Bifunctional Sensing Mechanism of SnO2-ZnO Composite Nanofibers for Drastically Enhancing the Sensing Behavior in H-2 Gas
- Authors
- Katoch, Akash; Kim, Jae-Hun; Kwon, Yong Jung; Kim, Hyoun Woo; Kim, Sang Sub
- Issue Date
- Jun-2015
- Publisher
- AMER CHEMICAL SOC
- Keywords
- composite nanofibers; SnO2; ZnO; sensors; hydrogen
- Citation
- ACS APPLIED MATERIALS & INTERFACES, v.7, no.21, pp.11351 - 11358
- Indexed
- SCIE
SCOPUS
- Journal Title
- ACS APPLIED MATERIALS & INTERFACES
- Volume
- 7
- Number
- 21
- Start Page
- 11351
- End Page
- 11358
- URI
- https://scholarworks.bwise.kr/hanyang/handle/2021.sw.hanyang/157120
- DOI
- 10.1021/acsami.5b01817
- ISSN
- 1944-8244
- Abstract
- SnO2-ZnO composite nanofibers fabricated using an electrospinning method exhibited exceptional hydrogen (H-2) sensing behavior. The existence of tetragonal SnO2 and hexagonal ZnO nanograins was confirmed by an analysis of the crystalline phase of the composite nanofibers. A bifunctional sensing mechanism of the composite nanofibers was proposed in which the combined effects of SnO2-SnO2 homointerfaces and ZnO-SnO2 heterointerfaces contributed to an improvement in the H-2 sensing characteristics. The sensing process with respect to SnO2-ZnO heterojunctions is associated not only with the high barrier at the junctions, but also the semiconductor-to-metallic transition on the surface of the ZnO nanograins upon the introduction of H-2 gas.
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