Authors: SARBANI BASU YEONGHER WANG C GHANSHYAM PAWAN KAPUR
Publish Date: 2013/08/06
Volume: 36, Issue: 4, Pages: 521-533
Abstract
Pure and fluorinemodified tin oxide SnO2 thin films 250–300 nm were uniformly deposited on corning glass substrate using sol–gel technique to fabricate SnO2based 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 Fdoped SnO2 films exhibited lower resistivity 0· 12 × 10 − 4 Ω cm compared with the pure 14·16 × 10 − 4 Ω cm one Xray 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 523–623 K with metallic contacts of silver in air and in presence of different ethanol vapour concentrations Comparative gassensing results revealed that the prepared Fdoped 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 KThe authors are thankful to the Department of Science and Technology DST New Delhi for providing financial assistance to carry out this research work The authors are also thankful to Mr A K Sharma Satinder Singh Sumit Thakur and Anubhav of CSIR–CSIO for their assistance in the sensor fabrication
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