Journal
SENSORS AND ACTUATORS B-CHEMICAL
Volume 334, Issue -, Pages -Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.snb.2021.129606
Keywords
ZnO/SnO2; Composite nanofibers; Mixed nanofibers; Nano-junction; Gas sensors
Funding
- Vietnam National Foundation for Science and Technology Development (NAFOSTED) [103.02-2017.25]
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The study explored the gas-sensing performance of composite nanofibers with internal and external hetero-junctions of ZnO-SnO2, revealing enhanced response compared to mixed nanofibers. The gas-sensing mechanism of the hetero-nanojunctions was analyzed, attributing the remarkable gas sensing performance to the formation of internal heterojunctions.
The design of hetero-nanojunctions can greatly amplify the gas-sensing performance of conventional metal oxide gas sensors. In this study, the composite nanofibers (NFs) of ZnO-SnO2 internal heterojunctions (HJs) and the mixed NFs of ZnO/SnO2 external HJs were realized by using the electrospinning technique. Then, the gas-sensing characteristics of the as-synthesized NFs toward H2S and NO2 gases were systematically investigated and compared. The effects of the internal and external nanojunctions of the hetero-NF-based gas sensors were also explored. Results showed that the ZnO-SnO2 composite NFs demonstrate a higher response than those of the ZnO/SnO2 mixed NFs, as well as bare ZnO and SnO2 NFs. Also, the cross responses of the hetero-NF sensors toward 200 ppm CO, 250 ppm H-2,H- and 250 ppm NH3 were examined. The gas-sensing mechanism of the internal and external HJs of composite ZnO/SnO2 and mixed ZnO/SnO2 NFs was analyzed. The remarkable enhanced gas sensing performance of hetero-NFs was mainly attributed to the formation of internal HJs.
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