期刊
SENSORS AND ACTUATORS B-CHEMICAL
卷 318, 期 -, 页码 -出版社
ELSEVIER SCIENCE SA
DOI: 10.1016/j.snb.2020.128167
关键词
Ni foam; SnO2-decorated NiO; Gas sensor; Dip-coating; Toluene
资金
- National Natural Science Foundation of China [61474056, 51672103]
- National Key Technology R&D Program of China [2016YFB0401103]
Dense nickel oxide layer on Ni foam was prepared via a facile heating method and SnO2 nanostructures was attached to NiO through a simple dip-coating process. Construction of optimized SnO2 thin layer, which achieved by rationally adjusting of dip-coating times of Sn(OH)(4), leads to a prominently enhanced sensing properties to toluene. The sensor based on NiO foam with two times of dip-coating of SnO2 exhibits the best sensing performances with 9 and 8 seconds of response and recover time and a drastic selective response (R-a/R-g= 19.2) to 10 ppm toluene at 210 degrees C. Furthermore, an excellent linear dependence and a 30-day measurement with little decrease on response were observed. The superior sensing behavior of toluene and relevant sensing mechanism was explained by a large surface area of NiO foam, a unique structural sensitization and a common pn heterojunction effect.
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