Journal
JOURNAL OF ALLOYS AND COMPOUNDS
Volume 791, Issue -, Pages 1025-1032Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.jallcom.2019.03.364
Keywords
NiCo2O4@SnO2; Composites; Ethanol; Gas sensor
Categories
Funding
- National Natural Science Foundation of China [61801200]
- Fundamental Research Funds for the Central Universities [lzujbky-2018-33]
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Hybrid one-dimensional nanomaterials with hierarchical structure have received a great deal of attention as sensing materials due to their high surface area, excellent catalytic performance, and robust structures. Novel NiCo2O4 nanofibers-decorated SnO2 nanosheets are synthesized by a two-step electrospinning and hydrothermal methods. The like NiCo2O4@SnO2 composite-based sensor exhibits the highest sensitivity to ethanol (8.87 at 100 ppm) at a low working temperature of 160 degrees C. Also, the NiCo2O4@SnO2 composite-based sensor demonstrates short response/recovery time, excellent selectivity and long stability for the detection of ethanol gas. Importantly, compared with the pristine NiCo2O4 nanofibers, the sensor based on NiCo2O4@SnO2 composites can be improved approximately 8 times that of the former. Moreover, the sensor based on NiCo2O4@SnO2 composites shows excellent stability and repeatability and low detection limits (approximately 5 ppm). As a result, such one-dimensional hierarchical structure with effective p-n heterojunction and large specific surface area would display excellent electron transport property. (C) 2019 Elsevier B.V. All rights reserved.
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