Bifunctional Sensing Mechanism of SnO2-ZnO Composite Nanofibers for Drastically Enhancing the Sensing Behavior in H-2 Gas

Title
Bifunctional Sensing Mechanism of SnO2-ZnO Composite Nanofibers for Drastically Enhancing the Sensing Behavior in H-2 Gas
Authors
김현우
Keywords
composite nanofibers; SnO2; ZnO; sensors; hydrogen
Issue Date
2015-05
Publisher
AMER CHEMICAL SOC
Citation
ACS APPLIED MATERIALS & INTERFACES, v. 7, Page. 11351-11358
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.
URI
http://pubs.acs.org/doi/abs/10.1021/acsami.5b01817http://hdl.handle.net/20.500.11754/24790
ISSN
1944-8244
DOI
http://dx.doi.org/10.1021/acsami.5b01817
Appears in Collections:
COLLEGE OF ENGINEERING[S](공과대학) > ETC
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