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gas sensitivity of Poly (3, 4-ethylene dioxythiophene) Prepared by a Modified LB Film Method

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Journal of Wuhan University of Technology(Materials Science) 2011年第1期26卷 70-74页

作者：郑华靖 State Key Laboratory of Electronic Thin Films Integrated Devices School of Optoelectronic Information University of Electronic Science and Technology of China

An arachidic acid/poly （3, 4-ethylene dioxythiophene）（AA/PEDOT） multilayer Langmuir-Blodgett （LB） film was prepared by a modified LB film method. The theories were utilized to explain the effects between HCl molecule and LB film. The gas sensitivity mechanism of poly （3, 4-ethylene dioxythiophene）（PEDOT） multilayer film can be explained by the charge transfer between p system of PEDOT and oxidization HCl system. The gas sensitivity of PEDOT LB film deposited interdigital electrode to HCl was tested. The results showed that film thickness, treating temperature, deposition speed had different influence on film gas sensitivity. The AA/PEDOT film deposited device exhibited nonlinear behavior to HCl gas at lower concentration （20-60 ppm） and linear response behavior at higher gas concentration was observed. The time of the compound LB film of the AA/PEDOT responding to the 30 ppm HCl gas is about 20 seconds, which is far quicker than the time of the film to the PEDOTPRESS film（about 80 seconds）. It is not higher film press to better film. When the film press attains 45 mNs/m, the sensitivity of the AA/PEDOT film on the contrary descends.

关键词： poly （3 4-ethylene dioxythiophene）（PEDOT） Langmuir-Blodgett （LB） film method gas sensitivity measurement

Synthesis of organic semiconductor hexadecachloro zinc phthalocyanine and its gas sensitivity

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Journal of Semiconductors 2009年第3期30卷 78-82页

作者：施云波雷廷平李赞修德斌赵文杰冯侨华王立权 Mechanical Engineering Center for Post-doctoral Studies Harbin Engineering University School of Measurement Control Tech & Communications Engineering Harbin University of Science and Technology School of Applied Sciences Harbin University of Science and Technology School of Life Science and Chemistry Harbin University

Due to the difficulty in synthesizing perhalogenated metallophthalocyanine, the method of ammonium molybdate solid phase catalysis was introduced, and by using tetrachlorophthalic anhydride and urea as the raw materials, hexadecachloro zinc phthalocyanine （ZnPcCl16） was synthesized. Components of the composite were analyzed by energy spectrum, and its functional group structures and absorption peaks were characterized by IR and UV-vis spectroscopy. The thin films of gas sensors were prepared in a vacuum evaporation system and evaporated onto SiO2 substrates, where sensing electrodes were made by MEMS micromachining. The optimal conditions for the films are： substrate temperature of 150 ℃ evaporation current of 95 A and film thickness of 50 nm. The result showed that the sensors were ideally sensitive to Cl2 gas and could detect the minimum concentration of 0.3 ppm.

关键词： hexadecachloro zinc phthalocyanine organic semiconductor gas sensitivity

Microwave-assisted hydrothermal synthesis and gas sensitivity of nanostructured SnO_2

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Particuology 2013年第2期11卷 242-248页

作者： Liying Man Jun Zhang Jieqiang Wang Hongyan Xu Bingqiang Cao School of Materials Science and Engineering University of Jinan

Precursors for nanostructured SnO2 were synthesized via a microwave-assisted hydrothermal method under different conditions, using SnCI2.2H2 O, urea and citric acid as reactants. After calcination of the pre-cursors at 700 ℃ for 2 h, nanostructured SnO2 with different morphologies were obtained, and were then characterized using X-ray powder diffraction （XRD）, and field-emission scanning electron microscopy （FESEM）. The results show that synthesis temperature and time play an important role in the formation of the 3D hierarchical morphology of the nanostructured SnO2. gas sensing experiments demonstrate that the synthesized SnO2 materials, especially those with a 3D network structure, exhibit superb sensitivity to alcohol vaoors at 240 ℃.

关键词： Microwave-assisted hydrothermal gas sensitivity Hierarchical Self-assemble

A First-principles Study on gas sensitivity of Pd or Pt Loaded(5,5)Carbon Nanotube with a Di-vacancy Defect to CO and NO

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Chinese Journal of Structural Chemistry 2020年第10期39卷 1747-1752,1741页

作者：邱凯李磊范红伟卫河转安胜利贾桂霄 School of Materials and Metallurgy Inner Mongolia University ofScience and TechnologyBaotou 014010China Key Laboratory of New Functional Ceramics and Devices of Inner Mongolia Autonomous Region Baotou 014010China

Binding energies and geometrical and electronic structures for adsorptions of CO and NO on metal M(Pd or Pt)loaded or M and di-vacancy co-decorated(5,5)single-walled carbon nanotubes(M-CNTs or M-V2-CNTs)are studied using a GGA-PBE method in the work.The calculated results show that the di-vacancy defect in a perfect(5,5)tube opens the band gap,makes the(5,5)tube transform from a conductor into a semiconductor,and strengthens the adsorption of metal M on the(5,5)tube.For the adsorptions of CO and NO on M-CNT and M-V2-CNT,the CO and NO molecules can be both chemically adsorbed on loaded Pd or Pt atoms due to their active adsorption sites.NO is easily adsorbed on M-V2-CNT because of its electron configuration with a high 2p energy level and its adsorption significantly changes the band gap of M-V2-CNT and makes M-V2-CNT transform from a semiconductor to a conductor.However,the adsorption of CO can not cause the conductivity of M-V2-CNT change.M-V2-CNT has a good sensitivity to the NO gas,suitable as a sensor for detecting the NO gas molecule.In addition,the existence of di-vacancy defect decreases the interaction between CO or NO and Pt-CNT,which will contribute to the desorption of CO and NO gases.The work is expected to provide a theoretical basis for designing NO sensing devices.

关键词： gas sensitivity carbon nanotubes first principle di-vacancy electronic structures

The Study on the gas sensitivity of the One-Dimensional ZnO

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稀有金属材料与工程 2006年第A3期35卷 170-172页

作者： Qun Xiang Rongli Liu Liyi Shi Zhiyin Ni Qingyi Pan Department of Chemistry Shanghai University Shanghai 200444 China

One-dimensional (1D) ZnO was prepared through hydrothermal synthesis by cetyltrimethylammonium bromide (CTAB) controling its morphology.The products were characterized by X-ray diffraction (XRD),transmission electron microscopy (TEM) and scanning electron microscopy (SEM).The sintered gas sensor was prepared using ZnO nanorods and its gas sensitivity was measured in static gas atmosphere.The result showed that the ZnO nanorods had lower working temperature than granulated ZnO and had very good sensitivity to 10μg/g trimethylamine (TMA),methanol,ammonia, acetone and ethanol at the working temperature of 170℃.SEM picture revealed that there were many multi-pores in the surface of the sensors.These multi-pores might help to absorb gases and improve the gas sensitivity.

关键词： gas sensitivity one-dimensional Zn hydrothermal synthesis

The gas sensitivity of Polypyrrole Film Fabricated by in Situ Polymerization

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复旦学报（自然科学版） 2007年第5期46卷 789-页

作者： Chen Yousi, Li Yang, Yang Mujie(Department of polymer science and engineering, Zhejiang University, Hangzhou 310027, China) Department of polymer science and engineering Zhejiang University Hangzhou 310027

1 Results Polypyrrole (PPy) is a typical conducting polymer with high conductivity and good stability,and has been widely used for detection of gases including ammonia and nitroxide[1].However the reversiblity and selectivity of the response to these gases are always not satisfying.In the paper,conductive PPy film was deposited on the interdigital electrode modified by one bilayer of poly(diallyldimethylammonium chloride) and poly(sodium styrenesulfonate),by in-situ polymerization with FeCl3 as oxidizin...

关键词： conductive polymer polypyrrole gas sensitivity ammonia

Thin Film Nanocomposites for gas Sensors

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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 investigated.Electrical properties and gas sensitivity of nanocomposites were studied.It Was determined that the grain size of polycrystals depends on the film composition and can run down to 10 nm.It 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

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） techniques.The 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 solution.The responses of Cr doped α-Fe2O3 sensors were studied towards reducing gases such as ethanol,methanol,acetone,gasoline and n-hexane.gas 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

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