Exfoliation of non-oxidized graphene flakes for scalable conductive fi…
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논문명 | Exfoliation of non-oxidized graphene flakes for scalable conductive film |
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저자 | Kwang Hyun Park, Bo Hyun Kim, Sung Ho Song, Jiyoung Kwon, Byung Seon Kong, Kisuk Kang, Seokwoo Jeon |
저널명 | Nano letters |
게재년월 | 2012/5/24 |
Vol. pp | 12권 6호 페이지 2871-2876 |
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–NaCl–ZnCl2 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 Ω/□ at ∼75% transmission) graphene films using the modified Langmuir–Blodgett 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.