Fast response time alcohol gas sensor using nanocrystalline F-doped SnO2 films derived via sol�?�gel method

Bulletin of materials science

C Ghanshyam²  Yeong-Her Wang¹  Sarbani Basu²  Pawan Kapur² 

[1] Department of Electrical Engineering, National Cheng Kung University, Tainan 70101, Taiwan$$Department of Electrical Engineering, National Cheng Kung University, Tainan 70101, TaiwanDepartment of Electrical Engineering, National Cheng Kung University, Tainan 70101, Taiwan$$;CSIR-Central Scientific Instruments Organisation, Sector-30, Chandigarh 160 030, India$$CSIR-Central Scientific Instruments Organisation, Sector-30, Chandigarh 160 030, IndiaCSIR-Central Scientific Instruments Organisation, Sector-30, Chandigarh 160 030, India$$

关键词: F-doped SnO2;    solâ€�?�gel;    gas sensor;    sensitivity.;   

DOI  :  

学科分类：材料工程

来源: Indian Academy of Sciences

【 摘 要 】

Pure and fluorine-modified tin oxide (SnO₂) thin films (250â€�??300 nm) were uniformly deposited on corning glass substrate using solâ€�?�gel technique to fabricate SnO₂-based resistive sensors for ethanol detection. The characteristic properties of the multicoatings have been investigated, including their electrical conductivity and optical transparency in visible IR range. Pure SnO₂ films exhibited a visible transmission of 90% compared with Fdoped films (80% for low doping and 60% for high doping). F-doped SnO₂ films exhibited lower resistivity (0.12 Ã�? 10^-4ð›�? cm) compared with the pure (14.16 Ã�? 10^-4ð›�? cm) one. X-ray diffraction and scanning electron microscopy techniques were used to analyse the structure and surface morphology of the prepared films. Resistance change was studied at different temperatures (523â€�??623 K) with metallic contacts of silver in air and in presence of different ethanol vapour concentrations. Comparative gas-sensing results revealed that the prepared F-doped SnO₂ sensor exhibited the lowest response and recovery times of 10 and 13 s, respectively whereas that of pure SnO₂ gas sensor, 32 and 65 s, respectively. The maximum sensitivities of both gas sensors were obtained at 623 K.

【 授权许可】

Unknown