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Extremely large, non-oxidized graphene flakes based on spontaneous solvent insertion into graphite intercalation compounds

Cited 11 time in Web of Science Cited 11 time in Scopus
Authors
Kim, Jungmo; Yoon, Gabin; Kim, Jin; Yoon, Hyewon; Baek, Jinwook; Lee, Joong Hee; Kang, Kisuk; Jeon, Seokwoo
Issue Date
2018-11
Citation
Carbon, Vol.139, pp.309-316
Abstract
Demand for an effective strategy for exfoliating layered materials into flakes without perturbing their intrinsic structure is growing. Herein, we introduce an effective fabrication method of large-sized non-oxidized graphene flakes (NOGFs) as a representative example of a general strategy using spontaneous insertion of exfoliating medium into a layered material. We fabricated a ternary graphite intercalation compound (t-GIC) with stoichiometry of KC24(THF)(2), and analyzed its morphology and electronic structure through experimental and computational approach. Interactions between the t-GIC and aprotic organic solvents with different polarities were investigated, where a unique swelling behavior was observed with dimethyl sulfoxide (DMSO). Based on the analysis of the phenomena, we demonstrate facile exfoliation of the t-GIC in polyvinyl pyrrolidone (PVP)-DMSO solution for fabrication of highly crystalline and large-sized NOGFs. The lateral size of the NOGFs ranges over 30 mu m, while the 98% having thickness below 10 layers. The NOGF film exhibits supreme electrical conductivity of 3.36 x 10(5) S/m, which is, to our best knowledge, the highest value for a thin conductive film made of graphene flakes. (C) 2018 Elsevier Ltd. All rights reserved.
ISSN
0008-6223
URI
http://hdl.handle.net/10371/164996
DOI
https://doi.org/10.1016/j.carbon.2018.06.071
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College of Engineering/Engineering Practice School (공과대학/대학원)Dept. of Material Science and Engineering (재료공학부) Journal Papers (저널논문_재료공학부)
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