In this article, cupric oxide (CuO) leafletlike nanosheets have been synthesized by a facile, low-cost, and surfactant-free method, and they have further been successfully developed for sensitive and selective determination of hydrogen sulfide (H 2 S) with high recovery ability. The experimental results have revealed that the sensitivity and recovery time of the present H 2 S gas sensor are strongly dependent on the working temperature. The best H 2 S sensing performance has been achieved with a low detection limit of 2 ppb and broad linear range from 30 ppb to 1.2 ppm. The gas sensor is reversible, with a quick response time of 4 s and a short recovery time of 9 s. In addition, negligible responses can be observed exposed to 100-fold concentrations of other gases which may exist in the atmosphere such as nitrogen (N 2 ), oxygen (O 2 ), nitric oxide (NO), cabon monoxide (CO), nitrogen dioxide (NO 2 ), hydrogen (H 2 ), and so on, indicating relatively high selectivity of the present H 2 S sensor. The H 2 S sensor based on the CuO nanosheets also shows strong recovery ability and long-term stability, probably due to the effective diffusion of gas toward the whole sensing surface, as well as the different mechanism of H 2 S gas sensor from those reported at CuO nanowires and CuO−SnO 2 nanocomposites, where a layer of CuS or Cu 2 S has formed on the CuO surface.
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Zhang et al. (2010) studied this question.