Photoluminescence and Band Gap Modulation in Graphene Oxide
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We report broadband visible photoluminescence from solid graphene oxide, and modifications of the emission spectrum by progressive chemical reduction. The data suggest a gapping of the two-dimensional electronic system by removal of π-electrons. We discuss possible gapping mechanisms, and propose that a Kekule pattern of bond distortions may account for the observed behavior.
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Suggested Citation: Luo, Z., P.M. Vora, E.J. Mele, A.T.C. Johnson and J.M. Kikkawa. (2009). "Photoluminescence and band gap modulation in graphene oxide." Applied Physics Letters. 94, 111909. Copyright 2009 American Institute of Physics. This article may be downloaded for personal use only. Any other use requires prior permission of the author and the American Institute of Physics. The following article appeared in Applied Physics Letters. and may be found at http://dx.doi.org/10.1063/1.3098358.