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Proceedings Paper

Chemical bonding and stability of multilayer graphene oxide layers
Author(s): Cheng Gong; Suenne Kim; Si Zhou; Yike Hu; Muge Acik; Walt de Heer; Claire Berger; Angelo Bongiorno; Eliso Riedo; Yves Chabal
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Paper Abstract

The chemistry of graphene oxide (GO) and its response to external stimuli such as temperature and light are not well understood and only approximately controlled. This understanding is however crucial to enable future applications of the material that typically are subject to environmental conditions. The nature of the initial GO is also highly dependent on the preparation and the form of the initial carbon material. Here, we consider both standard GO made from oxidizing graphite and layered GO made from oxidizing epitaxial graphene on SiC, and examine their evolution under different stimuli. The effect of the solvent on the thermal evolution of standard GO in vacuum is first investigated. In situ infrared absorption measurements clearly show that the nature of the last solvent in contact with GO prior to deposition on a substrate for vacuum annealing studies substantially affect the chemical evolution of the material as GO is reduced. Second, the stability of GO derived from epitaxial graphene (on SiC) is examined as a function of time. We show that hydrogen, in the form of CH, is present after the Hummers process, and that hydrogen favors the reduction of epoxide groups and the formation of water molecules. Importantly, this transformation can take place at room temperature, albeit slowly (~ one month). Finally, the chemical interaction (e.g. bonding) between GO layers in multilayer samples is examined with diffraction (XRD) methods, spectroscopic (IR, XPS, Raman) techniques, imaging (APF) and first principles modeling.

Paper Details

Date Published: 8 March 2014
PDF: 9 pages
Proc. SPIE 8987, Oxide-based Materials and Devices V, 89872C (8 March 2014); doi: 10.1117/12.2045554
Show Author Affiliations
Cheng Gong, The Univ. of Texas at Dallas (United States)
Suenne Kim, Georgia Institute of Technology (United States)
Si Zhou, Georgia Institute of Technology (United States)
Yike Hu, Georgia Institute of Technology (United States)
Muge Acik, The Univ. of Texas at Dallas (United States)
Walt de Heer, Georgia Institute of Technology (United States)
Claire Berger, Georgia Institute of Technology (United States)
Angelo Bongiorno, Georgia Institute of Technology (United States)
Eliso Riedo, Georgia Institute of Technology (United States)
Yves Chabal, The Univ. of Texas at Dallas (United States)

Published in SPIE Proceedings Vol. 8987:
Oxide-based Materials and Devices V
Ferechteh H. Teherani; David C. Look; David J. Rogers, Editor(s)

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