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International Conference on Nanoscience & technology,China 2013(ChinaNANO 2013)

作者： Shuang Yang Yueli Liu Wei Jin Wen Chen Tingqiang Yang State Key Laboratory of Advanced Technology for Materials Synthesis and Processing and School of Materials Science and Engineering Wuhan University of Technology

As a layered-structure semiconductor material with wide band gap, MoO 3 has been considered to be a promising candidate for application in gas sensor. Recently, gas sensor based on MoO 3 have been found to have a response towards various gases such as H 2 S, NO 2 , NH 3 , trimethylamine, formaldehyde and H 2 in the temperature range of 300–600 °C. Although MoO 3 films and nanorods are not sensitive to ethanol gas, it is found that the ultralong MoO 3 nanobelts have a good sensitivity and selectivity to ethanol gas in our works. In the present work, the ultralong MoO 3 nanobelts are prepared by hydrothermal method using a molybdenum organic salt precursor. The nanobelts are flexible with an average length of 200-300μm and width of 500nm, which won’t be broken even after bended or distorted. The nanobelts are characterized by using X-ray diffraction (XRD), Field emission scanning electron microscopy (FESEM), transmission electron microscopy (TEM) and Raman spectra. Gas sensor based on ultralong and flexibility MoO 3 nanobelts is then fabricated. The sensor shows a good sensitivity towards ethanol gas, while almost no response towards other reducing gases, such as ammonia and formaldehyde in the temperature range of 220–380 ℃, the detection limit to ethanol gas may reach to 5ppm at the temperature of 380℃, which indicates that this kind of sensor has a promising future for ethanol detection. In conclusion, a gas sensor has been fabricated based on ultralong and flexibility MoO 3 nanobelts, which are prepared by hydrothermal method using a molybdenum organic salt precursor, and it is sensitive to ethanol gas. The reason for the good sensitivity to ethanol may be due to the large specific surface area, axial electron transfer and the non-stoichiometry of MoO 3 nanobelts.

关键词： Ultralong MoO 3 Nanobelts, Hydrothermal method, Gas Sensing Property, Ethanol gas

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Single-nanowire solar cells based on the surface-passivated CdS/Ag2S core-shell heterostructures

Single-nanowire solar cells based on the surface-passivated ...

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International Conference on Nanoscience & technology,China 2013(ChinaNANO 2013)

作者： Keqiang Chen Yueli Liu Zhuoyin Peng Yuqing Cheng Wen Chen State Key Laboratory of Advanced Technology for Materials Synthesis and Processing and School of Materials Science and Engineering Wuhan University of Technology

Single-nanowire solar cells have been considered to be the promising candidates as the nanoelectronical and flexibledevices, as they possess large surface-to-volume ratio and short minority carrier’stransferring path. Recently, there is some kinds of heterostructures are used to fabricated single-nanowire solar cells, such as CdS/Cu 2 S, CuInSe 2 /CdS. Among them, cadmium sulfide （CdS） and silver sulfide （Ag 2 S） have been attracted much attention for excellentoptoelectronic property, and surface-passivated is an important process to improve the efficiency. Till now, there is few works focused on the influence of the surface-passivated layer on the photovoltaicefficiency of the CdS/Ag 2 S core-shell single-nanowires solar cells. Herein, CdS nanowires were synthesized via vapor liquid solid（VLS） method, which is used as the core structure. To obtain CdS/Ag 2 S core-shell structure, cation exchange was carried out through mixing CdS solution with AgNO 3 solution.A ZnS passivation layer with the thickness of 0nm was achieved by chemical bath deposition （CBD） process. The single CdS/Ag 2 S core-shell nanowires were separated individually on the regular Au pattern fabricated by the photolithography technique, and then two ends of the nanowires were well contacted with Au electrodes by using the electron beam lithography. X-raydiffraction, SEM, X-ray spectroscopy and TEM techniques were used to character the microstructure, morphology and combining chemical state. The fabricated single-nanowire solar cells were irradiated under AM 1.5G illumination, an efficiency improvement from 1.8% to 2.4%was achieved due to the preventing charge carriers from reaching the surface by surface-passivated layer. In conclusion, CdS/Ag 2 Sheterostructures had been successfully prepared by cation exchange method, achieving an efficiency enhancement by forming the surface-passivated single-nanowire solar cells.

关键词： CdS/Ag 2 Sheterostructure cation exchange single-nanowire solar cells surface-passivated photovoltaicefficiency.

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Influcence of the TiO2 and Cu2S nanowire arrays served as the photo-anodes and photo-cathodes on the efficiency of quantum dots sensitized solar cells

Influcence of the TiO2 and Cu2S nanowire arrays served as th...

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International Conference on Nanoscience & technology,China 2013(ChinaNANO 2013)

作者： Zhuoyin Peng Yueli Liu Yinghan Zhao Keqiang Chen Yuqing Cheng Chen Wen State Key Laboratory of Advanced Technology for Materials Synthesis and Processing and School of Materials Science and Engineering Wuhan University of Technology

Quantum dots sensitized solar cells (QDSSCs) have been attracted much attention as the next generation photovoltaic devices, due to the size-effect, high absorption coefficient and multiple excitation generation of quantum dots (QDs). Recently, Mn-CdS/CdSe and CuInS 2 /Mn-CdS sensitized solar cells has been obtained. However, the performance of the solar cells is still limited by the transfer barrier of the photo-induced electrons from nanoparticles. Nowadays, the single crystalline nanorods, nanowires and nanotubes arrays structure have been widely prepared to improve the electron transfer. In order to effectively enhance the efficiency, the nanowire structure is expected to be employed in both photo-anodes and counter electrodes for QDSSCs fabrication. In this work, Cu 2 S nanowire arrays are prepared by the solution method, which are employed to the photo-cathodes of solar cells, meanwhile, single crystalline anatase TiO 2 nanowires arrays are prepared by hydrothermal method and then be transferred to FTO substrate as the photo-anodes. CuInS 2 and Mn-CdS QDs are deposited on TiO 2 nanowire arrays films by using linking assembly method and chemical bath deposition. The structure, morphology and optical properties have been characterized by XRD, SEM, UV-Vis spectra. Under a solar illumination, the photovoltaic efficiency of this double-side nanowire structure based solar cells are obviously enhanced from 3.3% to 4.1%. In summary, the CuInS 2 /Mn-CdS QDs sensitized solar cells by using TiO 2 and Cu 2 S nanowire arrays as the photo-anodes and photo-cathodes have been fabricated. It is found that the photovoltaic performance of these QDSSCs is obviously enhanced comparing to the nanoparticles based solar cells. The reason is originated from that fact that the better electron transfer and injection from the one-dimensional nanowire arrays structure.

关键词： Anatase TiO 2 nanowire arrays, CuInS 2 /Mn-CdS quantum dots co-sensitized solar cells, Cu 2 S nanowire arrays counter electrodes, efficiency enhancement

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Photodegradation of Gaseous Benzene by V2O5 Modified TiO2 Nanotube Arrays Catalysts

Photodegradation of Gaseous Benzene by V2O5 Modified TiO2 Na...

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1st Euro-Asia Zeolite Conference

作者： Chunxia Zhao Xiaoyu Li Wen Chen Xiaofang Wu Jinqiao Cao State Key Laboratory of Advanced Technology for Materials Synthesis and Processing School of Materials Science and EngineeringWuhan University of Technology

Indoor air quality has received immense ***,a carcinogenicity material,is a typical gaseous indoor *** oxidation has been studied extensively to purify the polluted air and to remove *** has been the most popular photocatalyst for environmental purification due to its good chemical stability,high oxidized activity, nontoxicity and low ***,its quantum efficiency in photocatalyst reaction is generally not high enough from application point of *** this work,novel TiO nanotube arrays modified with

关键词： TiO Photodegradation of Gaseous Benzene by V2O5 Modified TiO2 Nanotube Arrays Catalysts

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Photocatalytic Properties of Hierarchical and Nanoporous Titania Hollow Microspheres

Photocatalytic Properties of Hierarchical and Nanoporous Tit...

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International Conference on Nanoscience & technology,China 2013(ChinaNANO 2013)

作者： Chao Zhang Jie Yang Yueli Liu Wen Chen State Key Laboratory of Advanced Technology for Materials Synthesis and Processing and School of Materials Science and Engineering Wuhan University of Technology

TiO 2 hollow structure materials had become one of the hot spots because of their low density, high specific surface areas, and good photocatalytic activity. Till now, there were lots of works focused on them, such as their extensive application in catalysis, pharmacy, sensing device, photon transmission and the basis material of DSSC. Nevertheless, the drawbacks which are out control of nanoparticles phases on the surface, raw materials wasted and visible region absorption of its structure doesn't make it get better development in the field of photocatalysis research. In the present work, sulfonated-polystyrene latex particles with the diameter varying from 500～700 nm were prepared by emulsifier-free emulsion polymerization using KPS as the anionic initiator, which was used as the template to synthesize porous titania microspheres with tunable shell thickness and void volume with the calcination at 400°*** coating reaction was processed in the mixed solvent of ethanol and acetonitrile at room temperature by hydrolyzing TBOT in the presence of ammonia. The thickness of titania shells could be controlled by varying the concentration contents of titanium tetrabutoxide (TBOT) in the ethanol/acetonitrile mixed solvents with an appropriate volume ratio (3:1). The titania shell was composed of tiny nanoparticles with a size range from 10～15 nm. The XRD analysis indicated that the calcinations temperature promoted the phase transformation of amorphous titania to an anatase TiO 2 phase, and then to rutile TiO 2 phase. To investigate the absorption properties of the TiO 2 hollow spheres, the UV–visible spectra of the TiO 2 hollow spheres were also measured, it was found that the prepared hollow sphere showed a stronger absorption in the UV-visible region than that of the P25 with a slight peak-shift towards longer wavelength, which may lead to the enhanced photocatalytic activity of tinatia hollow spheres by 53% if compared with P25 powders. In summary, hierarchical and na

关键词： TiO 2 hollow spheres, Template method, Photocatalytic property, Benzene gas

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The study of artificial xenon arc lamp ageing on E-glass/vinyl ester composites

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Fuhe Cailiao Xuebao/Acta Materiae Compositae Sinica 2013年第SUPPL.期30卷 33-39页

作者： Ni, Aiqing Zhang, Lifeng Ji, Yundong Wang, Jihui State Key Laboratory of Advanced Technology for Material Synthesis and Processing Wuhan University of Technology Wuhan 430070 China Department of Materials Science and Engineering Wuhan University of Technology Wuhan 430070 China

The effects of artificial xenon arc lamp ageing on E-glass/vinyl ester composite were investigated. The mechanical properties of the composite are investigated by static mechanical tests, the storage and loss moduli, Tg, the peak of tanδ by DMA, the peak location and peak intensity by FTIR for pure resin and the composite, and fracture development and the relationship between fracture density and fatigue stress level by SEM, respectively. It is found out that the most significant ageing factor is ultraviolet radiation, and that the introduction of glass fiber will accelerate the crosslink and degradation of resin.

关键词： Glass fibers

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Facile and Scalable synthesis of Graphene by Direct Transformation of Amorphous Carbide

Facile and Scalable Synthesis of Graphene by Direct Transfor...

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IUPAC 9th International Conference on Novel materials and their synthesis(NMS-IX) & 23rd International Symposium on Fine Chemistry and Functional Polymers(FCFP-XXIII)(IUPAC第九届新型材料和合成国际会议暨第23届国际精细化工和功能聚合物研讨会)

作者： Tao Peng Shichun Mu State Key Laboratory of Advanced Technology for Materials Synthesis and Processing Wuhan University of Technology Wuhan 430070 China

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POROUS GRAPHENE ELECTRODES FOR PEM FUEL CELLS

POROUS GRAPHENE ELECTRODES FOR PEM FUEL CELLS

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第五届世界氢能技术大会(WHTC2013)

作者： Kun Cheng Daping He Tao Peng Haifeng Lv Mu Pan Shichun Mu State Key Laboratory of Advanced Technology for Materials Synthesis and Processing Wuhan University of Technology Wuhan 430070China

As an air-pollution-free and high efficient power generating device,proton exchange membrane fuel cell (PEMFC) has attracted a wide *** of the key components of PEMFC is catalyst,during while the support materials pla... 详细信息

关键词： Proton exchange membrane fuel cell graphene pore mass diffusion catalyst

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Electrochemical Nanowire Devices for Energy Storage

Electrochemical Nanowire Devices for Energy Storage

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International Conference on Nanoscience & technology,China 2013(ChinaNANO 2013)

作者： Liqiang Mai Chaojiang Niu Xiaocong Tian Xu Xu Qinyou An Qiulong Wei Yunlong Zhao State Key Laboratory of Advanced Technology for Materials Synthesis and Processing WUT-Harvard Joint Nano Key Laboratory Wuhan University of Technology

One-dimensional nanomaterialshave attracted significant attention for a wide range of energy-related applications due to such unique advantages as short Li-ion insertion/extraction distance, facile strain relaxation upon electrochemical cycling, enhanced electron transport, and very large surface to volume ratio. We designed the single nanowire electrode devices as a unique platform for in situ probing the direct relationship between electrical transport, structure, and electrochemical properties of the single nanowire electrode to understand intrinsic reason of capacity fading. It demonstrates that during the electrochemical reaction conductivity of the nanowire electrode decreased, which limits the cycle life of the devices. Then, the prelithiation and Langmuir-Blodgett technique have been used to improve the cycling stability of nanowire electrode. Recently, we have synthesized SVO/PANI triaxial nanowires and fabricated hierarchical MnMoO 4 /CoMoO 4 heterostructured nanowires by combining "oriented attachment" and "self-assembly". The asymmetric supercapacitors based on the hierarchical heterostructured nanowires showed a high specific capacitance and good reversibility with a cycling efficiency of 98% after 1,000 cycles. Furthermore, we fabricated Li-air battery based on hierarchical mesoporous LSCO nanowires and nonaqueous electrolytes, which exhibits ultrahigh capacity over 11000 mAh g –1 , with the improvement of one order of magnitude than LSCO nanoparticles. We also designed and synthesized novel cucumber-like MnO 2 nanoparticles-enriched V 2 O 5 /PEDOT coaxial nanowires by layer-by-layer assembly with enhanced electrochemical performance. Recently we designed a nanoscroll buffered hybrid nanostructural VO 2 (B) composed of nanobelts and nanowires with greatly improved cycle life and rate capability. It is expected that our study may extend effective and helpful methods in directions that will solve the challenge of property degradation in energy storage an

关键词： nanowire devices, lithium batteries, energy storage

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Nanosphere Cathode materials with Three-dimensional Continuous Electron Pathways for Long-life and High-rate Lithium Storage

Nanosphere Cathode Materials with Three-dimensional Continuo...

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International Conference on Nanoscience & technology,China 2013(ChinaNANO 2013)

作者： Yifan Dong Shuo Li Liqiang Mai State Key Laboratory of Advanced Technology for Materials Synthesis and Processing WUT-Harvard Joint Nano Key Laboratory Wuhan University of Technology

Lithium-ion batteries （LIBs） are receiving considerable attention as storage devices in the renewable and sustainable energy developments. However, facile fabrication of long-life and high-rate cathode materials for LIBs is required to facilitate practical application. Among the candidate materials for high power LIBs, sodium super ionic conductor （NASICON） structured polyanion-based orthophosphate Li 3 V 2 （PO 4 ） 3 exhibits high energy and power density, and has been regarded as a prospective alternative cathode material in high power facilities such as electric vehicles, hybrid electric vehicles, and other power-supply equipment. Nevertheless, Li 3 V 2 （PO 4 ） 3 still faces some challenges such as low electronic conductivity and capacity fading during cycling. Here we propose a rationally controllable synthesis of highly crystalline Li 3 V 2 （PO 4 ） 3 nanospheres with a uniform carbon coating layer to restrain structure degradation during cycling. Additionally, acetylene black was used as the reducing agent and the template for particle growth, as well as a three-dimensional conductive and flexible network to provide a continuous electron pathway in the electrode. The uniform carbon layer and the conductive carbon network have a synergetic effect to enhance not only the cycling stability but also rate performance of Li 3 V 2 （PO 4 ） 3 in the application for LIBs. The as-prepared cathode material has a discharge capacity of 142 mA h g -1 at 1 C rate, approaching its theoretical value （150 mA h g -1 ）, and can even be cycled at a rate as high as 30 C without capacity fading. After 1000 cycles at a rate of 5 C, the as-prepared material has capacity retention of up to 83%, and can also tolerate 5000 cycles with a considerable capacity, demonstrating excellent cycling stability. Our work shows that this material has great potential for high-energy and high-power energy storage applications, and this rational method can be applied to synthesizing high-performance catho

关键词： lithium batteries energy storage long-life high-rate

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