Effects of thermally-induced changes of Cu grains on domain structure and electrical performance of CVD-grown graphene

Yaping Wu; Yufeng Hao; Mingming Fu; Wei Jiang; Qingzhi Wu; Peter A. Thrower; Richard D. Piner; Congming Ke; Zhiming Wu; Junyong Kang; Rodney S. Ruoff

doi:10.1039/C5NR06195D

Effects of thermally-induced changes of Cu grains on domain structure and electrical performance of CVD-grown graphene

Yaping Wu,^ab Yufeng Hao,*^bc Mingming Fu,^a Wei Jiang,^a Qingzhi Wu,^b Peter A. Thrower,^d Richard D. Piner,^b Congming Ke,^a Zhiming Wu,^a Junyong Kang*^a and Rodney S. Ruoff*^be

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* Corresponding authors

^a Fujian Provincial Key Laboratory of Semiconductors and Applications, Collaborative Innovation Center for Optoelectronic Semiconductors and Efficient Devices, Department of Physics, Xiamen University, Xiamen 361005, P. R. China
E-mail: jykang@xmu.edu.cn

^b Department of Mechanical Engineering and the Materials Science and Engineering Program, The University of Texas at Austin, Austin, Texas 78712, USA
E-mail: yh2682@columbia.edu, ruofflab@gmail.com

^c Department of Mechanical Engineering, Columbia University, New York, New York, USA

^d Department of Materials Science and Engineering, the Pennsylvania State University, University Park, PA, USA

^e Center for Multidimensional Carbon Materials and Department of Chemistry and School of Materials Science Ulsan National Institute of Science and Technology (UNIST), Ulsan, South Korea

Abstract

During the chemical vapor deposition (CVD) growth of graphene on Cu foils, evaporation of Cu and changes in the dimensions of Cu grains in directions both parallel and perpendicular to the foils are induced by thermal effects. Such changes in the Cu foil could subsequently change the shape and distribution of individual graphene domains grown on the foil surface, and thus influence the domain structure and electrical properties of the resulting graphene films. Here, a slower cooling rate is used after the CVD process, and the graphene films are found to have an improved electrical performance, which is considered to be associated with the Cu surface evaporation and grain structure changes in the Cu substrate.

Nanoscale

Effects of thermally-induced changes of Cu grains on domain structure and electrical performance of CVD-grown graphene

Abstract

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Effects of thermally-induced changes of Cu grains on domain structure and electrical performance of CVD-grown graphene

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