Co-reporter:Yeteng Zhong;Gan Tian;Zhanjun Gu;Yijun Yang;Lin Gu;Yuliang Zhao;Jiannian Yao
Advanced Materials 2014 Volume 26( Issue 18) pp:2831-2837
Publication Date(Web):
DOI:10.1002/adma.201304903
Co-reporter:Yijun Yang;Yeteng Zhong;Dr. Xi Wang; Ying Ma; Jiannian Yao
Chemistry – An Asian Journal 2014 Volume 9( Issue 6) pp:1563-1569
Publication Date(Web):
DOI:10.1002/asia.201301704
Abstract
Ultrathin two-dimensional nanosheets have been widely studied because of their peculiar properties and promising applications. As a typical layered material, successful exfoliation of freestanding ultrathin lepidocrocite (γ-FeOOH) nanosheets from the bulk material has not been reported to date. Herein, we report a facile synthetic route to prepare ultrathin lepidocrocite nanosheets with a thickness of approximately 2–3 nm from FeOx–propanediol layered precursors through weakening of the hydrogen bonds during the crystallization process. The ultrathin morphology and single-crystal structure of the nanosheets were confirmed by transmission electron microscopy, X-ray diffraction, and atomic force microscopy. The formation process of these nanosheets demonstrated simultaneous exfoliation and crystallization of lepidocrocite in basic aqueous solution. The obtained ultrathin nanosheets exhibited a much lower Néel temperature (18.3 K) than bulk lepidocrocite and weak ferromagnetic behavior below this temperature.
Co-reporter:Yeteng Zhong, Yijun Yang, Ying Ma and Jiannian Yao
Chemical Communications 2013 vol. 49(Issue 88) pp:10355-10357
Publication Date(Web):26 Jun 2013
DOI:10.1039/C3CC43673J
By using 1,5-pentanediol as a capping and structure directing agent, ultrathin Eu2O3 nanosheets (<1 nm) have been synthesized and assembled into a layered structure. The lateral dimensions of the nanosheets can be tuned by simply controlling the reaction time. These layered structures exhibit a strong quantum size effect due to the extremely small thickness of the assembled nanosheets.
Co-reporter:Xi Wang, Yi-Jun Yang, Ying Ma, Jian-Nian Yao
Chinese Chemical Letters 2013 Volume 24(Issue 1) pp:1-6
Publication Date(Web):January 2013
DOI:10.1016/j.cclet.2013.01.017
As one type of promising candidates for environmental and energy-related systems, multi-shelled transition metal oxide hollow structures (MS-TMOHSs) have drawn great scientific and technical interest in the past few years. This article highlights recent advances in one-pot solution synthesis of MS-TMOHSs. We begin it with an overview of synthetic strategies that have been exploited to achieve these peculiar structures. We then focus on one-pot solution approaches in the following four sections: i) soft templates directed growth; ii) Ostwald ripening; iii) controlled etching; and iv) gas bubble assisted growth. After giving a brief discussion on the unique properties and applications of these multi-shelled hollow structures, we conclude this review with the general challenges and the potential future directions of this exciting area of research.Recent advances in one-pot solution synthesis of multi-shelled transition metal oxide hollow structures are highlighted here.
Co-reporter:Dr. Xi Wang;Yijun Yang;Dr. Tianyou Zhai;Yeteng Zhong;Dr. Zhanjun Gu; Y. Charles Cao; Yuliang Zhao;Dr. Ying Ma; Jiannian Yao
Chemistry - A European Journal 2013 Volume 19( Issue 17) pp:5442-5449
Publication Date(Web):
DOI:10.1002/chem.201202452
Abstract
We have demonstrated a new and facile bottom-up protocol for the effective synthesis of oval-shaped iron oxide/ethylene glycol (FeOx/EG) mesostructured nanosheets. Deprotonated ethylene glycol molecules are intercalated into iron oxide layers to form an interlayer distance of 10.6 Å. These materials display some peculiar magnetic properties, such as the low Morin temperature TM and ferromagnetism below this TM value. CdSe/ZnS nanoparticles can be loaded onto these mesostructured nanosheets to produce nanocomposites that combine both magnetic and fluorescence functions. In addition, iron oxide/propanediol (or butanediol) mesostructured materials with increased interlayer distances can also be synthesized. The developed synthetic strategy may be extended toward the creation of other ultrathin mesostructured nanosheets.
Co-reporter:Jian Yao Zheng, Xi Wang, Wei Li, Zongwei Cao, Hao Wang, Chuang Zhang, Wei-Guo Song, Ying Ma and Jiannian Yao
CrystEngComm 2012 vol. 14(Issue 22) pp:7616-7620
Publication Date(Web):17 Aug 2012
DOI:10.1039/C2CE25816A
Cubic nickel frames were fabricated through an etchant-assisted solution method. This procedure brought into play the synergetic effects of oriented attachment, Ostwald-ripening and facet-selective etching. The obtained products showed an excellent ability to remove heavy metal ions in water treatment. The peculiar structures of these frames make them potentially useful in many other applications.
Co-reporter:Yeteng Zhong, Xi Wang, Kecheng Jiang, Jian Yao Zheng, Yuguo Guo, Ying Ma and Jiannian Yao
Journal of Materials Chemistry A 2011 vol. 21(Issue 44) pp:17998-18002
Publication Date(Web):13 Oct 2011
DOI:10.1039/C1JM12765A
We report a facile route to synthesize Co3O4–C hybrid core-shell and hollow spheres with porous structures. Based on the results of the numerous characterization methods used, the ligand exchange etching mechanism is proposed to explain the formation of these two structures. Evaluated as an anode material in lithium-ion batteries (LIBs), both core-shell and hollow submicrospheres manifest excellent cycling performance. This feature may be attributed to the uniform distribution of amorphous carbon and structural characteristics of these submicrospheres. Moreover, the superior reversible capacity of the core-shell spheres is 825 mA h g−1 over 40 cycles (the theoretical capacity value: ∼890 mA h g−1), resulting from a higher void-space-utilizing rate and the right accommodation of the volume change during the charge process. Despite various reported methods, this novel strategy may provide new thoughts to prepare other hollow structured materials.
Co-reporter:Xi Wang;Xing-Long Wu;Yu-Guo Guo;Yeteng Zhong;Xinqiang Cao;Jiannian Yao
Advanced Functional Materials 2010 Volume 20( Issue 10) pp:1680-1686
Publication Date(Web):
DOI:10.1002/adfm.200902295
Abstract
Single-, double-, and triple-shelled hollow spheres assembled by Co3O4 nanosheets are successfully synthesized through a novel method. The possible formation mechanism of these novel structures was investigated using powder X-ray diffraction, scanning and transmission electron microscopies, Fourier transform IR, X-ray photoelectron spectroscopy, and thermogravimetric analysis. Both poly(vinylpyrrolidone) (PVP) soft templates and the formation of cobalt glycolate play key roles in the formation of these novel multishelled hollow structures. When tested as the anode material in lithium-ion batteries (LIBs), these multishelled microspheres exhibit excellent cycling performance, good rate capacity, and enhanced lithium storage capacity. This superior cyclic stability and capacity result from the synergetic effect of small diffusion lengths in the nanosheet building blocks and sufficient void space to buffer the volume expansion. This facile strategy may be extended to synthesize other transition metal oxide materials with hollow multishelled micro-/nanostrucutures, which may find application in sensors and catalysts due to their unique structural features.
Co-reporter:Zhongliang Wang, Ruili Zhang, Ying Ma, Li Zheng, Aidong Peng, Hongbing Fu and Jiannian Yao
Journal of Materials Chemistry A 2010 vol. 20(Issue 6) pp:1107-1111
Publication Date(Web):22 Dec 2009
DOI:10.1039/B905381F
Polyoxometalates (POMs) are promising photochromic materials, but flexible POM-based thin films sensitive to visible-light have not been reported so far. In this study, highly transparent flexible self-supporting phosphomolybdate(PMo12)–agarose thin films were successfully fabricated by the combination of hydrogel chemistry and a facile casting technique. It was identified that strong interaction between polyhydroxyl site of agarose and PMo12 by hydrogen bonds together with densely-packed 3D network structure in the gel state avoided the phase separation efficiently and resulted in the homogenous distribution of PMo12 as well as the good mechanical properties of the nanocomposite films. More importantly, the obtained thin films exhibited excellent visible-light photochromic performance. When exposed to blue light irradiation through a TEM copper grid as photomask, the image recorded on the film displayed good resolution at 2 μm scale. Therefore, the developed PMo12–agarose photochromic thin films are promising for applications in portable high-resolution displays and high-density memory devices.
Co-reporter:Zhongliang Wang, Ruili Zhang, Ying Ma, Aidong Peng, Hongbing Fu and Jiannian Yao
Journal of Materials Chemistry A 2010 vol. 20(Issue 2) pp:271-277
Publication Date(Web):05 Nov 2009
DOI:10.1039/B917739F
Europium-containing polyoxometalates (Eu-POMs) are widely used for the fabrication of hybrid inorganic-organic luminescent materials. A few efforts have been devoted to develop active Eu-POM-based luminescent sensors and switches. In this study, highly transparent flexible self-supporting decatungsteuropate(EuW10)-agarose thin films were successfully fabricated by a facile hydrogel casting technique. It was identified that strong interactions between agarose and EuW10 by hydrogen bonds at the hydroxyl sites and densely-packed 3D network structure of agarose in the gel state account for the homogenous distribution of EuW10 and good mechanical properties of the nanocomposite films. More importantly, the obtained thin films displayed strong red emission of Eu(III) ion, and the luminescence of these thin films was sensitive to the acid and base gases. When the thin films were exposed to HCl gas, their luminescence was sharply decreased, while the luminescence was recovered upon subsequently exposing the films to NH3 gas. Such process could be repeated many times and a portable switch based on these thin films was proposed.
Co-reporter:Yi Zeng, Xi Wang, Hao Wang, Yang Dong, Ying Ma and Jiannian Yao
Chemical Communications 2010 vol. 46(Issue 24) pp:4312-4314
Publication Date(Web):17 May 2010
DOI:10.1039/C0CC00706D
We report a simple hard template strategy to prepare multi-shelled titania hollow spheres, which showed enhanced photocatalytic activities in comparison with sphere-in-sphere structures and nanoparticles.
Co-reporter:Meng Zhang, Tianyou Zhai, Xi Wang, Ying Ma and Jiannian Yao
Crystal Growth & Design 2010 Volume 10(Issue 3) pp:1201-1206
Publication Date(Web):February 11, 2010
DOI:10.1021/cg901180e
At a low temperature of 550 °C, multiarmed CdS nanostructures were successfully prepared by thermal evaporation of CdS powders without use of any catalysts. The length and tip diameter of the arms in CdS multipods could be controlled by simply varying the growth time. With the arm length increasing, the tip diameter successively decreases. Short-armed multipods (SMPs) are made of both zinc blende and wurtzite phase CdS, while medium-armed multipods (MMPs) and long-armed multipods (LMPs) consist of only hexagonal phase CdS. LMPs exhibit good field-emission (FE) properties with relatively high field-enhancement factor and enhanced luminescence compared to SMPs and MMPs because of the needle-shaped arms and high crystallinity. Besides bind energy emission of CdS, LMPs exhibit a broad red emission in CL spectrum because of the arms with high aspect ratios.
Co-reporter:Tianyou Zhai, Xiaosheng Fang, Meiyong Liao, Xijin Xu, Liang Li, Baodan Liu, Yasuo Koide, Ying Ma, Jiannian Yao, Yoshio Bando and Dmitri Golberg
ACS Nano 2010 Volume 4(Issue 3) pp:1596
Publication Date(Web):February 10, 2010
DOI:10.1021/nn9012466
The synthesis of high-quality In2Se3 nanowire arrays via thermal evaporation method and the photoconductive characteristics of In2Se3 individual nanowires are first investigated. The electrical characterization of a single In2Se3 nanowire verifies an intrinsic n-type semiconductor behavior. These single-crystalline In2Se3 nanowires are then assembled in visible-light sensors which demonstrate a fast, reversible, and stable response. The high photosensitivity and quick photoresponse are attributed to the superior single-crystal quality and large surface-to-volume ratio resulting in fewer recombination barriers in nanostructures. These excellent performances clearly demonstrate the possibility of using In2Se3 nanowires in next-generation sensors and detectors for commercial, military, and space applications.Keywords: indium selenide; nanowire arrays; photodetector; semiconductor; sensor; thermal evaporation; visible light
Co-reporter:Zhongliang Wang;Ruili Zhang;Aidong Peng;Qing Liao;Zongwei Cao;Hongbing Fu;Jiannian Yao
Advanced Materials 2009 Volume 21( Issue 17) pp:1737-1741
Publication Date(Web):
DOI:10.1002/adma.200803321
Co-reporter:Xi Wang;Hongbing Fu;Aidong Peng;Tianyou Zhai;Fangli Yuan;Jiannian Yao
Advanced Materials 2009 Volume 21( Issue 16) pp:
Publication Date(Web):
DOI:10.1002/adma.200990051
Co-reporter:Xi Wang;Hongbing Fu;Aidong Peng;Tianyou Zhai;Fangli Yuan;Jiannian Yao
Advanced Materials 2009 Volume 21( Issue 16) pp:1636-1640
Publication Date(Web):
DOI:10.1002/adma.200801309
Co-reporter:Meng Zhang, Tianyou Zhai, Xi Wang, Qing Liao, Ying Ma, Jiannian Yao
Journal of Solid State Chemistry 2009 Volume 182(Issue 11) pp:3188-3194
Publication Date(Web):November 2009
DOI:10.1016/j.jssc.2009.08.028
CdS nanostructures with different morphologies and sizes were successfully fabricated through a facile and effective carbon-assisted thermal evaporation method. Through simply changing the positions of silicon substrates, the temperatures and the effects of carbon in different zones were modified, and thus the morphologies of CdS nanostructures were varied from multipods to nanobrushes to nanocups. These nanostructures were characterized by scanning electron microscopy (SEM), transmission electron microscopy (TEM), energy-dispersive X-ray spectrometry (EDS), X-ray powder diffraction (XRD) and Raman spectroscopy. Cathodoluminescence (CL) measurement shows that the as-grown CdS nanostructures display different luminescent properties. CdS multipods and nanocups show mainly green emission centered at ∼496 nm. However, nanobrushes exhibit predominant red emission band peaking at ∼711 nm. These interesting results show that carbon not only affected the growth process but also influenced the properties of CdS nanostructures.A facile and effective carbon-assisted thermal evaporation method is explored to synthesize CdS multipods, nanobrushes and nanocups. These CdS nanostructures display very different optical properties.
Co-reporter:Zhongliang Wang, Ying Ma, Ruili Zhang, Da Xu, Hongbing Fu, Jiannian Yao
Journal of Solid State Chemistry 2009 Volume 182(Issue 4) pp:983-988
Publication Date(Web):April 2009
DOI:10.1016/j.jssc.2009.01.014
A layered phosphovanadomolybdate/1,10-decanediamine (1,10-DAD) self-assembled ultrathin film was fabricated by means of alternating adsorption of mixed-addenda polyoxometalates (POMs) (phosphovanadomolybdate, H5[PMo10V2O40]) and 1,10-DAD, and its photochromic properties were investigated. It is found that the self-assembled multilayer (SAM) film shows high-photochromic response, excellent photochromic stability and reversibility. The photochromic behavior of the SAM is closely related to the reduction potentials of addenda atoms in mixed-addenda POMs. In the case of photo-reduced mixed-addenda POMs, the electron is localized on the more reducible atom, and the addenda atoms with higher reduction potentials show prior photochromism compared with those with lower reduction potentials. The coloration speed is improved after introduction of V into molybdenum POM. The well-ordered lamellar structure of the film was well maintained during the coloration.An ordered H5[PMo10V2O40]/1,10-decanediamine ultrathin film was fabricated by a self-assembled technique. The hybrid film displays good photochromism closely related to the reduction potentials of addenda atoms.
Co-reporter:Tianyou Zhai, Xiaosheng Fang, Yoshio Bando, Qing Liao, Xijin Xu, Haibo Zeng, Ying Ma, Jiannian Yao and Dmitri Golberg
ACS Nano 2009 Volume 3(Issue 4) pp:949
Publication Date(Web):March 23, 2009
DOI:10.1021/nn800895k
Highly ordered CdS nanostructure arrays were successfully fabricated via a simple two-step metal-organic chemical vapor deposition process. Both stimulated emission and field-emission measurements were carried out in an attempt to understand the correlation between the morphologies, alignments, and emission performances of five ordered CdS nanostructure array types (well-aligned truncated nanocones, nanorods, cleft nanorods, quasi-aligned nanowires, and nanowires). The 1D CdS nanostructures of various types displayed notable differences in stimulated and field-emission performances. The stimulated emission strongly correlated with the structure alignment: the better the alignment, the lower the threshold. Both of the alignments and aspect ratios greatly affected the field-emission properties; the CdS emitters of higher aspect ratio and better alignment exhibited better field-emission performance. Thus the well-aligned CdS nanorod arrays had the lower threshold for stimulated emission, and quasi-aligned nanowire arrays produced the higher field-emission current and possessed the lower turn-on fields.Keywords: arrays; CdS nanostructure; field emission; metal-organic chemical vapor deposition; morphology-tunable; semiconductor; stimulated emission
Co-reporter:Xi Wang, Lingjie Yu, Xing-Long Wu, Fangli Yuan, Yu-Guo Guo, Ying Ma and Jiannian Yao
The Journal of Physical Chemistry C 2009 Volume 113(Issue 35) pp:15553-15558
Publication Date(Web):August 12, 2009
DOI:10.1021/jp904652m
In this paper, single-crystalline Co3O4 hollow octahedral hollow cages with tunable surface aperture were synthesized by the carbon-assisted carbothermal method. On the basis of electron microscopic observation and structural analysis, all the following factors, including the precursor concentration, species of precursor, intrinsic crystal structure of products and carbon-assisted carbothermal reaction, play key roles in the formation of Co3O4 octahedral hollow structures. When the as-prepared Co3O4 samples were used as the anode materials in lithium ion batteries (LIBs), it was found that the octahedral hollow cages with large surface aperture performed better than both those with small surface aperture and Co3O4 nanoparticles, indicating that not only the single-crystalline robust structure but also the tunable surface aperture in the shell could affect the electrochemical property in LIBs.
Co-reporter:Tianyou Zhai, Yang Dong, Yaobing Wang, Zongwei Cao, Ying Ma, Hongbing Fu, Jiannian Yao
Journal of Solid State Chemistry 2008 Volume 181(Issue 4) pp:950-956
Publication Date(Web):April 2008
DOI:10.1016/j.jssc.2008.01.032
Single-crystalline tetrapod-like ZnS nanopods were synthesized by a one-step seed-epitaxial metal-organic chemical vapor deposition (MOCVD) approach using cubic CdSe nanocrystals as the seeds. The diameters of the ZnS tetrapods can be easily tuned by changing the distances between the substrates and precursors. A possible growth mechanism is discussed on the basis of the heterostructure epitaxial growth. The ZnS tetrapod has a zinc CdSe nanocrystal core at the center with four wurtzite ZnS arms growing out from the core along four [0001] directions. Due to the lower temperature and versatility, this controllable seed-epitaxial method has potential as a general means of forming complex branching structures and may also offer opportunities for applications as building blocks for optoelectronic devices.Single-crystalline tetrapod-like ZnS nanopods were synthesized by a one-step seed-epitaxial metal-organic chemical vapor deposition approach using cubic CdSe nanocrystals as the seeds. The diameters of the ZnS tetrapods can be easily tuned by changing the distances between the substrates and precursors.
Co-reporter:Yang Dong;Fugang Shen;Tianyou Zhai;Yi Zeng;Hongbing Fu;Jiannian Yao
Macromolecular Rapid Communications 2007 Volume 28(Issue 24) pp:2339-2345
Publication Date(Web):30 OCT 2007
DOI:10.1002/marc.200700483
Well-dispersed silver nanoparticles were successfully fabricated within poly[(N-isopropylacrylamide)-co-(acrylic acid)] [P(NIPAM-co-AA)] microgel particles which were synthesized with different cross-linking densities. Their structures were studied by field-emission scanning electron microscopy, transmission electron microscopy, UV-vis spectroscopy, X-ray diffraction and FT-IR spectroscopy. The interactions between the microgel particles and the incorporated silver nanoparticles were investigated by X-ray photoelectron spectroscopy. The results revealed that there was charge transfer from the carbonyl groups of the microgel particles to the silver nanoparticles. Moreover, as the diameter of the AgNPs decreases, the charge-transfer efficiency increases accordingly. The P(NIPAM-co-AA)/AgNPs hybrid microgel particles were thermoresponsive and their behavior completely reversible with several heating/cooling cycles.
Co-reporter:Bi-Fen Gao;Ya-An Cao;Zhan-Jun Gu;Guang-Jin Zhang;Jian-Nian Yao
Chinese Journal of Chemistry 2007 Volume 25(Issue 4) pp:
Publication Date(Web):5 APR 2007
DOI:10.1002/cjoc.200790091
A series of Ti1−xZrxO2 materials were synthesized through a multistep sol-gel process. The structural characteristics were investigated using X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS) and Raman measurements. The experimental results showed that a solid solution could be obtained at low Zr/(Ti+Zr) molar ratios (x≦0.319). Raman measurements exhibited that the presence of zirconium in the solid solutions greatly retarded the amorphous-anatase and anatase-rutile transitions. The diffuse reflectance UV-Vis spectra revealed that the bandgap of the solid solution was enlarged gradually with the increment of incorporated zirconium content. The Ti1−xZrxO2 solid solutions exhibited higher photocatalytic activity than pure TiO2 for the degradation of 4-chlorophenol aqueous solution.
Co-reporter:Zhongliang Wang, Ruili Zhang, Ying Ma, Aidong Peng, Hongbing Fu and Jiannian Yao
Journal of Materials Chemistry A 2010 - vol. 20(Issue 2) pp:NaN277-277
Publication Date(Web):2009/11/05
DOI:10.1039/B917739F
Europium-containing polyoxometalates (Eu-POMs) are widely used for the fabrication of hybrid inorganic-organic luminescent materials. A few efforts have been devoted to develop active Eu-POM-based luminescent sensors and switches. In this study, highly transparent flexible self-supporting decatungsteuropate(EuW10)-agarose thin films were successfully fabricated by a facile hydrogel casting technique. It was identified that strong interactions between agarose and EuW10 by hydrogen bonds at the hydroxyl sites and densely-packed 3D network structure of agarose in the gel state account for the homogenous distribution of EuW10 and good mechanical properties of the nanocomposite films. More importantly, the obtained thin films displayed strong red emission of Eu(III) ion, and the luminescence of these thin films was sensitive to the acid and base gases. When the thin films were exposed to HCl gas, their luminescence was sharply decreased, while the luminescence was recovered upon subsequently exposing the films to NH3 gas. Such process could be repeated many times and a portable switch based on these thin films was proposed.
Co-reporter:Yeteng Zhong, Xi Wang, Kecheng Jiang, Jian Yao Zheng, Yuguo Guo, Ying Ma and Jiannian Yao
Journal of Materials Chemistry A 2011 - vol. 21(Issue 44) pp:NaN18002-18002
Publication Date(Web):2011/10/13
DOI:10.1039/C1JM12765A
We report a facile route to synthesize Co3O4–C hybrid core-shell and hollow spheres with porous structures. Based on the results of the numerous characterization methods used, the ligand exchange etching mechanism is proposed to explain the formation of these two structures. Evaluated as an anode material in lithium-ion batteries (LIBs), both core-shell and hollow submicrospheres manifest excellent cycling performance. This feature may be attributed to the uniform distribution of amorphous carbon and structural characteristics of these submicrospheres. Moreover, the superior reversible capacity of the core-shell spheres is 825 mA h g−1 over 40 cycles (the theoretical capacity value: ∼890 mA h g−1), resulting from a higher void-space-utilizing rate and the right accommodation of the volume change during the charge process. Despite various reported methods, this novel strategy may provide new thoughts to prepare other hollow structured materials.
Co-reporter:Yeteng Zhong, Yijun Yang, Ying Ma and Jiannian Yao
Chemical Communications 2013 - vol. 49(Issue 88) pp:NaN10357-10357
Publication Date(Web):2013/06/26
DOI:10.1039/C3CC43673J
By using 1,5-pentanediol as a capping and structure directing agent, ultrathin Eu2O3 nanosheets (<1 nm) have been synthesized and assembled into a layered structure. The lateral dimensions of the nanosheets can be tuned by simply controlling the reaction time. These layered structures exhibit a strong quantum size effect due to the extremely small thickness of the assembled nanosheets.
Co-reporter:Yi Zeng, Xi Wang, Hao Wang, Yang Dong, Ying Ma and Jiannian Yao
Chemical Communications 2010 - vol. 46(Issue 24) pp:NaN4314-4314
Publication Date(Web):2010/05/17
DOI:10.1039/C0CC00706D
We report a simple hard template strategy to prepare multi-shelled titania hollow spheres, which showed enhanced photocatalytic activities in comparison with sphere-in-sphere structures and nanoparticles.
Co-reporter:Zhongliang Wang, Ruili Zhang, Ying Ma, Li Zheng, Aidong Peng, Hongbing Fu and Jiannian Yao
Journal of Materials Chemistry A 2010 - vol. 20(Issue 6) pp:NaN1111-1111
Publication Date(Web):2009/12/22
DOI:10.1039/B905381F
Polyoxometalates (POMs) are promising photochromic materials, but flexible POM-based thin films sensitive to visible-light have not been reported so far. In this study, highly transparent flexible self-supporting phosphomolybdate(PMo12)–agarose thin films were successfully fabricated by the combination of hydrogel chemistry and a facile casting technique. It was identified that strong interaction between polyhydroxyl site of agarose and PMo12 by hydrogen bonds together with densely-packed 3D network structure in the gel state avoided the phase separation efficiently and resulted in the homogenous distribution of PMo12 as well as the good mechanical properties of the nanocomposite films. More importantly, the obtained thin films exhibited excellent visible-light photochromic performance. When exposed to blue light irradiation through a TEM copper grid as photomask, the image recorded on the film displayed good resolution at 2 μm scale. Therefore, the developed PMo12–agarose photochromic thin films are promising for applications in portable high-resolution displays and high-density memory devices.
