期刊
SENSORS AND ACTUATORS B-CHEMICAL
卷 284, 期 -, 页码 305-315出版社
ELSEVIER SCIENCE SA
DOI: 10.1016/j.snb.2018.12.152
关键词
NiO/NiCr2O4; Xylene detection; Selectivity; Heterojunction; Gas sensor
资金
- National Key Research and Development Program [2016YFC0207300]
- National Natural Science Foundation of China [61722305, 61833006, 61520106003]
- Science and Technology Development Program of Jilin Province [20170520162JH]
- China Postdoctoral Science Foundation [2017T100208, 2015M580247]
Xylene is a harmful and hazardous volatile organic compound (VOC) indoors, thus selective and sensitive detection for subppm-level xylene is crucial, however a remained challenge. In this work, p-NiO/p-NiCr2O4 nanocomposites were successfully synthesized through a simple hydrothermal route and used as sensing materials. In the comparative gas sensing test, the sensor fabricated from NiO/NiCr2O4 (Cr/Ni=25 at%) nanocomposite exhibited the highest response (66.2-100 ppm) to xylene, which was 37.2 times higher than that of the pure NiO sensor. Moreover, the NiO/NiCr2O4 nanocomposite gas sensor showed not only superior xylene selectivity with low cross-responses to interfering gases such as ethanol (S-xylene/S-ethanol = 11.8) and acetone (S-xylene/S-acetone = 10.2) but also ppb-level detection limit (1.2-50 ppb xylene) at 225 degrees C. The synergistic catalytic effect between NiO and NiCr2O4, optimized structural parameters and marked resistive variation due to the formation of nanoscale p-p heterojunctions were regarded as the main reasons for the ultrasensitive and selective xylene detection.
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