Generating electricity using graphene nanodrumsElectronic supplementary information (ESI) available: Synthesis of graphene; fabrication of nanopore array and device; Raman spectra of graphene; AFM images of individual graphene nanodrum; anisotropic coverage of graphene on individual nanopore; temperatures of two electrodes; voltage measurements. See DOI: 10.1039/c5ra00174a

A voltage is induced when grapheme nanodrums (a graphene membrane on a nanopore array in a silicon oxide substrate) upheave/sink. The magnitude of the induced voltage is closely related to the extent to which the graphene membrane is bent, while its sign depends on the upheaval/sinking movement of the graphene nanodrums. A voltage is induced when the graphene nanodrums move and its magnitude and sign depend on the upheaval/sinking of the nanodrums.