Surface Engineering of Copper Foils for Growing Centimeter-Sized Single-Crystalline Graphene

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• 作者：Li Lin ; Jiayu Li ; Huaying Ren ; Ai Leen Koh ; Ning Kang ; Hailin Peng ; H. Q. Xu ; Zhongfan Liu
• 刊名：ACS Nano
• 出版年：2016
• 出版时间：February 23, 2016
• 年：2016
• 卷：10
• 期：2
• 页码：2922-2929
• 全文大小：388K
• ISSN：1936-086X

文摘

The controlled growth of high-quality graphene on a large scale is of central importance for applications in electronics and optoelectronics. To minimize the adverse impacts of grain boundaries in large-area polycrystalline graphene, the synthesis of large single crystals of monolayer graphene is one of the key challenges for graphene production. Here, we develop a facile surface-engineering method to grow large single-crystalline monolayer graphene by the passivation of the active sites and the control of graphene nucleation on copper surface using the melamine pretreatment. Centimeter-sized hexagonal single-crystal graphene domains were successfully grown, which exhibit ultrahigh carrier mobilities exceeding 25 000 cm² V^–1 s^–1 and quantum Hall effects on SiO₂ substrates. The underlying mechanism of melamine pretreatments were systematically investigated through elemental analyses of copper surface in the growth process of large single-crystals. This present work provides a surface design of a catalytic substrate for the controlled growth of large-area graphene single crystals.