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The sensitivity of a semiconductor sensor using SnO2 to H2S in air could be enormously promoted by loading SnO2 with a small amount of CuO. However, response kinetics began to deteriorate rather sharply as the H2S concentration decreased below a certain limit, which depended on CuO loadings. XPS measurements on a series of CuO-SnO2 samples calcined in air revealed that the binding energies (BEs) for O1s and Sn3d5/2 levels shifted downward from those of pure SnO2, while Cu2p3/2 level showed andoi:10.1380/jsssj.17.469 fatcat:ql4owdwrszbmtf7x3jvogkif74