Journal
NANOMATERIALS
Volume 9, Issue 7, Pages -Publisher
MDPI
DOI: 10.3390/nano9071015
Keywords
hydrothermal synthesis; semiconductor; SnO2; NiO nanocomposite; NO2; performances; sensing mechanism
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Funding
- National Natural Science Foundation of China [51507144]
- Fundamental Research Funds for the Central Universities [2019CDJGFCL001, XDJK2019B021]
- Chongqing Science and Technology Commission (CSTC) [cstc2016jcyjA0400]
- project of China Scholarship Council (CSC)
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In this study, we reported a successful synthesis of a nanocomposite based on SnO2 nanoneedles anchored to NiO microsphere by a simple two-step hydrothermal route. The results show that the SnO2/NiO nanocomposite-based sensor exhibits more prominent performances than the pristine NiO microsphere to NO2 such as larger responses and more outstanding repeatability. The improved properties are mainly attributed to the p-n heterojunctions formed at the SnO2-NiO interface, leading to the change of potential barrier height and the enlargement of the depletion layer. Besides, the novel and unique nanostructure provides large and effective areas for the surface reaction. In addition, a plausible growth mechanism and the enhanced sensing mechanism were proposed to further discuss the special nanostructure which will benefit the exploration of high-performance sensors.
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