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Thin Film Nanocomposites for gas Sensors

稀有金属材料与工程 2006年第A3期35卷 33-35页

作者： E.S.Rembeza S.I.Rembeza B.M.Sinelnikov T.V.Svistova E.P.Domashevskaya Voronezh State University University sq.1394006 VoronezhRussia Voronezh State Technical University Moscow av.14394026 VoronezhRussia North Caucasian State Technical University Kulakov av.2355029 StavropolRussia

Nanocomposites on the base of thin films SnO_2 with additives of metal oxides such as SiO_2,ZrO_2,MnO_2 and others,were prepared by reactive ion-beam sputtering of metal target in the ambient of O_2+At,and then thermal treated at 500℃.Atomic composition and morphology of thin film nanocomposites were *** properties and gas sensitivity of nanocomposites were *** Was determined that the grain size of polycrystals depends on the film composition and can run down to 10 *** was found that temperature of maximal gas sensitivity of the films depends on their composition as well and it can be decreased by 100℃～150℃lower than temperature of maximal sensitivity of undoped films SnO_2.

关键词： nanocomposites metal oxides morphology electrical-physical properties gas sensitivity

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Shape Controlled Preparation,Characterization and gas Sensitivities of Shuttle-like Cr-doped α-Fe_2O_3 Nanoparticles

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Chemical Research in Chinese Universities 2012年第4期28卷 567-571页

作者： SI Shu-feng MING Zheng-qiu XING Guo-wen YAN Xi Department of Chemistry Beijing Normal UniversityBeijing 100875P.R.China

α-Fe2O3 nanoparticles doped with various molar fractions of Cr^3＋ were synthesized by a forced hydrolysis route and were characterized by X-ray diffraction（XRD）,scanning electronic microscopy（SEM）,X-ray photoelectron spectroscopy（XPS） and inductive coupled plasma（ICP） *** particles reserve shuttle-like shape in the presence of Cr^3＋.The crystallite sizes of Fe2O3 become smaller with the increased Cr^3＋ concentration in *** responses of Cr doped α-Fe2O3 sensors were studied towards reducing gases such as ethanol,methanol,acetone,gasoline and *** sensors based on these materials have higher sensitivities and rapid response/recovery time to alcohol than to hydrocarbon.

关键词： gas sensitivity Cr doped α-ironic oxide Forced hydrolysis

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Hydrothermal growth of symmetrical ZnO nanorod arrays on nanosheets for gas sensing applications

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Frontiers of Materials Science 2017年第3期11卷 271-275页

作者： Wenyan ZHAO Chuanjin TIAN Zhipeng XIE Changan WANG Wuyou FU Haibin YANG School of Materials Science and Engineering Jingdezhen Ceramic Institute Jingdezhen 333403 China State Key Laboratory of New Ceramics and Fine Processing School of Materials Science and Engineering Tsinghua University Beijing 100084 China State Key Laboratory of Superhard Materials Jilin University Changchun 130012 China

The hierarchical ZnO nanostructures with 2-fold symmetrical nanorod arrays on zinc aluminum carbonate （ZnAl-CO3） nanosheets have been successfully synthesized through a two-step hydrothermal process. The primary nanosheets, which serve as the lattice-matched substrate for the self-assembly nanorod arrays at the second-step of the hydrothermal route, have been synthesized by using a template of anodic aluminum oxide （AAO）. The as-prepared samples were characterized by XRD, FESEM, TEM and SAED. The nanorods have a diameter of about 100 nm and a length of about 2μ m. A growth mechanism was proposed according to the experimental results. The gas sensor fabricated from ZnO nanorod arrays showed a high sensitivity to ethanol at 230℃. In addition, the response mechanism of the sensors has also been discussed according to the transient response of the gas sensors.

关键词： ZnO nanorods hydrothermal growth gas sensitivity

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Synthesis of Al doped ZnO with a novel rice microstructure by hydrothermal processand analysis of their gas sensing properties

Synthesis of Al doped ZnO with a novel rice microstructure b...

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2014中国功能材料科技与产业高层论坛

作者： LI ZAN QIN WEI WU XIAOHONG School of Science Harbin Institute of Technology School of Science Harbin University School of Materials Science and Engineering Harbin Institute of Technology

ISBN: (纸本)9783038353522

Al-doped ZnO(AZO)powers with a novel rice-like morphology have been successfully synthesized through a simple and efficient hydrothermal approach,the products have been characterized by Xray diffraction(XRD),scanning electron microscopy(SEM)with an energy-dispersive X-ray analyzer and transmission electron microscopy(TEM).It showed that all the samples presented an hexagonal wurtzite structure of high crystallinity,and the microstructure was composed of numerous ***,the heater gas sensors were fabricated and an investigation of gas sensing properties has been *** sensors showed good selectivity to ethanol comparing with NH3,SO

关键词： Al-doped ZnO hydrothermal method morphology gas sensitivity

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The Photovoltage-gas Sensitive Properties of 7,7,8,8-Tetracyanoquinodimethane(TCNQ)

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Chemical Research in Chinese Universities 1990年第4期6卷 341-345页

作者： Jiang Lei, Wang Dejun, Liu Wang, Chai Xiangdong and Li Tiejin (Department of Chemistry, Jilin University, Changchun)

In this paper, surface photovoltage technique (SPV) was applied to the study of photovoltaic and gas sensitive properties of TCNQ polycrystal. It was found that SPV shows two peaks at 390 nm(P1) and 480 nm (P2) in the ultraviolet-visible range. And they are opposite in phase. The results of gaseous adsorption confirm that P, shows the acceptor characteristics, while PI shows that of donor. During adsorption, donor gas interacts with conjugated II * orbital, acceptor gas with the terminal group C=N .

关键词： Surface photovoltage gas sensitivity Adsorption

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