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Issue 4, 2017
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Highly dispersible edge-selectively oxidized graphene with improved electrical performance

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Abstract

We prepared liquid phase exfoliated edge-selectively oxidized graphene (LPEOG) with a high concentration in water (∼14.7 mg ml−1) and a high ratio of a single layer (70%). The edge of graphite was selectively oxidized by step II oxidation of the modified Hummers method, and we subsequently exfoliated the edge-selectively oxidized graphite (EOG) into LPEOG. The edge selective oxidation of the LPEOG was confirmed by X-ray photoelectron spectroscopy (XPS), X-ray diffraction (XRD), zeta-potentiometry, Raman spectroscopy, Fourier-transform infrared spectroscopy (FT-IR), atomic force microscopy (AFM), and transmission electron microscopy (TEM). The highly concentrated LPEOG ink can be used in solution processing such as simple drawing or spin casting. Reduced LPEOG showed a higher conductivity (120 000 S m−1) than that of reduced graphene oxide (68 800 S m−1) despite the small lateral size. A transparent conducting film prepared from the LPEOG ink showed a lower surface resistance (∼2.97 kΩ sq−1) at a higher transmittance (>83.0 %T) compared to those of the graphene oxide based film. These results indicate that preservation of π-conjugation of the basal plane of graphene is critical for electrical performance of graphene. Our method facilitates solution processing of graphene for a wide range of applications.

Graphical abstract: Highly dispersible edge-selectively oxidized graphene with improved electrical performance

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Supplementary files

Article information


Submitted
26 Jul 2016
Accepted
17 Dec 2016
First published
20 Dec 2016

Nanoscale, 2017,9, 1699-1708
Article type
Paper

Highly dispersible edge-selectively oxidized graphene with improved electrical performance

J. Park, Y. S. Kim, S. J. Sung, T. Kim and C. R. Park, Nanoscale, 2017, 9, 1699
DOI: 10.1039/C6NR05902C

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