Electrochemical delamination of CVD-grown graphene film: toward the recyclable use of copper catalyst.
The separation of chemical vapor deposited (CVD) graphene from the metallic catalyst it is grown on, followed by a subsequent transfer to a dielectric substrate, is currently the adopted method for device fabrication. Most transfer techniques use a chemical etching method to dissolve the metal catalysts, thus imposing high material cost in large-scale fabrication. Here, we demonstrate a highly efficient, nondestructive electrochemical route for the delamination of CVD graphene film from metal surfaces. The electrochemically delaminated graphene films are continuous over 95% of the surface and exhibit increasingly better electronic quality after several growth cycles on the reused copper catalyst, due to the suppression of quasi-periodical nanoripples induced by copper step edges. The electrochemical delamination process affords the advantages of high efficiency, low-cost recyclability, and minimal use of etching chemicals.
Department of Chemistry, National University of Singapore, 3 Science Drive 3, 117543 Singapore.
Yu
Y
Wang
Yi
Y
Zheng
Xiangfan
X
Xu
Emilie
E
Dubuisson
Qiaoliang
Q
Bao
Jiong
J
Lu
Kian Ping
KP
Loh
D002384:Catalysis; D003300:Copper / Q000737:chemistry* / Q000302:isolation & purification*; D004563:Electrochemistry / Q000379:methods*; D005740:Gases / Q000737:chemistry; D006108:Graphite / Q000737:chemistry*; D008567:Membranes, Artificial; D059027:Recycling / Q000379:methods*
D005740:Gases; D008567:Membranes, Artificial; D006108:Graphite; D003300:Copper