CuO-doped SnO[sub 2] thin films as hydrogen sulfide gas sensor

Khanna, Atul; Kumar, Rajesh; Bhatti, S. S.
June 2003
Applied Physics Letters;6/16/2003, Vol. 82 Issue 24, p4388
Academic Journal
CuO-loaded SnO[SUB2] element was earlier identified as a highly sensitive and selective H[SUB2]S gas sensor. A number of techniques have been used by different authors for preparing thick and thin films of SnO[SUB2] doped with CuO, which among various metal oxides has outstanding promoter action for the sensitive detection of H[SUB2]S by SnO[SUB2]. Here we report the growth and characterization of CuO-doped SnO[SUB2] thin films by a thermal evaporation technique. These thin films show an extremely high sensitivity of ∼10[SUP6] to few parts per million levels of H[SUB2]S gas in air. The gas sensor is characterized at four operating temperatures and its long-term stability in response to H[SUB2]S gas is tested over a period of 3 years.


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