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Hierarchical Radial Co3O4 Microcrystal and Application in gas sensor

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Chinese Journal of Chemical Physics 2014年第1期27卷 99-102,I0004页

作者：于欣欣刘先松吴明在孙兆奇李广陈效双安徽大学物理与材料科学学院合肥230039 中国科学院上海技术物理研究所上海200083

Three-dimensional （3D） hierarchical Co3O4 microcrystal with radial dendritic morphologies was prepared through hydrothermal reactions followed by subsequent annealing treatment. Structural and morphological characterizations were performed by X-ray diffraction, scan-ning electron microscopy and transmission electron microscopy. The gas sensing properties of the as-obtained microcrystal were investigated at 110 oC, which revealed that the 3D hierarchical porous Co3O4 microcrystal exhibited high sensitivity to ammonia, as well as a short response time of 10 s. The response characteristic indicates that the sensor has a good stability and reversibility. Detections of toxic and flammable gases, such as ethanol, acetone and benzene were also carried out at a relative low temperature. The results indicate that such hierarchical Co3O4 microcrystal would be a potential material in the field of gas sensing.

关键词： Co3O4 Hierarchical gas sensor Sensitivity

High-sensitivity formaldehyde gas sensor based on Ce-doped urchin-like SnO_(2) nanowires derived from calcination of Sn-MOFs

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Frontiers of Materials Science 2024年第1期18卷 29-43页

作者： Wei Xiao Wei Yang Shantang Liu Hubei Key Lab of Novel Reactor&Green Chemical Technology School of Chemistry and Environmental EngineeringWuhan Institute of TechnologyWuhan 430073China Hubei Key Laboratory of Wudang Local Chinese Medicine Research Department of ChemistrySchool of Pharmaceutical SciencesHubei University of MedicineShiyan 442000China

Metal-organic frameworks(MOFs)have attracted widespread attention due to their regular structures,multiple material centers,and various *** are always considered as one kind of ideal templates for developing highly sensitive and selective gas *** this study,the advantages of MOFs with the high specific surface area(71.9891 m^(2)·g^(-1))and uniform morphology were fully utilized,and urchin-like SnO_(2) nanowires were obtained by the hydrothermal method followed by the calcination using Sn-MOFs consisting of the ligand of C_(9)H_(6)O_(6)(H_(3)BTC)and Sn/Ce center ions as sacrificial *** unique urchin-like nanowire structure facilitated gas diffusion and adsorption,resulting in superior gas sensitivity.A series of Ce-doped SnO_(2) nanowires with different doping ratios were synthesized,and their gas sensing properties towards formaldehyde were *** resulted Ce-SnO_(2) was revealed to have high sensitivity(201.2 at 250℃),rapid response(4 s),long-term stability,and good repeatability for formaldehyde sensing,and the gas sensing mechanism of Ce-SnO_(2) exposed to formaldehyde was also systematically discussed.

关键词： Ce-SnO_(2) SnO_(2) gas sensor formaldehyde Sn-MOF

Integrated gas sensor Based on MEMS

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稀有金属材料与工程 2006年第A3期35卷 173-175页

作者： Hongquan Zhang Tong Zhang Likai Sun Yunbo Shi Jianying Guo Harbin University of Science and Technology Harbin 150080 China Automobile Electronic Engineering Technology Research and Development Center Harbin 150001 China Northeast Transducer Technology Research Institute Harbin 150001 China

Integrated gas sensor suspending bridge style micro-structure has been developed on Al_2O_3 new type membrane based on ***_4 gas sensing unit and CO gas sensing unit were fabricated separately on 4 unit array style suspending bridge *** have studied on time-sequence modulation form voltage pulse heating method which forms different work temperature

关键词： Al2O3 membrane micro-structure gas sensor

A high-sensitivity H2S gas sensor based on optimized ZnO-ZnS nano-heterojunction sensing material

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Chinese Chemical Letters 2020年第8期31卷 2050-2054页

作者： Pei Ding Dongsheng Xu Nan Dong Ying Chen Pengcheng Xu Dan Zheng Xinxin Li School of Chemical and Environmental Engineering Shanghai Institute of TechnologyShanghai 201418China State Key Lab of Transducer Technology Shanghai Institute of Microsystem and Information TechnologyChinese Academy of SciencesShanghai 200050China

This paper reports a high-performance H2S gas sensing material that is made of ZnO nanowires(NWs)modified by an optimal amount of ZnS to form nano-hete *** with the intrinsic ZnONWs,the three differently modified nano-heterostructure material ZnO-ZnS-x(x=5,10,15)shows significant improvement in sensing performance to H2S at the working temperatures of 100-400℃,especially in the low temperature range(sensor with ZnO-ZnS-10 sensingmaterial exhibits the largest response signal to H2S among all the other ZnO-ZnS-x(x=5,10,15,20)*** response signal to 5 ppm H2S at 150℃is about 2.7 times to that of the ZnO-NWs ***,the ZnO-ZnS-10 sensor also features satisfactory selectivity and repeatability at 150℃.With the technical advantage attributed to the reduction of the redesigned band gap at the interface between ZnO and ZnS,the ZnO-ZnS hete ro structure sensor rather than the traditional ZnO-NWs sensor can be used for high-sensitivity application at low working temperature.

关键词： ZnO-ZnS heterojunction Hydrogen sulfide gas sensor Sensitivity detection Selectivity Band gap

H2S gas sensor based on integrated resonant dual-microcantilevers with high sensitivity and identification capability

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Chinese Chemical Letters 2020年第8期31卷 2155-2158页

作者： Lei Tang Pengcheng Xu Ming Li Haitao Yu Xinxin Li College of Life and Environmental Sciences Shanghai Normal UniversityShanghai 200234China State Key Lab of Transducer Technology Shanghai Institute of Microsystem and Information TechnologyChinese Academy of SciencesShanghai 200050China

Detection of trace-level hydrogen sulfide(H2 S)gas is of great importance whether in industrial production or disease *** research presents a novel H2 S gas sensor based on integrated resonant dual-microcantilevers which can identify and detect trace-level H2 S in *** sensor consists of two integrated resonant microcantilever sensors with different *** cantilever sensor can identify H2 S by outputting positive frequency shift signals,while the other cantilever sensor will detect H2 S as a normally used cantilever sensor with negative frequency *** the two cantilever sensors,the proposed gas sensor can distinguish H2 S from a variety of common gases,and the detection limit to H2 S of the sensor is as sensitive as below 1 ppb.

关键词： gas sensor Resonant microcantilever N-doped nanoporous carbon Selective detection Hydrogen sulfide(H2S)

Microwave-assisted hydrothermal synthesis of Pt/SnO2 gas sensor for CO detection

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Chinese Chemical Letters 2020年第8期31卷 2029-2032页

作者： Qingji Wang Liwen Bao Zongqiang Cao Chaoyang Li Xu Li Fangmeng Liu Peng Sun Geyu Lu State Key Laboratory of Marine Resource Utilization in South China Sea College of Information and Communication EngineeringHainan UniversityHaikou 570228China School of Chemical Engineering&Light Industry Guangdong University of TechnologyGuangzhou 510006China State Key Laboratory on Integrated Optoelectronics College of Electronic Science and EngineeringJilin UniversityChangchun 130012China

In this paper,the Pt/SnO2 nanostructures were prepared via a facile one-step microwave assisted hydrothermal *** structure of the introduced Pt/SnO2 and its gas-sensing properties toward CO were *** results from the TEM test reveal that Pt grows on the SnO2 nanostructure,which was not found for bulk in this situ method,constructing Pt/*** results indicated that the sensor using 3.0 wt%Pt/SnO2 to 100 ppm carbon monoxide performed a superior sensing properties compared to 1.5 wt%and 4.5 wt%Pt/SnO2 at 225℃.The response time of 3.0 wt%sensor is 16 s to 100 ppm CO at225℃.Such enhanced gas sensing performances could be attributed to the chemical and electrical *** view of chemical factors,the presence of Pt facilitates the surface reaction,which will improve the gas sensing *** respect to the electrical factors,the Pt/SnO2 plays roles in increasing the sensor’s response due to its characteristic *** addition,the one-step in situ microwave assisted process provides a promising and versatile choice for the preparation of gas sensing materials.

关键词： Microwave assisted hydrothermal method SnO2 Pt CO gas sensor

Enhanced Formaldehyde gas sensor based on Au-loaded ZnSnO_(3) Microspheres Nanocomposites

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Journal of Wuhan University of Technology(Materials Science) 2022年第6期37卷 1061-1065页

作者： HE Xingxin CHEN Jie YING Zhihua ZHENG Xiaolong ZHENG Peng College of Electronics and Information Hangzhou Dianzi UniversityHangzhou 310018China

ZnSnO_(3) microspheres was compounded by hydrothermal method with sodium alginate(SA)as a crystal growth modifier,and the Au nanoparticles were decorated on the surface of ZnSnO_(3) microspheres by simple solution method and heat treatment *** structure and morphology of the prepared samples were characterized by X-ray diffraction(XRD)and scanning electron microscopy(SEM).Under ultraviolet(UV)irradiation,the 0.2wt%Au/ZnSnO_(3)@4g/L SA sensor could detect HCHO and reached a good response of 18.8 at 20 ppm,which was three times higher than the ZnSnO_(3) in the absence of *** sensor also performed an outstanding linearity within 5-20 ppm HCHO and satisfied ***,the possible mechanism of the influence of Au on gas sensitivity is also proposed.

关键词： ZnSnO_(3) Au HCHO gas sensor SA

Large Mesoporous Tin Dioxide Powders for gas sensor Materials-Effects of Various Additives on the Mesostructure and the H_2 Sensing Properties

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稀有金属材料与工程 2006年第A3期35卷 455-458页

作者： Takeo Hyodo Kumiko Murayama Yasuhiro Shimizu Makoto Egashira Department of Materials Science and Engineering Faculty of EngineeringNagasaki University1-14 Bunkyo-machiNagasaki 852-8521Japan

Preparation of large mesoporous tin dioxide (lm-SnO_2) under various conditions was attempted by utilizing a self-assembly of a triblock copolymer,P123:(EO)_(20)(PO)_(70)(EO)_(20) or F127:(EO)_(106)(PO)_(70)(EO)_(106)(EO:ethylene oxide and PO: propylene oxide).The sensor fabricated from calcined lm-SnO_2 powder,which had been prepared by using P123 as a template,Na_2SnO_3 as a tin source,and TEOS as an additive ([TEOS]/[Na_2SnO_3]=0.5 in the precursor solution),showed the largest response to 1×10^(-3) hydrogen at 350℃among the sensors *** existence of two kinds of SnO_2 particles with different sizes (ca.100 nm and several nm in diameter) may be important to improve the hydrogen sensing properties drastically.

关键词： mesoporous tin dioxide triblock copolymer triethoxyorthosilicate hydrogen gas sensor

Spectral Absorption gas sensor Based on Anti-Resonant Reflecting Optical Waveguide

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Photonic sensors 2014年第2期4卷 128-131页

作者： Haihu YU Yu ZHENG Huiyong GUO Beibei CAO Huifeng WEI National Engineering Laboratory for Fiber Optic Sensing Technology Wuhan University of Technology Wuhan430070 China Key Laboratory of Fiber Optic Sensing Technology and Information Processing Ministry of Education WuhanUniversity of Technology Wuhan 430070 China State Key Laboratory of Optical Fiber and Cable Manufacture Technology Yangtze Optical Fibre and Cable CompanyLtd. Wuhan 430073 China

An air-silica microstructure optical fiber based on the anti-resonant reflecting optical waveguide （ARROW） principle was used to develop a spectral absorption gas sensor. The ARROW fiber has an air core and an air cladding layer. An ARROW fiber with a length of 725mm was used to construct a sensing system to detect acetylene gas. The gas was injected into the fiber from one end of the fiber. The transmission spectra were collected using an optical spectrum analyzer. The results indicate that the system can detect the gas of different concentrations and has the good system linearity. The response time of the system is about 200 s.

关键词： Microstructure optical fiber ARROW fiber gas sensor spectrum absorption acetylene gas