H2S Sensing Properties and Mechanism of Macroporous Semiconductor Sensors

Macroporous (mp-) In2O3-based films with and without 1 wt% CuO loading were fabricated by a modified sol-gel technique employing polymethylmethacrylate microspheres as a template and their sensor responses to H2S and the reaction behavior of H2S over the sensor materials were investigated. Introduction of macropores into an In2O3 film and simultaneous loading of CuO on the In2O3 surface were enormously effective in improving the H2S response. The large surface area of mp-In2O3 loaded with CuO, which increased the reactivity of CuO with H2S, is probably the most important factor to enhance the H2S response.