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a Schematic of the tellurene flexible nanogenerator (TFNG) device fabrication process. b Optical images of the TFNG devices in different states: flat, folded, and rolled. c, d Measurements of the output voltage and current due to periodic bending and unbending behavior. The insets show a single bending–unbending event. Adapted with permission from [183]. Copyright 2016, Elsevier
