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

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• 作者：Zhijie Li ; Ningning Wang ; Zhijie Lin ; Junqiang Wang ; Wei Liu ; Kai Sun ; Yong Qing Fu ; Zhiguo Wang
• 刊名：ACS Applied Materials & Interfaces
• 出版年：2016
• 出版时间：August 17, 2016
• 年：2016
• 卷：8
• 期：32
• 页码：20962-20968
• 全文大小：510K
• 年卷期：0
• ISSN：1944-8252

文摘

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.