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18 May 2009 Fabrication and gas sensitivity of poly-2,5-dimethoxyethynylbenzene/SnO2 nanocomposite
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this paper, the poly-yne poly-2,5-dimethoxyethynylbenzene/SnO2 nanocomposite is in-situ synthesized as gas sensing materials. The composite is accessed by two procedures both relying on Pd catalysis: (1) The reaction of ethynyltri-n-buyltin replacing Br belonged to 1,4-dibromo-2,5-dimethoxy benzene, and (2) The step-growth polymerization of PDMEB through heating up the mixer, at the same time adding appropriate SnO2 nanoparticle. The materials are characterized by FT-IR and the morphology of films is characterized by laser scanning confocal microscope (LSCM). Compared with pure PDMEB, it clearly appears that SnO2 components influence morphology of the nanocomposite film, which leads to variation of sensor response-recovery behavior. The poly-ynes nanocomposite is deposited on quartz crystal microbalance (QCM, whose corresponding operation frequency of baseline is 8.0MHz) to fabricate a gas sensor by drop-coating method. The PDMEB/SnO2 based QCM gas sensor has been investigated towards methane (CH4, in the range of 500-5000 ppm) gas. The sensor is exposed to various concentrations of CH4 gas and operated at room temperature. The frequency shift as the response of PDMEB/SnO2 based QCM gas sensor is charaterized. A fast response and recovery with good repeatability in a stable baseline condition is observed.
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Ping Sun, Yadong Jiang, Guangzhong Xie, Junsheng Yu, Ying Yu, and Jia Hu "Fabrication and gas sensitivity of poly-2,5-dimethoxyethynylbenzene/SnO2 nanocomposite", Proc. SPIE 7284, 4th International Symposium on Advanced Optical Manufacturing and Testing Technologies: Design, Manufacturing, and Testing of Micro- and Nano-Optical Devices and Systems, 728410 (18 May 2009);

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