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Park, Kibog
Emergent Materials & Devices Lab
Research Interests
  • Semiconductor, Metal Oxide Thin Film, Graphene, Non-Volatile Memory, Quantum Transport, Quantum Computing Device

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In situ observations of gas phase dynamics during graphene growth using solid-state carbon sources

Cited 3 times inthomson ciCited 2 times inthomson ci
Title
In situ observations of gas phase dynamics during graphene growth using solid-state carbon sources
Author
Kwak, JinsungKwon, Tae-YangChu, Jae HwanChoi, Jae-KyungLee, Mi-SunKim, Sung YoubShin, Hyung-JoonPark, KibogPark, Jang-UngKwon, Soon-Yong
Keywords
CHEMICAL-VAPOR-DEPOSITION; FEW-LAYER GRAPHENE; LARGE-AREA; FILMS; EXFOLIATION; GRAINS; PMMA
Issue Date
2013-04
Publisher
ROYAL SOC CHEMISTRY
Citation
PHYSICAL CHEMISTRY CHEMICAL PHYSICS, v.15, no.25, pp.10446 - 10452
Abstract
A single-layer graphene has been uniformly grown on a Cu surface at elevated temperatures by thermal processing of a poly(methyl methacrylate) (PMMA) film in a rapid thermal annealing (RTA) system under vacuum. The detailed chemistry of the transition from solid-state carbon to graphene on the catalytic Cu surface was investigated by performing in situ residual gas analysis while PMMA/Cu-foil samples were being heated, in conjunction with interrupted growth studies to reconstruct ex situ the heating process. The data clearly show that the formation of graphene occurs by vaporizing hydrocarbon molecules from PMMA, such as methane and/or methyl radicals, which act as precursors, rather than by the direct graphitization of solid-state carbon. We also found that the temperature for vaporizing hydrocarbon molecules from PMMA and the length of time the gaseous hydrocarbon atmosphere is maintained, which are dependent on both the heating temperature profile and the amount of a solid carbon feedstock, are the dominant factors that determine the crystalline quality of the resulting graphene film. Under optimal growth conditions, the PMMA-derived graphene was found to have a carrier (hole) mobility as high as 2700 cm2 V−1 s−1 at room temperature, which is superior to common graphene converted from solid carbon.
URI
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DOI
10.1039/c3cp50959a
ISSN
1463-9076
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