H2S sensing properties of RGTO grown SnO2 films

Gas sensing characteristics of tin oxide thin films prepared using rheotaxial growth and thermal oxidation (RGTO) have been investigated as a function of temperature and concentration. These films are found to show maximum response towards H
₂
S at a temperature of 250°C. Sensor response is observed to follow a power law S = A[C]
^0.7
in concentration range of 1-100 ppm. The response of these films was also tested for other toxic gases and these films were found to show selectivity towards H
₂
S.