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Layer‐Controlled and Wafer‐Scale Synthesis of Uniform and High‐Quality Graphene Films on a Polycrystalline Nickel Catalyst
Author(s) -
Gong Youpin,
Zhang Xuemin,
Liu Guangtong,
Wu Liqiong,
Geng Xiumei,
Long Mingsheng,
Cao Xiaohui,
Guo Yufen,
Li Weiwei,
Xu Jianbao,
Sun Mengtao,
Lu Li,
Liu Liwei
Publication year - 2012
Publication title -
advanced functional materials
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 6.069
H-Index - 322
eISSN - 1616-3028
pISSN - 1616-301X
DOI - 10.1002/adfm.201200388
Subject(s) - materials science , graphene , chemical vapor deposition , crystallite , sheet resistance , wafer , nickel , layer (electronics) , chemical engineering , catalysis , nanotechnology , carbon fibers , hydrogen , composite material , composite number , metallurgy , organic chemistry , chemistry , engineering
Chemical vapor deposition (CVD) provides a synthesis route for large‐area and high‐quality graphene films. However, layer‐controlled synthesis remains a great challenge on polycrystalline metallic films. Here, a facile and viable synthesis of layer‐controlled and high‐quality graphene films on wafer‐scale Ni surface by the sequentially separated steps of gas carburization, hydrogen exposure, and segregation is developed. The layer numbers of graphene films with large domain sizes are controlled precisely at ambient pressure by modulating the simplified CVD process conditions and hydrogen exposure. The hydrogen exposure assisted with a Ni catalyst plays a critical role in promoting the preferential segregation through removing the carbon layers on the Ni surface and reducing carbon content in the Ni. Excellent electrical and transparent conductive performance, with a room‐temperature mobility of ≈3000 cm 2 V −1 s −1 and a sheet resistance as low as ≈100 Ω per square at ≈90% transmittance, of the twisted few‐layer grapheme films grown on the Ni catalyst is demonstrated.