Temperature dependent photoluminescence study on ZnO/Graphene nanocomposite films
- Authors
- Lee, Eunsil; Kim, Jong-Young; Park, Yong-Il; An, Sung Jin
- Issue Date
- Apr-2015
- Publisher
- ELSEVIER
- Keywords
- Graphene; ZnO; Vapour synthesis; Photoluminescence
- Citation
- CURRENT APPLIED PHYSICS, v.15, no.4, pp.563 - 566
- Journal Title
- CURRENT APPLIED PHYSICS
- Volume
- 15
- Number
- 4
- Start Page
- 563
- End Page
- 566
- URI
- https://scholarworks.bwise.kr/kumoh/handle/2020.sw.kumoh/19166
- DOI
- 10.1016/j.cap.2014.12.025
- ISSN
- 1567-1739
- Abstract
- We report observation of both free and defect-mediated excitonic emissions from temperature-dependent PL study on ZnO/graphene oxide (G-O) nanocomposite grown by ultrasonic assisted spray pyrolysis (UASP). From the temperature-dependent photoluminescence (PL) spectra of the ZnO/G-O nanocomposite, new graphene-related peak was observed at 372 nm along with the exciton transition bound to neutral acceptors or deep donors. The PL intensity of new graphene-related peaks (3.33 eV) become more prominent with increasing G-O concentration, and it was saturated or decreased with the addition of >7.0 wt% of G-O. This feature indicates that new graphene-related states were created below conduction band of ZnO, which supports the excitonic PL enhancement by graphene-embedding is contributed not by charge transfer, but by vacancy filling effect of G-O. (C) 2015 Elsevier B.V. All rights reserved.
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Collections - Department of Materials Science and Engineering > 1. Journal Articles
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