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Direct exfoliation of graphite using a non-ionic polymer surfactant for fabrication of transparent and conductive graphene films

Cited 53 time in Web of Science Cited 54 time in Scopus
Authors
Kang, Min Soo; Kim, Kyung Tae; Lee, Jea Uk; Jo, Won Ho
Issue Date
2013-03
Publisher
Royal Society of Chemistry
Citation
Journal Of Materials Chemistry C Vol.1 No.9, pp. 1870-1875
Keywords
복합학
Abstract
A high-yielding dispersion of graphene at high concentration in solvent is critical for practical applications. Herein, we demonstrate the formation of a stable dispersion of pristine graphene in ethanol by exfoliating graphite flakes into individual graphene layers using a non-ionic polymer surfactant under bath-type sonication. Oligothiophene-terminated poly(ethylene glycol) was synthesized and used as a non-ionic and amphiphilic surfactant for exfoliating graphite into graphene. A high-quality graphene film was fabricated from the exfoliated graphene solution by the vacuum filtration method. TEM and SEM reveal that the size of exfoliated graphene flakes is larger than 1 mu m. When the graphene film was treated with nitric acid and thionyl chloride after washing with solvent, the film showed high performance with a sheet resistance of 0.3 k Omega sq(-1) and a transparency of 74% at 550 nm.
ISSN
2050-7526
2050-7526
Language
English
URI
https://hdl.handle.net/10371/83222
DOI
https://doi.org/10.1039/C2TC00586G
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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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