like α-Ni(OH)2 nanostructure was an aggregation of nanoparticles with a size of ca. 3–4 nm. The decolorization of acid fuchsine solution was studied using prepared NiO as the catalyst and commercial P25 as the reference. The degradation products were analyzed by gas chromatography-mass spectrometry and ultraviolet-visible spectroscopy. The product exhibited much higher photocatalytic activity than P25.
Co-reporter:Zhenhua Qin, Xiuling Jiao and Dairong Chen
CrystEngComm 2011 vol. 13(Issue 14) pp:4646-4651
Publication Date(Web):09 May 2011
DOI:10.1039/C0CE00702A
A hierarchical magnetite (Fe3O4) nanostructure with coral-like morphology was synthesized by a simple glucose-assisted solvothermal method. The structure consists of tens of twigs with lengths about 1–2 μm. The root of the nanostructure is composed of random-aggregated particles with sizes of ca. 10 nm, and the twigs were formed from the oriented-aggregation of nanoparticles. During the formation of the hierarchical structure, the glucose played an important role: its derivates coordinated with iron ions to control the nucleation and growth of Fe3O4; and it also acted as a morphology-directing agent.
Co-reporter:Guodong Liu, Xiuling Jiao, Zhenhua Qin and Dairong Chen
CrystEngComm 2011 vol. 13(Issue 1) pp:182-187
Publication Date(Web):27 Aug 2010
DOI:10.1039/C0CE00084A
Ultra-thin tetragonal β-In2S3 nanotubes with the outer diameter of 10–20 nm, wall thickness of ca. 2.0 nm and length more than 1.0 μm have been successfully synthesized for the first time via a simple solution route. The polycrystalline nanotube is composed of nanocrystals with a size of 2.0 nm. The formation mechanism of the nanotubes was proposed, which went through the hydrolysis of In3+ cations, the decomposition of lauryl mercaptan and then the heterogeneous nucleation and growth of In2S3. The as-obtained β-In2S3 nanotubes show high photocatalytic performance on the decomposition of Rhodamine B (RhB) under solar irradiation.
Co-reporter:Li Zhang;Xiuling Jiao, ;Mingxia Jiao
European Journal of Inorganic Chemistry 2011 Volume 2011( Issue 34) pp:5258-5264
Publication Date(Web):
DOI:10.1002/ejic.201100793
Abstract
Well-defined boehmite (γ-AlOOH) nanomaterials with regular shapes, which include nanorods, nanobelts, and nanoplates, were prepared by hydrothermal reactions of γ-AlOOH nanoparticles, to which H2SO4, CH3COOH, and HCl were added to regulate the shape of the products. The formation of the nanomaterials with different shapes could be attributed to adsorption of SO42–, CH3COO–, and Cl– on the crystal planes, which affected the oriented aggregation of the raw γ-AlOOH nanoparticles and the growth of the aggregates. The difference in the adsorption abilities of the acidic anions resulted in the different shapes of the products. The corresponding shape-retained γ-Al2O3 nanomaterials were obtained after calcination. Furthermore, the differently shaped nanomaterials exhibited different adsorption capabilities for Cr2O72– in aqueous solution, and the nanobelts showed an adsorption of up to 95.5 %. The exposed crystal facet of the γ-AlOOH nanomaterials is an important factor that affects the adsorption ability.
Co-reporter:Keyan Xue ; Dairong Chen ;Xiuling Jiao
Inorganic Chemistry 2010 Volume 49(Issue 3) pp:1191-1197
Publication Date(Web):December 28, 2009
DOI:10.1021/ic902160m
Mesoporous metal oxides and sulfides were prepared by a simple solvothermal method using inorganic salts as metal sources and diethylene glycol (DEG) as solvent; they are formed by the aggregation of metal compound nanoparticles. The generality of this route to the mesoporous materials was proved by the fabrication of a series of mesoporous materials (TiO2, ZrO2, ZnO, In2O3, ZnS, and In2S3). Due to the different morphologies of nanoparticle subunits, the as-prepared mesoporous materials had different types of mesopores, which could be revealed by the N2 adsorption−desorption isotherms and transmission electron microscopy (TEM) images.
Co-reporter:Botao Ji, Xiuling Jiao, Ning Sui, Yongzheng Duan and Dairong Chen
CrystEngComm 2010 vol. 12(Issue 10) pp:3229-3234
Publication Date(Web):22 Jun 2010
DOI:10.1039/C001786H
Single crystal α-Mn2O3 nanowires were prepared through a simple one-pot molten salt route. The as-prepared samples were characterized by XRD, TEM, SEM, HR-TEM and other techniques. The α-Mn2O3 nanowires display high aspect ratios with diameter about 10–50 nm and length about 20 μm. The formation mechanism was also investigated based on the time-dependent experiments. The prepared Mn2O3 nanowires exhibit excellent catalytic performance on the catalytic oxidation of CO.
Co-reporter:Bo Chen, Xiuling Jiao and Dairong Chen
Crystal Growth & Design 2010 Volume 10(Issue 8) pp:3378-3386
Publication Date(Web):July 6, 2010
DOI:10.1021/cg901497p
A series of nano/submicrometer Ag particles with uniform size-distribution are prepared using ascorbic acid to reduce AgCl in aqueous solution and at ambient conditions. NaOH is used to adjust the redox potential of ascorbic acid, and polyvinylpyrrolidone (PVP) is used to balance the relative rates at which various crystallographic planes of Ag grow. Under the reaction conditions, the nucleation and growth steps are separated, thus controlling the anisotropic growth of the Ag crystals. The products are studied using transmission electron microscopy (TEM), high-resolution TEM (HR-TEM), field emission-scanning electron microscopy (FE-SEM), X-ray diffraction (XRD), and UV−vis spectrophotometry. On this basis, an equation for the relationship between the synthesis conditions and the size of the product was established, which can be applied to produce quantitatively size-controlled and size-designed Ag particles. Scale-up of the synthetic procedure is also conducted to test the prospect of large-scale synthesis of Ag particles for practical industrial applications.
Co-reporter:Xinhong Chang, Dairong Chen, Xiuling Jiao
Polymer 2010 Volume 51(Issue 16) pp:3801-3807
Publication Date(Web):22 July 2010
DOI:10.1016/j.polymer.2010.06.018
Environmentally green carbon aerogels have been prepared as adsorbents for dye-containing wastewater. The aerogels were prepared by carbonization of starch aerogels synthesized from soluble starch through a sol–gel process followed by drying at ambient pressure. The Brunauer-Emmett-Teller (BET) surface areas and pore size distribution were measured by N2 adsorption/desorption, and the surface zeta-potential and microstructure of carbon aerogels were characterized using a scanning electron microscope (SEM) and zeta-potential analyzer. SEM images indicate that the carbon aerogels consist of flakes with side length of 60–120 μm and thickness of 3–4 μm. The flakes are irregular in shape and composed of spherical carbon nanoparticles of 10–30 nm. The carbon aerogels have both microporous and mesoporous structures and exhibit high specific surface areas, the highest value is 1571 m2/g. The mean diameter of the micropores is 0.89 nm and that of the mesopores is 2–10 nm. At pH = 10, the carbon aerogels have a zeta-potential of −40 mV and exhibit high adsorption capacities for cationic dyes, such as crystal violet (CV), methyl violet (MV) and methylene blue (MB), from aqueous solution. The largest adsorption capacities for CV, MV and MB are 1515, 1423 and 1181 mg/g, respectively.
Co-reporter:Zhongqiang Zhao, Xiuling Jiao and Dairong Chen
Journal of Materials Chemistry A 2009 vol. 19(Issue 19) pp:3078-3083
Publication Date(Web):23 Mar 2009
DOI:10.1039/B819849G
TiO2 (anatase) aerogels with high surface area were prepared through solvothermally treating the TiO2 based wet-gels prepared by the sol-gel method, followed by atmosphere-drying to remove the solvents from the gels. This route provided a new strategy for the preparation of crystalline metal oxide aerogels. The microstructure of the aerogel was studied in detail. The aerogels solvothermally treated at 140 °C exhibited a high BET surface area of 528.9 m2/g. All the aerogels showed extensive photoluminescent emission at 467, 555 and 615 nm, whose intensity decreased with the solvothermal temperature increasing and significantly increased after calcinations.
Co-reporter:Xiao Jia, Dairong Chen, Xiuling Jiao and Shumei Zhai
Chemical Communications 2009 (Issue 8) pp:968-970
Publication Date(Web):19 Dec 2008
DOI:10.1039/B813524J
Water-dispersible Fe3O4nanoparticles have been prepared by a simple solution method, in which the particle size (3–11 nm) can be tuned by simply adjusting the reaction temperature and time; the formation mechanism of Fe3O4nanoparticles is proposed and their low cytotoxicity has also been proved.
Co-reporter:Jian Lu, Dairong Chen, Xiuling Jiao and Wei Li
Crystal Growth & Design 2009 Volume 9(Issue 7) pp:3296
Publication Date(Web):May 18, 2009
DOI:10.1021/cg900077u
Solution-based fabrication of triangular pyramid polymer shells with one face open is demonstrated through deposition onto a triangular-pyramid template with anisotropic surface properties. To our knowledge, such anisotropic coatings have not been achieved previously by solution-based methods. The polymer shells can be transformed to magnetic porous shells (a composite of iron nanoparticles embedded in a carbon matrix) which exhibit high saturation magnetization and which were found to adsorb dyes rapidly and in a reuseable fashion. The morphologies of the pyramid templates, the polymer coatings, and the magnetic shell were characterized in detail. It should be possible to make shells of many different compositions using polyhedral templates with anisotropic surface properties, such as the one we employ in this work.
Co-reporter:Guodong Liu, Dairong Chen and Xiuling Jiao
CrystEngComm 2009 vol. 11(Issue 9) pp:1828-1830
Publication Date(Web):01 Jul 2009
DOI:10.1039/B904595N
Nanostructured metastable corundum-type In2O3 was directly synthesized by a low temperature solvothermal method and the effects of precursors on the products are investigated.
Co-reporter:Cuiqing Wang, Dairong Chen and Xiuling Jiao
The Journal of Physical Chemistry C 2009 Volume 113(Issue 18) pp:7714-7718
Publication Date(Web):April 14, 2009
DOI:10.1021/jp809855d
Three-dimensional flower-like In2O3 nanostructures with a uniform diameter of ca. 0.7−1.2 μm were fabricated via the glycerol-mediated solvothermal reaction followed by calcination. The flower-like indium precursor and In2O3 nanostructures were investigated in detail, and the as-formed indium precursor could be transformed to cubic In2O3 maintaining its original flower-like morphology after calcination. The formation mechanism, which included the formation of In(OH)3 nanoparticles and their aggregation as well as the reaction between In(OH)3 and glycerol, was proposed. In addition, the room-temperature photoluminescence (PL) spectrum of the In2O3 nanostructure showed peculiar visible emissions.
Co-reporter:Jian Lu, Xiuling Jiao, Dairong Chen and Wei Li
The Journal of Physical Chemistry C 2009 Volume 113(Issue 10) pp:4012-4017
Publication Date(Web):2017-2-22
DOI:10.1021/jp810583e
γ-Fe2O3 nanoplates were prepared by a simple solution process and could be transformed to Fe3O4 nanoplates while keeping the size and morphology unchanged after reduction in hydrazine solution. The crystal structure and surface organic groups of the nanoplates were characterized in detail. The nanoplates exhibited good dispersibility in polar solvents except water and strong dipolar interactions, which favored the formation of one-dimensional chainlike structure. The poly(vinylpyrrolidone) molecules in this system played a key role for the growth of nanoplates, and it was supposed that the formation of nanoplates was a kinetically controlled process. The γ-Fe2O3 and Fe3O4 nanoplates with strong dipolar interactions are ferromagnetic at room temperature.
Co-reporter:Sihui Zhan, Dairong Chen, Xiuling Jiao
Journal of Colloid and Interface Science 2008 Volume 318(Issue 2) pp:331-336
Publication Date(Web):15 February 2008
DOI:10.1016/j.jcis.2007.10.044
SiO2 hollow nanostructured fibers with hierarchical walls have been fabricated by the sol–gel combined two-capillary spinneret co-electrospinning technique using triblock copolymer as the porous directing agent. The as-prepared SiO2 hollow nanostructured fibers were as long as 10 cm with the outer diameter of 400–600 nm and shell thickness of 50–200 nm, and their walls contained the random mesopores with the size of 6.6 nm and the micropores with size of 0.6 nm based on the N2 absorption–desorption isotherm.SiO2 hollow nanostructured fibers with hierarchical meso/microporous walls have been fabricated by the sol–gel combined two-capillary spinneret co-electrospinning technique.
Co-reporter:Yongde Meng, ;Xiuling Jiao
European Journal of Inorganic Chemistry 2008 Volume 2008( Issue 25) pp:4019-4023
Publication Date(Web):
DOI:10.1002/ejic.200800432
Abstract
CoFe2O4 hollow spheres with sizes ranging from 600 nm to 1 μm were prepared through hydrothermal treatment of an aqueous solution containing glucose, ammonium iron(II) sulfate hexahydrate [(NH4)2Fe(SO4)2·6H2O], and cobalt(II) sulfate heptahydrate [CoSO4·7H2O], followed by calcination. The wall of the CoFe2O4 hollow spheres is composed of CoFe2O4 spinel nanoparticles with a size of ca. 30 nm and wall thickness of ca. 150 nm. Magnetic characterization indicates high coercivity and low saturation magnetization, which indicate potential applications as high-density magnetic recording materials and drug carriers.(© Wiley-VCH Verlag GmbH & Co. KGaA, 69451 Weinheim, Germany, 2008)
Co-reporter:Xinhong Chang, Dairong Chen and Xiuling Jiao
The Journal of Physical Chemistry B 2008 Volume 112(Issue 26) pp:7721-7725
Publication Date(Web):June 11, 2008
DOI:10.1021/jp8011359
New natural polymer-based aerogels, cross-linked chitosan aerogels, were prepared by the sol−gel route with glutaradehyde, glyoxal, and formaldehyde as cross-linkers. The alcogels were dried by supercritical carbon dioxide (CO2) fluid extraction. The resulting materials were characterized using scanning electron microscopy (SEM), nitrogen adsorption/desorption analysis, and Fourier transform infrared (FT-IR) spectroscopy. Furthermore, the adsorption of the anionic surfactant sodium dodecylbenzene-sulfonate (SDBS) from aqueous solution by the materials was investigated. The aerogels exhibit high adsorption capability, can remove SDBS from acidic aqueous solutions, and have potential applications in controlling SDBS pollution.
Co-reporter:Yuanxiang Gu, Dairong Chen, Xiuling Jiao and Fangfang Liu
Journal of Materials Chemistry A 2007 vol. 17(Issue 18) pp:1769-1776
Publication Date(Web):06 Feb 2007
DOI:10.1039/B614205B
Core–shell LiCoO2–MgO fibers for use as lithium ion batteries were prepared by co-electrospinning combined with a sol-gel process. The rheological properties and viscosity of the spinnable sols, and the pressures of the two sols during the co-electrospinning process were investigated, which had an obvious effect on the diameter and shell thickness of the core–shell fibers. The fibers had a highly crystalline LiCoO2 core composed of partially oriented nanocrystals and a poorly crystalline MgO shell. The cyclic voltammogram (CV) experiments indicated that the coaxial fiber electrode exhibited excellent reversibility, smaller impedance growth and preferable electrochemical properties with obvious improvement of cyclability compared to bare LiCoO2 fiber electrodes.
Co-reporter:Sihui Zhan, Dairong Chen, Xiuling Jiao and Yang Song
Chemical Communications 2007 (Issue 20) pp:2043-2045
Publication Date(Web):21 Feb 2007
DOI:10.1039/B618905A
Mesoporous TiO2/SiO2 composite nanofibers with a diameter of 100–200 nm and silica shell thickness of 5–50 nm have been fabricated by a sol–gel combined two-capillary co-electrospinning method; the composite nanofibers exhibited selective photocatalytic activity based on the decomposition of Methylene Blue, Active Yellow and Disperse Red.
Co-reporter:Yang Tian, Dairong Chen, Xiuling Jiao and Yongzheng Duan
Chemical Communications 2007 (Issue 20) pp:2072-2074
Publication Date(Web):22 Feb 2007
DOI:10.1039/B700385D
Single crystalline Li4Mn5O12 nanowires with cubic phase were prepared in a large scale by a simple molten salt route without using any surfactant as template; the nanowires exhibited high storage capacity and coulombic efficiency as cathode materials for lithium-ion batteries.
Co-reporter:Sihui Zhan, Dairong Chen, Xiuling Jiao, Shusheng Liu
Journal of Colloid and Interface Science 2007 Volume 308(Issue 1) pp:265-270
Publication Date(Web):1 April 2007
DOI:10.1016/j.jcis.2006.12.026
Long α-Fe2O3 hollow fibers have been prepared through a facile sol–gel combined co-electrospinning technique using ferric citrate as precursor, and α-Fe and γ-Fe2O3 hollow fibers have been obtained by reduction and reoxidation at different conditions. The outer diameter of the as-prepared hollow fibers is 0.5–5 μm with wall thickness of 200–800 nm. The obtained tubular fibers were characterized by thermal gravimetric (TG), FT-IR spectra, X-ray diffraction (XRD), transmission electron microscopy (TEM), scanning electron microscopy (SEM) and Raman techniques. In addition, magnetic properties of α-Fe and γ-Fe2O3 hollow fibers have also been investigated.Long α-Fe2O3 hollow fibers have been prepared through sol–gel method combined with co-electrospinning technology, and α-Fe and γ-Fe2O3 hollow fibers have been obtained by deoxidize at different conditions.
Co-reporter:Yuanxiang Gu;Xiuling Jiao
Journal of Sol-Gel Science and Technology 2007 Volume 43( Issue 2) pp:245-249
Publication Date(Web):2007 August
DOI:10.1007/s10971-007-1572-4
Hollow LiNiO2 fibers have been prepared with a capillary spinneret electrospinning technique combined with the sol–gel method, and the possible mechanism for the fabrication of the hollow fibers was discussed. The xerogel fibers and those calcined at different temperatures were characterized by thermogravimetric (TG) analysis, X-ray diffractometry (XRD), Fourier transform infrared (FT-IR) spectrum, transmission electron microscopy (TEM), scanning electron microscopy (SEM) and etc. The Polyvinyl Pyrrolidone (PVP) has an important role in the formation of hollow LiNiO2 fibers.
Co-reporter:T. He;D. Chen;X. Jiao;Y. Wang
Advanced Materials 2006 Volume 18(Issue 8) pp:1078-1082
Publication Date(Web):7 APR 2006
DOI:10.1002/adma.200501864
Co3O4 nanoboxes (see figure), prepared by a template-synthesis process and composed of compactly assembled cuboid Co3O4 nanocrystals, are reported. Heterogeneous nucleation and interparticle coarsening growth of the nanocrystals is proposed as the formation mechanism. These nanoboxes are characterized by their unexpected magnetic behavior, and may lead to the possibility of novel metal oxide hierarchical structures.
Co-reporter:Yuanxiang Gu, Dairong Chen, Xiuling Jiao and Fangfang Liu
Journal of Materials Chemistry A 2006 vol. 16(Issue 44) pp:4361-4366
Publication Date(Web):19 Sep 2006
DOI:10.1039/B608663B
1D arrays of Li1 + αV3O8 nanosheets have been fabricated by using electrospinning combined with the sol–gel process. The 1D nanostructures, depending on the anisotropic nature of the sol precursor, can be changed by adjusting the calcining temperature and electrospinning parameters. In the present work, the microstructure and formation mechanism of 1D nanostructures are studied, and their initial discharge capacity as the positive electrode material for lithium ion batteries is ca. 352 mAh g−1 and remains ca. 255 mAh g−1 after 40 cycles, which gives higher charge–discharge capacities and better cycle performance compared to the separated Li1 + αV3O8 nanosheets.
Co-reporter:Changlong Chen, Dairong Chen, Xiuling Jiao and Cuiqing Wang
Chemical Communications 2006 (Issue 44) pp:4632-4634
Publication Date(Web):28 Sep 2006
DOI:10.1039/B610120H
Single-crystalline metastable corundum-type In2O3 nanotubes were prepared by annealing solvothermally synthesized InOOH nanotubes under ambient pressure at 300 °C, and the formation mechanism of the nanotubes was investigated.
Co-reporter:Qifang Lu, Dairong Chen and Xiuling Jiao
Journal of Materials Chemistry A 2003 vol. 13(Issue 5) pp:1127-1131
Publication Date(Web):02 Apr 2003
DOI:10.1039/B300980G
Long ZrTiO4 fibers have been synthesized through a sol–gel process using titanium sulfate and zirconium oxychloride octahydrate as starting materials without any organic component. In this system, SO42− anions are a chelating reagent and can coordinate to metal ions (Ti and Zr) with its oxygen atoms which make the inorganic polymer easily form and the sols spinnable. The ZrTiO4 fibers with an average length of ca. 40 cm are composed of nanoparticles (particle size <25 nm) of the order of 600 nm to 5 µm in diameter. The transformation of the green gel fibers to ZrTiO4 fibers has been investigated by TGA, FTIR, XRD, SEM, TEM and UV techniques. Furthermore the microstructures of the ZrTiO4 fibers have also been characterized, and the fiber density is up to 98.2% of its theoretical value.
Co-reporter:Dehong Chen, Dairong Chen, Xiuling Jiao, Yuting Zhao, Maoshuai He
Powder Technology 2003 Volume 133(1–3) pp:247-250
Publication Date(Web):30 July 2003
DOI:10.1016/S0032-5910(03)00079-2
The octahedral nickel ferrite powders were prepared from α-FeOOH and amorphous Ni(OH)2 in high alkali medium via a hydrothermal process. The uniformity of the products can be controlled by simply adjusting the concentration of the NaOH solution. The products were characterized by XRD, TEM, IR and vibrating sample magnetometer (VSM) techniques. The effects of the precursors and reaction conditions on the crystallization of the products are also discussed.
Co-reporter:Hao Zhang, Dairong Chen, Xiuling Jiao
Materials Research Bulletin 2003 Volume 38(Issue 6) pp:1033-1043
Publication Date(Web):26 May 2003
DOI:10.1016/S0025-5408(03)00087-4
CdS nanoparticles coating SrZrxTi1−xO3 (x=0.27) microparticles were obtained by sonochemical reaction, and the as-prepared composites products were characterized by TEM, XRD, FT-IR and other techniques and the fabrication mechanism was also discussed. Moreover, the photocatalystic properties of the final products were investigated by degradation of methylene blue. By coating CdS nanoparticles, the absorption of the UV-Vis spectrum of SrZrxTi1−xO3 red-shifted, but the emission fluorescence spectrum blue-shifted. Adjusting the reactant concentration can control the thickness of the CdS layer.
Co-reporter:Cairong Gong, Dairong Chen, Xiuling Jiao and Qilong Wang
Journal of Materials Chemistry A 2002 vol. 12(Issue 6) pp:1844-1847
Publication Date(Web):26 Apr 2002
DOI:10.1039/B201243J
Continuous iron oxide gel fibers were prepared by the sol–gel method using ferric alkoxide and acetic acid as starting materials and alcohol as solvent, and continuous hollow α-Fe2O3 fibers produced after the gel fibers were heat treated at 400 °C for 1 h. The outer diameter of the α-Fe2O3 fibers is between 4–10 µm and the wall thickness is 1–2 µm, in which the α-Fe2O3 particle size is about 100 nm. 2-Methoxyethanol and acetic acid played important roles in the formation of the spinnable sol and the possible mechanism for the formation of the hollow α-Fe2O3 fibers was discussed in detail. The hollow α-Fe fibers could be obtained by reducing the as-prepared α-Fe2O3 fibers under hydrogen flow and the α-Fe particle size increased to ∼150 nm.
Co-reporter:Qifang Lu, Dairong Chen and Xiuling Jiao
Journal of Materials Chemistry A 2002 vol. 12(Issue 3) pp:687-690
Publication Date(Web):16 Jan 2002
DOI:10.1039/B106238G
Dense Pb1 − xLaxTiO3
(PLT, x = 0.0∼0.2) ceramic fibers were prepared by the sol–gel-related solvothermal method using lead acetate trihydrate, lanthanum acetate hydrate and titanium isopropoxide as the starting materials. The as-drawn fibers were pretreated in organic solvents, dimethylbenzene and triethylamine, using the solvothermal process prior to the heat treatment for crystallization so as to dehydrate the fibers in situ, remove the organic components and to improve the densification of the precursor fibers. The effects of the solvothermal treatment on the structure and composition of the resultant dense, crack-free transparent PLT ceramic fibers have been investigated. Furthermore, the PLT fibers have been characterized by IR, XRD, SEM, TEM and other techniques.
Co-reporter:Xiuling Jiao, Dairong Chen, Yong Hu
Materials Research Bulletin 2002 Volume 37(Issue 9) pp:1583-1588
Publication Date(Web):8 August 2002
DOI:10.1016/S0025-5408(02)00857-7
A series of nanocrystalline MxZn1−xFe2O4 (M=Ni, Mn and Co; x=0.40–0.60) powders have been successfully prepared via hydrothermal process and characterized by XRD, TEM and IR techniques. The effects of reaction temperature and the initial pH value of the starting suspension solution on the particulate properties such as the particle size and morphology are discussed. IR spectra indicate that there are no hydroxyl in as-prepared NixZn1−xFe2O4 and CoxZn1−xFe2O4 powders, while there are obvious hydroxyl adsorption on the IR spectrum of MnxZn1−xFe2O4 powder.
Co-reporter:Dehong Chen, Xiuling Jiao, Dairong Chen
Materials Research Bulletin 2001 Volume 36(5–6) pp:1057-1064
Publication Date(Web):March–April 2001
DOI:10.1016/S0025-5408(01)00582-7
Well-defined and different morphologic α-Fe2O3 particles with a well dispersibility have been prepared from Fe(OH)3 gel via the solvothermal process in the presence of n-butylalcohol or dimethylbenzene as medium and characterized by XRD, TEM, and IR techniques. The effects of the solvents and reaction conditions on the particle morphology were also discussed.
Co-reporter:Tao He, Xiuling Jiao, Dairong Chen, Mengkai Lü, Duorong Yuan, Dong Xu
Journal of Non-Crystalline Solids 2001 Volume 283(1–3) pp:56-62
Publication Date(Web):May 2001
DOI:10.1016/S0022-3093(01)00353-2
A spinnable zirconium sol is obtained by electrolyzing an aqueous solution containing ZrOCl2·8H2O, Y(NO3)·6H2O and H2SO4. The effects of reactant concentration, electric current density and electrolysis temperature on the formation of zirconium sol and its spinnability have been studied. The green fibers and those sintered at different temperatures are characterized by thermogravimetry–differential thermal analysis (TG–DTA), X-ray diffraction (XRD), infrared (IR), scanning electron microscope (SEM) and transmission electron microscope (TEM) techniques.
Co-reporter:Dairong Chen, Xiuling Jiao
Materials Research Bulletin 2001 Volume 36(1–2) pp:355-363
Publication Date(Web):January 2001
DOI:10.1016/S0025-5408(01)00513-X
Tetragonal Bi4Ti3O12 powders have been hydrothermally prepared from different precursors and characterized by XRD, TEM, FTIR and Raman techniques. The effects of reaction conditions such as alkali concentration, reaction temperature and time as well as the precursors on the particle properties are investigated. The hydrothermal powders with spherical and plate-like morphologies appear low agglomeration and narrow particle size distribution.
Co-reporter:D Chen, X Jiao, M Zhang
Materials Research Bulletin 2000 Volume 35(Issue 13) pp:2101-2108
Publication Date(Web):October 2000
DOI:10.1016/S0025-5408(00)00418-9
(Zr1−xSnx)TiO4 (x = 0.05–0.20) powders with a single phase were prepared under mild conditions by the hydrothermal method, and characterized in detail by X-ray diffraction (XRD), transmission electron microscopy (TEM), and other techniques. The reaction conditions such as temperature, time, and alkali concentration were investigated, and the microwave properties of the as-prepared powders were measured. Compared with particles synthesized by the sol-gel process, the hydrothermal particles have low agglomeration and regular morphologies.
Co-reporter:Dairong Chen, Xiuling Jiao, Gang Cheng
Solid State Communications 1999 Volume 113(Issue 6) pp:363-366
Publication Date(Web):30 December 1999
DOI:10.1016/S0038-1098(99)00472-X
Zinc oxide powders have been successfully prepared via hydrothermal process. The effects of reaction temperature and organic additives on the particulate properties such as the particle morphology and size are discussed. The result reveals that high temperature leads to a similar growth speed of different crystallographic planes and several templates result in the formation of particles with different morphologies and sizes.
Co-reporter:Yuanxiang Gu, Dairong Chen, Xiuling Jiao and Fangfang Liu
Journal of Materials Chemistry A 2007 - vol. 17(Issue 18) pp:NaN1776-1776
Publication Date(Web):2007/02/06
DOI:10.1039/B614205B
Core–shell LiCoO2–MgO fibers for use as lithium ion batteries were prepared by co-electrospinning combined with a sol-gel process. The rheological properties and viscosity of the spinnable sols, and the pressures of the two sols during the co-electrospinning process were investigated, which had an obvious effect on the diameter and shell thickness of the core–shell fibers. The fibers had a highly crystalline LiCoO2 core composed of partially oriented nanocrystals and a poorly crystalline MgO shell. The cyclic voltammogram (CV) experiments indicated that the coaxial fiber electrode exhibited excellent reversibility, smaller impedance growth and preferable electrochemical properties with obvious improvement of cyclability compared to bare LiCoO2 fiber electrodes.
Co-reporter:Jing Wei, Xiuling Jiao, Ting Wang and Dairong Chen
Journal of Materials Chemistry A 2015 - vol. 3(Issue 29) pp:NaN7603-7603
Publication Date(Web):2015/06/25
DOI:10.1039/C5TC01350J
Many previous reports have indicated that the applicable photochromism of WO3 can only be achieved by combining with metals, semiconductors or organic polymers to improve the coloration efficiency and reversibility, while the investigation of intrinsic WO3 photochromism has been severely prohibited by its small color change and slow coloration rate. Herein, we report hydrothermally prepared hydrated tungsten oxide nanosheets with fast and reversible intrinsic photochromic response. A gradual yellow-blue color change can be modulated with continuous UV illumination. The following UV/ozone treatment can bleach the nanosheets back to their initial yellowish color within minutes and the reversible process can be continued 20 times without noticeable attenuation, which has never been reported for intrinsic WO3 photo response. The thin-layered nanostructure of WO3 indicates a short ionic diffusion length for surface attached species, which promotes fast surface water decomposition upon UV irradiation and accelerates proton intercalation/deintercalation, thus speeding up both the coloration and the bleaching processes. Our research elucidates that hydrated nanostructured WO3 can present significantly improved photochromic response even without WO3/metal, WO3/semiconductor or WO3/polymer combination, which may lead to technological advances with simple, facilely prepared WO3 nanosheets in areas such as photolithography, rewritable optical memory devices and nanoinks in inkjet printing.
Co-reporter:Tingting Zheng, Jia-Long Xu, Xiao-Jun Wang, Jian Zhang, Xiuling Jiao, Ting Wang and Dairong Chen
Chemical Communications 2016 - vol. 52(Issue 42) pp:NaN6925-6925
Publication Date(Web):2016/04/27
DOI:10.1039/C6CC02857H
We report the design and fluorescence properties of a novel aggregation-induced emission (AIE) system obtained by grafting carboxyl group conjugated AIE molecules onto monodispersed colloidal GaOOH nanocubes. Compared with nanoaggregates formed in mixed solvents, as-formed nanohybrids avoid contact with a “good” solvent, restrict the molecular motions more efficiently and show a significantly enhanced AIE.
Co-reporter:Zhen Jiang, Haiyan Sun, Zhenhua Qin, Xiuling Jiao and Dairong Chen
Chemical Communications 2012 - vol. 48(Issue 30) pp:NaN3622-3622
Publication Date(Web):2012/02/21
DOI:10.1039/C2CC00004K
Truncated rhombic dodecahedral zeolitic imidazolate framework-8 (ZIF-8) nanocrystals are fabricated with acetate as a modulating ligand; ZnS hollow polyhedra with uniform morphology are obtained using the ZIF-8 templates.
Co-reporter:Zhongqiang Zhao, Xiuling Jiao and Dairong Chen
Journal of Materials Chemistry A 2009 - vol. 19(Issue 19) pp:NaN3083-3083
Publication Date(Web):2009/03/23
DOI:10.1039/B819849G
TiO2 (anatase) aerogels with high surface area were prepared through solvothermally treating the TiO2 based wet-gels prepared by the sol-gel method, followed by atmosphere-drying to remove the solvents from the gels. This route provided a new strategy for the preparation of crystalline metal oxide aerogels. The microstructure of the aerogel was studied in detail. The aerogels solvothermally treated at 140 °C exhibited a high BET surface area of 528.9 m2/g. All the aerogels showed extensive photoluminescent emission at 467, 555 and 615 nm, whose intensity decreased with the solvothermal temperature increasing and significantly increased after calcinations.
Co-reporter:Zhen Jiang, Weijun Lu, Zhengping Li, Kuan Hung Ho, Xu Li, Xiuling Jiao and Dairong Chen
Journal of Materials Chemistry A 2014 - vol. 2(Issue 23) pp:NaN8606-8606
Publication Date(Web):2014/04/02
DOI:10.1039/C3TA14430E
Amorphous cobalt sulfide polyhedral nanocages are synthesized by utilizing zeolitic imidazolate framework-67 (ZIF-67) nanocrystals as templates. Electrochemical characterization shows that CoS nanocages exhibit high specific capacitances, owing to their amorphous phase and novel structures.
Co-reporter:Yang Tian, Dairong Chen, Xiuling Jiao and Yongzheng Duan
Chemical Communications 2007(Issue 20) pp:NaN2074-2074
Publication Date(Web):2007/02/22
DOI:10.1039/B700385D
Single crystalline Li4Mn5O12 nanowires with cubic phase were prepared in a large scale by a simple molten salt route without using any surfactant as template; the nanowires exhibited high storage capacity and coulombic efficiency as cathode materials for lithium-ion batteries.
Co-reporter:Sihui Zhan, Dairong Chen, Xiuling Jiao and Yang Song
Chemical Communications 2007(Issue 20) pp:NaN2045-2045
Publication Date(Web):2007/02/21
DOI:10.1039/B618905A
Mesoporous TiO2/SiO2 composite nanofibers with a diameter of 100–200 nm and silica shell thickness of 5–50 nm have been fabricated by a sol–gel combined two-capillary co-electrospinning method; the composite nanofibers exhibited selective photocatalytic activity based on the decomposition of Methylene Blue, Active Yellow and Disperse Red.
Co-reporter:Xiao Jia, Dairong Chen, Xiuling Jiao and Shumei Zhai
Chemical Communications 2009(Issue 8) pp:NaN970-970
Publication Date(Web):2008/12/19
DOI:10.1039/B813524J
Water-dispersible Fe3O4nanoparticles have been prepared by a simple solution method, in which the particle size (3–11 nm) can be tuned by simply adjusting the reaction temperature and time; the formation mechanism of Fe3O4nanoparticles is proposed and their low cytotoxicity has also been proved.
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