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Growth of ultra-uniform graphene using a Ni/W bilayer metal catalyst

Title
Growth of ultra-uniform graphene using a Ni/W bilayer metal catalyst
Authors
Yang, JH[Yang, Jae Hoon]Hwang, JS[Hwang, Jae Seok]Yang, HW[Yang, Hyoung Woo]Jang, AR[Jang, A-Rang]Shin, HS[Shin, Hyeon Suk]Jang, JE[Jang, Jae-Eun]Kang, DJ[Kang, Dae Joon]
DGIST Authors
Yang, JH[Yang, Jae Hoon]; Jang, JE[Jang, Jae-Eun]
Issue Date
2015-01-26
Citation
Applied Physics Letters, 106(4)
Type
Article
Article Type
Article
Keywords
CarbonCarbon PrecipitationCatalyst SystemCatalystsElectronic ApplicationFacile FabricationFilm GrowthGrapheneGrowth MechanismsInsulating SubstratesMagnetic FilmsMulti-Layer GrapheneNickelPolycrystallineTransmission Electron MicroscopyTungstenTungsten CarbideX Ray Diffraction Analysis
ISSN
0003-6951
Abstract
We investigated a bilayer catalyst system consisting of polycrystalline Ni and W films for growing mono-layer graphene over large areas. Highly uniform graphene was grown on Ni/W bilayer film with 100% coverage. The graphene grown on Ni/W bilayer film and transferred onto an insulating substrate exhibited average hole and electron mobilities of 727 and 340 cm2V-1s-1, respectively. A probable growth mechanism is proposed based on X-ray diffractometry and transmission electron microscopy, which suggests that the reaction between diffused carbon and tungsten atoms results in formation of tungsten carbides. This reaction allows the control of carbon precipitation and prevents the growth of non-uniform multilayer graphene on the Ni surface; this has not been straightforwardly achieved before. These results could be of importance in better understanding mono-layer graphene growth, and suggest a facile fabrication route for electronic applications. © 2015 AIP Publishing LLC.
URI
http://hdl.handle.net/20.500.11750/1578
DOI
10.1063/1.4907166
Publisher
American Institute of Physics Publishing
Related Researcher
  • Author Jang, Jae Eun Advanced Electronic Devices Research Group(AEDRG)
  • Research Interests
Files:
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Collection:
Information and Communication EngineeringETC1. Journal Articles


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