An H 2 S sensor based on randomly distributed nano p–n junction between CuO and WO 3 has been demonstrated. Modification with CuO resulted in enhanced response kinetics towards H 2 S with high selectivity. CuO modified WO 3 thin films corresponding to 2.25at% of Cu exhibited a sensor response of 534 in comparison to that of pure WO 3 thin films that exhibited...
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