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Enhancement of integrity of graphene transferred by interface energy modulation

Title
Enhancement of integrity of graphene transferred by interface energy modulation
Author
천상모
Keywords
HIGH-QUALITY; FILMS; ELECTRODES
Issue Date
2013-08
Publisher
Elsevier Science B.V., Amsterdam.
Citation
Carbon December, Aug 2013, 65, P.165-174
Abstract
We report on the systematic studies of the parameters governing the integrity of graphene film during general "wet" transfer from a thermodynamic point of view. We chose polystyrene (PS) as a test carrier material and attempted to use eight different solvents to find optimal conditions for the graphene transfer from a catalyst film to a desired substrate without defects. When parameterizing the conventional chemical properties of solvents, the boiling points and surface tension were found to be critical in determining the quality of the transferred graphene. During the formation step of a conformal PS film on a graphene surface before catalyst etching, a solvent with a boiling point over similar to 140 degrees C was essential. During the following PS film removal step, a solvent with surface tension higher than approximately 29 dyn/cm led to the formation of a continuous graphene film without cracks and holes. In addition, a high spin-coating velocity and lower concentration of PS in the solvent enhanced the quality of a transferred graphene film. The UV treatment of Si/SiO2 (100 nm) was also found to improve the adhesion of the graphene on substrates. By electrical characterization, morphological differences were found to affect the electrical properties markedly. (C) 2013 Elsevier Ltd. All rights reserved.
URI
https://www.sciencedirect.com/science/article/pii/S0008622313007720?via%3Dihubhttp://hdl.handle.net/20.500.11754/45228
ISSN
0008-6223
DOI
10.1016/j.carbon.2013.08.010
Appears in Collections:
COLLEGE OF NATURAL SCIENCES[S](자연과학대학) > PHYSICS(물리학과) > Articles
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