期刊
SENSORS AND ACTUATORS B-CHEMICAL
卷 290, 期 -, 页码 233-241出版社
ELSEVIER SCIENCE SA
DOI: 10.1016/j.snb.2019.03.092
关键词
Core-Shell; Nanowire; Atomic layer deposition; Gas sensor; CuO-SnO2; Formaldehyde
资金
- National Key R&D Program of China [2016YFE0110700]
- National Natural Science Foundation of China [U1632121, 51861135105, 61874034]
- Natural Science Foundation of Shanghai [18ZR1405000]
Highly sensitive and selective gas sensors based on heterostructured p-CuO/n-SnO2 core-shell nanowires (NWs) with precisely controlled shell thickness were synthesized through a sequential process combining a solution processing and atomic layer deposition. The gas sensing devices were fabricated on micro-electromechanical systems, which has triggered great research interest for low power consumption and highly integrated design. The designed p-CuO/n-SnO2 core-shell NW structured gas sensors exhibited superior gas sensing performance, which is closely related to the thickness of the SnO2 shell. Specifically, p-CuO/n-SnO2 core-shell NWs with a 24 nm thick SnO2 shell displayed a high sensitivity (R-a/R-g) of 2.42, whose rate of resistance change (i.e. 1.42) is 3 times higher than the pristine CuO NW sensor when detecting 50 ppm formaldehyde (HCHO) at 250 degrees C. The enhanced gas sensing performance could be attributed to the formation of p-n heterojunction which was revealed by specific band alignment and the heterojunction-depletion model. Besides, the well-structured p-CuO/n-SnO2 core-shell NWs achieved excellent selectivity for HCHO from commonly occurred reducing gases. In a word, such heterostructured p-CuO/n-SnO2 core-shell NW gas sensors demonstrate a feasible approach for enhanced sensitive and selective HCHO detection.
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