Growth of large-area aligned pentagonal graphene domains on high-index copper surfaces  

作　　者：Kailun Xia Vasilii I. Artyukhov Lifei Sun Jingying Zheng Liying Jiao Boris I. Yakobson Yingying Zhang 

机构地区：[1]Department of Chemistry, Tsinghua University, Beijing 100084, China [2]Center for Nano and Micro Mechanics, Tsinghua University, Beijing 100084, China [3]Department of Materials Science and Nano Engineering, Rice University, Houston, TX 77005, USA

出　　处：《Nano Research》2016年第7期2182-2189,共8页纳米研究（英文版）

基　　金：This work was supported by the National Natural Science Foundation of China （Nos. 51422204 and 51372132） and the National Basic Research Program of China （No. 2013CB228506）.

摘　　要：Single-crystal graphene domains grown by chemical vapor deposition （CVD） intrinsically tend to have a six-fold symmetry; however, several factors can influence the growth kinetics, which can in turn lead to the formation of graphene with different shapes. Here we report the growth of oriented large-area pentagonal single-crystal graphene domains on Cu foils by CVD. We found that high-index Cu planes contributed selectively to the formation of pentagonal graphene. Our results indicated that lattice steps present on the crystalline surface of the underlying Cu promoted graphene growth in the direction perpendicular to the steps and finally led to the disappearance of one of the edges forming a pentagon. In addition, hydrogen promoted the formation of pentagonal domains. This work provides new insights into the mechanism of graphene growth.Single-crystal graphene domains grown by chemical vapor deposition （CVD） intrinsically tend to have a six-fold symmetry; however, several factors can influence the growth kinetics, which can in turn lead to the formation of graphene with different shapes. Here we report the growth of oriented large-area pentagonal single-crystal graphene domains on Cu foils by CVD. We found that high-index Cu planes contributed selectively to the formation of pentagonal graphene. Our results indicated that lattice steps present on the crystalline surface of the underlying Cu promoted graphene growth in the direction perpendicular to the steps and finally led to the disappearance of one of the edges forming a pentagon. In addition, hydrogen promoted the formation of pentagonal domains. This work provides new insights into the mechanism of graphene growth.

关 键 词：pentagonal graphene copper foil high index plane chemical vapor deposition large area 

分 类 号：O484[理学—固体物理] TQ127.11[理学—物理]