Room-Temperature High-Performance H2S Sensor Based on Porous CuO Nanosheets Prepared by Hydrothermal Method

Zhijie Li, Ningning Wang, Zhijie Lin, Junqiang Wang, Wei Liu, Kai Sun, Yong Qing Fu, Zhiguo Wang

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144 Citations (Scopus)
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Abstract

Porous CuO nanosheets were prepared on alumina tubes using a facile hydrothermal method, and their morphology, microstructure, and gas-sensing properties were investigated. The monoclinic CuO nanosheets had an average thickness of 62.5 nm and were embedded with numerous holes with diameters ranging from 5 to 17 nm. The porous CuO nanosheets were used to fabricate gas sensors to detect hydrogen sulfide (H2S) operating at room temperature. The sensor showed a good response sensitivity of 1.25 with respond/recovery times of 234 and 76 s, respectively, when tested with the H2S concentrations as low as 10 ppb. It also showed a remarkably high selectivity to the H2S, but only minor responses to other gases such as SO2, NO, NO2, H2, CO, and C2H5OH. The working principle of the porous CuO nanosheet based sensor to detect the H2S was identified to be the phase transition from semiconducting CuO to a metallic conducting CuS.
Original languageEnglish
Pages (from-to)20962-20968
JournalACS applied materials & interfaces
Volume8
Issue number32
Early online date22 Jul 2016
DOIs
Publication statusE-pub ahead of print - 22 Jul 2016

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