Exfoliation of Non-Oxidized Graphene Flakes for Scalable Conductive Film
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- 作者：Kwang Hyun Park ; Bo Hyun Kim ; Sung Ho Song ; Jiyoung Kwon ; Byung Seon Kong ; Kisuk Kang ; Seokwoo Jeon
- 刊名：Nano Letters
- 出版年：2012
- 出版时间：June 13, 2012
- 年：2012
- 卷：12
- 期：6
- 页码：2871-2876
- 全文大小：400K
- 年卷期：v.12,no.6(June 13, 2012)
- ISSN：1530-6992
文摘
The increasing demand for graphene has required a new route for its mass production without causing extreme damages. Here we demonstrate a simple and cost-effective intercalation based exfoliation method for preparing high quality graphene flakes, which form a stable dispersion in organic solvents without any functionalization and surfactant. Successful intercalation of alkali metal between graphite interlayers through liquid-state diffusion from ternary KCl鈥揘aCl鈥揨nCl2 eutectic system is confirmed by X-ray diffraction and X-ray photoelectric spectroscopy. Chemical composition and morphology analyses prove that the graphene flakes preserve their intrinsic properties without any degradation. The graphene flakes remain dispersed in a mixture of pyridine and salts for more than 6 months. We apply these results to produce transparent conducting (930 惟/鈻?at 75% transmission) graphene films using the modified Langmuir鈥揃lodgett method. The overall results suggest that our method can be a scalable (>1 g/batch) and economical route for the synthesis of nonoxidized graphene flakes.