Enhancement of integrity of graphene transferred by interface energy modulation

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 graph...

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Veröffentlicht in:Carbon (New York) 2013-12, Vol.65, p.165-174
Hauptverfasser: Kim, Un Jeong, Hur, Jaehyun, Cheon, Sangmo, Chung, Dae-Young, Son, Hyungbin, Park, Yeonsang, Roh, Young-Geun, Kim, Jineun, Lee, Jaesoong, Kim, Sang Won, Im, Kyuhyun, Park, Nokyoung, Kim, Juhun, Hwang, Sungwoo, Park, Wanjun, Lee, Chang-Won
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container_end_page 174
container_issue
container_start_page 165
container_title Carbon (New York)
container_volume 65
creator Kim, Un Jeong
Hur, Jaehyun
Cheon, Sangmo
Chung, Dae-Young
Son, Hyungbin
Park, Yeonsang
Roh, Young-Geun
Kim, Jineun
Lee, Jaesoong
Kim, Sang Won
Im, Kyuhyun
Park, Nokyoung
Kim, Juhun
Hwang, Sungwoo
Park, Wanjun
Lee, Chang-Won
description 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 ∼140°C was essential. During the following PS film removal step, a solvent with surface tension higher than approximately 29dyn/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 (100nm) 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.
doi_str_mv 10.1016/j.carbon.2013.08.010
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subjects Boiling points
Catalysts
Chemistry
Cross-disciplinary physics: materials science
rheology
Exact sciences and technology
Fullerenes and related materials
diamonds, graphite
General and physical chemistry
Graphene
Integrity
Materials science
Physics
Polystyrene resins
Silicon substrates
Solvents
Specific materials
Surface physical chemistry
Surface tension
title Enhancement of integrity of graphene transferred by interface energy modulation
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