Gas Sensing of SnO2 Nanoparticles and Pt/SnO2 Nanoparticles by Thermal Decomposition Process

• Main Authors: Ting-Wei Yang, 楊庭維
• Other Authors: Sheng-Chang Wang
• Format: Others
• Language: zh-TW
• Published: 102
• Online Access: http://ndltd.ncl.edu.tw/handle/33610753856977052162

碩士 === 南台科技大學 === 機械工程系 === 101 === In this study, Gas sensing of SnO2 nanoparticles by thermal decocomposition method is studied. The SnO2 nanoparticles is prepared in this experiment, Sn(OA)x was prepared under inert atmosphere and high temperature by using tin oxide powder and oleic acid as the solvent, then Sn(OA)x, surfactants of Tri-n-octylamine、oleic acid were reacted in the air atmosphere at high temperature to form SnO2 nanoparticles, and transform into slurry. A layer of SnO2 thick film was printed on the platinum comb electrodes of the alumina substrate, SnO2 was then measured under different working temperatures on the sensitivity. Besides that, investigation on the influence of working temperature on sensing test, Sensing film annealed at different temperature and adding of metals, Pt/ SnO2 thick film on the influence of gas sensing properties were done. The result showed that when the surfactant oleic acid was injected, the amount of oleic acid varied from 2 mmol~16 mmol, the average diameter of the powder increased from 5.5 nm to 12 nm。SnO2 slurry was printed four times on the alumina substrate and the thickness of the thick film was about 38 μm. In the experiment of gas sensing resistance change, the optimal temperature for hydrogen(1000 ppm)was 300℃, and with Sensitivity up to 8600. The response and recovery speed can be increased by adding Pt. The repetitive of gas sensing circulation of air to hydrogen gas showed good results.