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

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 cm{sup 2}V{sup −1}s{sup −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.
Authors:
 [1] ;  [2] ;  [3] ; ;  [1] ; ;  [4] ;  [5]
  1. Department of Physics, Sungkyunkwan University, Suwon 440-746 (Korea, Republic of)
  2. (Korea, Republic of)
  3. Department of Energy Science, Sungkyunkwan University, Suwon 440-746 (Korea, Republic of)
  4. Department of Chemistry, Low Dimensional Carbon Materials Center, Interdisciplinary School of Green Energy, Ulsan National Institute of Science and Technology, Ulsan 689-798 (Korea, Republic of)
  5. Department of Information and Communication Engineeing, Daegu Gyeongbuk Institute of Science and Technology, Daegu 711-873 (Korea, Republic of)
Publication Date:
OSTI Identifier:
22415209
Resource Type:
Journal Article
Resource Relation:
Journal Name: Applied Physics Letters; Journal Volume: 106; Journal Issue: 4; Other Information: (c) 2015 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; 71 CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSICS; CRYSTAL GROWTH; ELECTRON MOBILITY; FILMS; GRAPHENE; LAYERS; NICKEL; POLYCRYSTALS; SUBSTRATES; SURFACES; TRANSMISSION ELECTRON MICROSCOPY; TUNGSTEN; TUNGSTEN CARBIDES; X-RAY DIFFRACTION