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SnO 2 /CuO nano-hybrid foam sensors were fabricated through thermal oxidation of Sn–Cu foam synthesized by electrochemical deposition, and their gas sensing properties were investigated. The macro-porous Sn–Cu foam was formed during electrodeposition, and its pore wall was composed of self-supported nano-sized dendrites. The annealing at 700 °C converted the Sn–Cu foam into the SnO 2 /CuO nano-hybrid foam with preserving the structural integrity and pore structure. The SnO 2 /CuO nano-hybrid foam sensor responded to the reducing gases such as H 2 , CO, NH 3 , NO x , CH 5 OH, and H 2 S, but the foam sensor exhibited two orders of magnitude higher gas response toward H 2 S. The enhanced sensitivity and selectivity toward H 2 S gas can be attributed to the formation of resistive p-CuO/n-SnO 2 junction in nano-scale. |
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