Enhanced NOx gas sensing properties of Cr2O3 film modified ordered porous ZnO gas sensors

doi:10.1016/j.ssi.2018.10.006

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	Enhanced NOx gas sensing properties of Cr2O3 film modified ordered porous ZnO gas sensors
	Wang, Tian-yang 1; Li, Yuan-yuan 1; Li, Tian-tian 1; Yu, Hui 1; Yang, Ying 1; Yang, Hua 2; Dong, Xiang-ting 1
刊名	Solid State Ionics
	2018-11-15
卷号	326 页码:173-182
关键词	Chemical detection Chemical sensors Coupling agents Film preparation Gas detectors Gas sensing electrodes Gases Heterojunctions II-VI semiconductors Nitrogen oxides Oxide minerals Ultrasonic applications Wide band gap semiconductors Zinc oxide Chemical plating Gas response Gas sensing properties Large specific surface areas Ordered porous P-n heterojunctions Semiconductor gas sensors Soft template methods
ISSN号	01672738
DOI	10.1016/j.ssi.2018.10.006
英文摘要	According to recent reports, the most of semiconductor gas sensors had the higher operating temperature (from 100 to 300 °C), which caused the decrement of selectivity and restricted its application. In this study, we prepared the ordered porous Cr2O3/ZnO (OP-Cr2O3/ZnO) gas sensor materials with p-n heterojunction structure, successfully. Firstly, we synthesized ordered porous zinc oxide matrix by soft template method, and then the surface of the ZnO matrix was modified by silane coupling agent to increase the activity of surface. The Cr2O3 film was assembled to the surface of the modified matrix through ultrasonic chemical plating method, and the ordered porous Cr2O3/ZnO composite material was obtained. The prepared ordered porous Cr2O3/ZnO gas sensor showed excellent response and selectivity toward NOx gas at room temperature (25 °C ± 2 °C). When the NOx concentration was 100 ppm, the response could reach to 86.7% and the response time was only 4 s, the detection limit was only 0.05 ppm. The superior gas sensing properties of the OP-Cr2O3/ZnO could been attributed to the loose, ordered porous structure, the large specific surface area, the catalysis of the Cr2O3, and the synergistic effect of p-n heterojunction structure. © 2018 Elsevier B.V.
语种	英语
出版者	Elsevier B.V., Netherlands
内容类型	期刊论文
源URL	[http://ir.lut.edu.cn/handle/2XXMBERH/114730]
专题	兰州理工大学
作者单位	1.School of Chemistry & Environmental Engineering, Changchun University of Science and Technology, Changchun; 130022, China; 2.School of Science, Langzhou University of Technology, Lanzhou; 730050, China
推荐引用方式 GB/T 7714	Wang, Tian-yang,Li, Yuan-yuan,Li, Tian-tian,et al. Enhanced NOx gas sensing properties of Cr2O3 film modified ordered porous ZnO gas sensors[J]. Solid State Ionics,2018,326:173-182.
APA	Wang, Tian-yang.,Li, Yuan-yuan.,Li, Tian-tian.,Yu, Hui.,Yang, Ying.,...&Dong, Xiang-ting.(2018).Enhanced NOx gas sensing properties of Cr2O3 film modified ordered porous ZnO gas sensors.Solid State Ionics,326,173-182.
MLA	Wang, Tian-yang,et al."Enhanced NOx gas sensing properties of Cr2O3 film modified ordered porous ZnO gas sensors".Solid State Ionics 326(2018):173-182.