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Nanophotonics, Nanoelectronics and Nanosensor, N3 2013

作者： Qu, Xiaoling Zhou, Jing Chen, Wen State Key Laboratory of Advanced Technology for Materials Synthesis and Progressing School of Materials Science and Engineering Wuhan University of Technology Wuhan 430070 P. R. China

Ca(Zn1/3Nb2/3)O3/CaTiO3 multilayer heterogeneous thin films have been prepared by sol-gel method. The films are confirmed to be perovskite phase with dense, uniform surface, which possess higher dielectric constant, e... 详细信息

ISBN: (纸本)9781557529763

关键词： Film preparation

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Shielding Effectiveness of Composites Containing Flaky Inclusions

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高电压技术 2013年第8期39卷 1995-1999页

作者： WANG Qingguo QU Zhaoming WANG Yilong Institute of Electrostatic & Electromagnetic Protection Mechanical Engineering College Shijiazhuang 050003 China State Key Laboratory of Advanced Technology for Materials Synthesis and Processing Wuhan University of Technology Wuhan 430070 China

To investigate the quantitative relationship between the electromagnetic-shielding property of composites and the distribution of inclusions, a scheme for predicting the shielding effectiveness of composites containing variously-distributed flaky inclusions is proposed. The scheme is based on equivalent parameters of homogeneous comparison materials and the plane-wave shielding theory. It leads to expli- cit formulas for the shielding effectiveness of multi-layered composites in terms of microstructural parameters that characterize the shape, distribution and orientation of the inclusions. For single layer composite that contains random and aligned flaky silver-coated carbonyl-iron particles with fractions of different volume, the predicted shielding effectiveness agrees well with the experimental data. As for composites containing aligned flaky particles,the shielding effectiveness obtained by the proposed scheme and experiment data is higher than that the random case, e.g. about 20 dB higher at 750 MHz. The proposed scheme is a straightforward method for optimizing future composite de- signs.

关键词：多层复合材料屏蔽效能夹杂物片状微观结构参数实验数据羰基铁粒子电磁屏蔽

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Back Cover: Hierarchical Pt/NiO Hollow Microspheres with Enhanced Catalytic Performance (ChemNanoMat 1/2015)

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ChemNanoMat 2015年第1期1卷

作者： Lifang Qi Bei Cheng Wingkei Ho Gang Liu Jiaguo Yu State Key Laboratory of Advanced Technology for Material Synthesis and Processing Wuhan University of Technology Luoshi Road 122 Wuhan 430070 P.R. China Department of Science and Environmental Studies and Centre for Education in Environmental Sustainability The Hong Kong Institute of Education Tai Po N.T. Hong Kong P.R. China National Center for Nanoscience and Technology Beijing 100190 P.R. China Department of Physics Faculty of Science King Abdulaziz University Jeddah 21589 Saudi Arabia

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Raw Ginger Composite Antioxidant with High Efficiency to Extract Vitamin C from Strawberry

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Advances in Chemical Engineering and Science 2013年第3期3卷 185-188页

作者： Yanhu Guo Yumin Zhang Dabing Luo Tao Ma State Key Lab of Advanced Technology for Materials’ Synthesis and Processing Wuhan University of Technology Wuhan China

Raw ginger was introduced to a series of composite antioxidants. The specimens performed better efficiency than ordinary antioxidants while extracting vitamin C from strawberry. The results suggested that, by employing raw ginger composite antioxidant, the reservation of vitamin C could be 91.63% in washing process and 76.68% in squeezing process respectively. Furthermore, in squeezing process, the reservation of vitamin C reached 84.78% while the concentrate of raw ginger antioxidant was 0.03%. The both deposits performed perfect synergy effectively. Raw ginger composite antioxidant could be the well agent to extract vitamin C from fruit.

关键词： Raw Ginger Composite Antioxidant Synergy Effective Strawberry Vitamin C

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Gas Sensing Properties of Ultralong MoO3 Nanobelts for Ethanol Gas

Gas Sensing Properties of Ultralong MoO3 Nanobelts for Ethan...

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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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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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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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Preparation and electric properties of Bi0.5Na 0.5TiO3-Bi(Al0.5Ga0.5)O3 lead-free piezoceramics

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Journal of the American Ceramic Society 2013年第12期96卷 3793-3797页

作者： Wang, Qi Chen, Jun Fan, Longlong Song, Huidong Gao, Wei Rong, Yangchun Liu, Laijun Fang, Liang Xing, Xianran Department of Physical Chemistry University of Science and Technology Beijing Beijing 100083 China University of Science and Technology Beijing Beijing 100083 China Key Laboratory of New Processing Technology for Nonferrous Metals and Materials Ministry of Education Guilin University of Technology Guilin 541004 China State Key Laboratory for Advanced Metals and Materials University of Science and Technology Beijing Beijing 100083 China

A new lead-free BNT-based piezoelectric ceramics of (1 - x)Bi 0.5Na0.5TiO3-xBi(Al0.5Ga 0.5)O3 (x = 0, 0.02, 0.03, 0.04, and 0.05) were synthesized using a conventional ceramic fabrication method. Their structures and electrical properties were investigated. All the samples show a typical ferroelectric P(E) loops and S(E) curves at room temperature. The optimal properties are obtained at the composition of the x = 0.03. The substitution of Bi(Al0.5Ga0.5)O3 enhances piezoelectric constant and increases Curie temperature from 58 pC/N and 310°C of pure BNT to 93 pC/N and 325°C of the x = 0.03. The temperature-dependent P(E) loops and S(E) curves of 0.97BNT-0.03BAG indicate that phase transition from ferroelectric to antiferroelectric takes place over a very wide temperature region from 80°C to 180°C. The results show that the introduction of BAG improves the electrical properties of BNT. © 2013 The American Ceramic Society.

关键词： Piezoelectric ceramics

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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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