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Schematic illustration and characterization of carbon-coated paper wipes (PWs). (a) Schematic diagram to illustrate the fabrication of carbon-coated discarded PWs (C@PWs), as well as the TENG realized with these PWs and discarded plastic cups. FE-SEM images of PWs at different magnifications, (b) before and (c) after coating with the carbon NPs. (d) XRD and (e) Raman spectra analysis of bulk carbon NPs and C@PWs.
