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Photograph of graphene patterned into a shape of the letters “CSIG” by using concentrated solar radiation on (A) banana peel, (B) cantaloupe peel, (C) coconut peel, and (D) orange peel. (E) Photograph of graphene patterned into 12 interdigital electrodes with a line width of ∼2 mm on cantaloupe peel by using concentrated solar radiation. Raman spectra of CSIG were derived from (F) banana peel, (G) cantaloupe peel, (H) coconut peel, and (I) orange peel.
