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P2.4.11 Growth and H2S Gas Sensing Properties of CuO Functionalized ZnO Nanotetrapod

We report gas-sensing properties of thick films prepared using ZnO Nanotetrapods and CuOfunctionalized ZnO Nanotetrapods. Gas sensors based on ZnO nanostructure have been widely reported, but they have some limitations, such as low sensitivity, specificity and high working temperature. ZnO is a n-type semiconductor and CuO, a well-known sensitizer for H2S is a p-type semiconductor. The use of heterojunctions between p-type and n-type material has been previously reported in literature to increase the sensitivity. As expected sensitivity and selectivity of the CuO coated ZnO Nanotetrapods films towards H2S increased as compared to pure ZnO Nanotetrapods films. It was also observed ZnO Nanotetrapods film senses H2S at higher temperatures, whereas CuO-functionalized ZnO Nanotetrapods show a high sensitivity at very low temperatures.