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ACS Nano. 2011 Dec 27;5(12):9927-33. doi: 10.1021/nn203700w. Epub 2011 Nov 4.

Electrochemical delamination of CVD-grown graphene film: toward the recyclable use of copper catalyst.

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Department of Chemistry, National University of Singapore, 3 Science Drive 3, 117543 Singapore.


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.

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