Room temperature H2S sensing properties and mechanism of CeO2-SnO2 sol-gelthin films

Using non-alkoxide SnCl2 . 2H(2)O, Ce(NH4)(2)(NO3)(6) as precursors, room t emperature H2S gas sensitive CeO2-SnO2 thin films have been obtained. In th is paper, the synthesis process of CeO2-SnO2 thin films has been introduced ; the gas sensing properties of the CeO2-SnO2 thin films were investigated and compared with those of SnO2 and ZrO2-SnO2 thin films. The experiments i llustrate that CeO2-SnO2 thin film has quite a quick response and recovery behavior, high selectivity, and has better sensitivity than that of ZrO2-Sn O2 thin film toward low concentration of H2S at room temperature. The sensi ng mechanism of CeO2-SnO2 thin films toward H2S at room temperature has als o been discussed in this paper. (C) 2000 Elsevier Science S.A. All rights r eserved.