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Valence-band electronic structure evolution of graphene oxide upon thermal annealing for optoelectronics
File(s)
Author(s)
Mattevi, C
Yuji Takakuwa, YT
Type
Journal Article
Abstract
We report valence-band electronic structure evolution of graphene oxide (GO) upon its thermal reduction. The degree of oxygen functionalization was controlled by annealing temperature, and an electronic structure evolution was monitored using real-time ultraviolet photoelectron spectroscopy. We observed a drastic increase in the density of states around the Fermi level upon thermal annealing at ∼600 °C. The result indicates that while there is an apparent bandgap for GO prior to a thermal reduction, the gap closes after an annealing around that temperature. This trend of bandgap closure was correlated with the electrical, chemical, and structural properties to determine a set of GO material properties that is optimal for optoelectronics. The results revealed that annealing at a temperature of ∼500 °C leads to the desired properties, demonstrated by a uniform and an order of magnitude enhanced photocurrent map of an individual GO sheet compared to an as-synthesized counterpart.
Date Issued
2016-04-04
Date Acceptance
2016-03-18
Citation
Physica Status Solidi (A) Applied Research, 2016, 213 (9), pp.2380-2386
URI
DOI
ISSN
1862-6319
Publisher
Wiley
Start Page
2380
End Page
2386
Journal / Book Title
Physica Status Solidi (A) Applied Research
Volume
213
Issue
9
Copyright Statement
© 2016 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim. This is the peer reviewed version of the following article: Yamaguchi, H., Ogawa, S., Watanabe, D., Hozumi, H., Gao, Y., Eda, G., Mattevi, C., Fujita, T., Yoshigoe, A., Ishizuka, S., Adamska, L., Yamada, T., Dattelbaum, A. M., Gupta, G., Doorn, S. K., Velizhanin, K. A., Teraoka, Y., Chen, M., Htoon, H., Chhowalla, M., Mohite, A. D. and Takakuwa, Y. (2016), Valence-band electronic structure evolution of graphene oxide upon thermal annealing for optoelectronics. Phys. Status Solidi A, which has been published in final form at https://dx.doi.org/10.1002/pssa.201532855. This article may be used for non-commercial purposes in accordance With Wiley Terms and Conditions for self-archiving.
Subjects
Applied Physics
0204 Condensed Matter Physics
0912 Materials Engineering
1007 Nanotechnology
Publication Status
Published