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a) Fabrication process of the graphene earphone. b) Flexible graphene earphones in wafer‐scale. c) Color rendered SEM image of the LSG and GO. d) Electrical properties before and after laser scribing. e) Experimental setup and frequency characteristics of the graphene earphone. f) The testing of graphene earphones on the dog. Reproduced with permission.98 Copyright 2011, American Chemical Society.
