文献类型：期刊文献

英文题名：The effects of oxygen on controlling the number of carbon layers in the chemical vapor deposition of graphene on a nickel substrate

作者：Dou, Wei-Dong[1,2,3];Yang, Qingdan[2,3];Lee, Chun-Sing[2,3]

机构：[1]Shaoxing Univ, Dept Phys, Shaoxing 312000, Peoples R China;[2]City Univ Hong Kong, Ctr Super Diamond & Adv Films COSDAF, Hong Kong, Hong Kong, Peoples R China;[3]City Univ Hong Kong, Dept Phys & Mater Sci, Hong Kong, Hong Kong, Peoples R China

年份：2013

卷号：24

期号：18

外文期刊名：NANOTECHNOLOGY

收录：SCI-EXPANDED(收录号：WOS:000317468700013)、、EI(收录号：20131716243545)、Scopus(收录号：2-s2.0-84876499657)、WOS

基金：This work is supported by the Research Grant Council of Hong Kong (Grant No. CityU 101809), National Natural Science Foundation of China (Grant No. 61106131), Zhejiang Provincial Natural Science Foundation of China (Grant No. Y6110072) and Qianjiang Talents Project of Science and Technology Department of Zhejiang Province (Grant No. 2012R10075).

语种：英文

外文关键词：Graphene - Nickel oxide - Oxygen - Substrates

外文摘要：While oxygen is typically considered undesirable during the chemical vapor deposition (CVD) of graphene on metal substrates, we demonstrate that suitable amounts of oxygen in the CVD system can in fact improve the uniformity and thickness control of the graphene film. The role of oxygen on the CVD of graphene on a nickel substrate using a propylene precursor was investigated with various surface analytical techniques. It was found that the number of carbon layers in the deposited graphene sample decreases as the concentration of oxygen increases. In particular, single-layer graphene can be easily obtained with an oxygen/propylene ratio of 1/9. In the presence of oxygen, a thin layer of nickel oxide will form on the substrate. The oxide layer decreases the concentration of carbon atoms dissolved in the nickel substrate and results in graphene samples with a decreasing number of carbon layers.