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Journal of Nanomaterials
Volume 2014, Article ID 925253, 6 pages
Research Article

Evaluation of Layered Graphene Prepared via Hydroxylation of Potassium-Graphite Intercalation Compounds

1Department of Applied Chemistry, Faculty of Engineering, Oita University, 700 Dannoharu, Oita 870-1192, Japan
2High Strength Polymer Laboratory, High Performance Plastics Company, Sekisui Chemical Co. Ltd., 2-1 Hyakuyama, Shimamoto-cho, Mishima-gun, Osaka 618-0021, Japan

Received 7 April 2014; Revised 6 June 2014; Accepted 7 June 2014; Published 3 August 2014

Academic Editor: Naoki Kishi

Copyright © 2014 Takuya Wada et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.


Layered graphene was prepared via the hydroxylation of potassium-graphite intercalation compound (KC8) produced from exfoliated graphite flake powder. When a small amount of water was dropped onto the KC8 in an oxygen-free atmosphere, the stage structure of the intercalation compounds was broken, and agglomerated graphene was obtained. Sonication of this agglomerated graphene in buffered water containing sodium dodecyl sulfate followed by rinsing with hot water yielded gray samples. Using scanning electron microscopy, X-ray diffraction analysis, and Raman spectroscopy, the gray samples were determined to be composed of a few layers of graphene with an area of 20–100 μm2 and thickness of 1.7 nm. They were thinner than those obtained when starting with natural graphite.