期刊
SENSORS AND ACTUATORS B-CHEMICAL
卷 297, 期 -, 页码 -出版社
ELSEVIER SCIENCE SA
DOI: 10.1016/j.snb.2019.126816
关键词
CuO/ZnO; Natural template; Hydrogen sulfide sensor; Heterostructure; Porous tubule
资金
- International Science & Technology Cooperation Program of China [2016YFE0115100]
- Scientific and Technological Innovation Talents of Harbin [2016RAQXJ005]
- Young Innovation Talents of college in Heilongjiang Province [UNPYSCT-2016074, UNPYSCT-2017121]
- Key Laboratory of Functional Inorganic Material Chemistry, Ministry of Education, Heilongjiang University
The development of ZnO-based sensors towards the detection of trace H2S has recently aroused extensive attentions due to its very harmful to human health even at a concentration as low as 83 ppb. However, the fast response/recovery ZnO-based sensors for detecting ppb-level H2S were also challenging. In this study, porous CuO/ZnO heterostructural tubule was facilely and massively prepared by metal salt impregnation and subsequently calcination via confined effect of absorbent cotton. The influence of Cu2+ doping amounts and calcination temperature on the corresponding microstructure and gas sensing properties of the composites is investigated. The precursor with 3.67 at% Cu2+ doping was calcined at 600 degrees C to form heterostructural tubules (3.67 at% CuO/ZnO-600) with the specific surface area of 35.2 m(2) g(-1), which consist of monoclinic CuO ((similar to)21.8 nm) and hexagonal ZnO ((similar to)33.7 nm). The sensor based on 3.67 at% CuO/ZnO-600 shows better gas sensitivity to 50 ppb H2S at 170 degrees C with response and recovery times of 35 and 29 s, which represents the fastest response/recovery properties in reported ZnO-based ppb-level H2S sensors to date. Furthermore, the sensor has a low detection limit of 10 ppb and shows a wide linear range from 10 to 1000 ppb, good repeatability and long-term stability. Such excellent ppb-level H2S gas sensing performance is mainly ascribed to the inherent characteristics of hierarchically porous tubular structure, p-n heterojunction and surface adsorbed oxygen species. Moreover, the gas-sensing mechanism is also investigated in detail.
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