期刊
NANOSCALE
卷 10, 期 15, 页码 7210-7217出版社
ROYAL SOC CHEMISTRY
DOI: 10.1039/c8nr01379a
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资金
- Key Laboratory of Micro-systems and Micro-Structures Manufacturing of Ministry of Education, Harbin Institute of Technology [2017KM007]
- China Postdoctoral Science Foundation
- Open Project of State Key Laboratory of Urban Water Resource and Environment, Harbin Institute of Technology [HCK201704]
- Open Project of National Defense Science and Technology Key Lab for Space Materials Behavior and Evaluation
- China Scholarship Council [[2017]3105]
SnS2 nanosheets with unique properties are excellent candidate materials for fabricating high-performance NO2 gas sensors. However, serious restacking and aggregation during sensor fabrication have greatly impacted the sensing response. In this study, flower-like hierarchical SnS2 was prepared by a simple microwave method and partially thermally oxidized to form hierarchical SnS2/SnO2 nanocomposites to further improve the sensing performance at low operating temperature. The fabricated SnS2/SnO2 sensor exhibited ultrahigh response (resistance ratio = 51.1) toward 1 ppm NO2 at 100 degrees C, roughly 10.2 times higher than that of pure SnS2 nanoflowers. The excellent and enhanced NO2 sensing performances of hierarchical SnS2/SnO2 nanocomposites were attributed to the novel hierarchical structure of SnS2 and the nanoheterojunction between SnS2 and the ultrafine SnO2 nanoparticles. The SnS2/SnO2 sensors also exhibited excellent selectivity and reliable repeatability. The simple fabrication of high performance sensing materials may facilitate the large-scale production of NO2 gas sensors.
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