▎ 摘　　要

Herein, we report highly sensitive graphene quantum dot (GQDs) reinforced poly (vinylidene fluoride)co-hexafluoride propylene (PVDF-HFP) based flexible piezoelectric nanogenerator for the first time. Formation of b-phase in GQDs /PVDF-HFP composite film was confirmed using XRD diffraction and FTIR spectroscopy techniques. Flexible transparent piezoelectric nanogenerator fabricated from the GQDs/PVDF-HFP composite film exhibits very high output voltage of 6 V and output current of 25 nA compared to signal generated from pristine PVDF-HFP nanogenerator. The drastic improvement in the PVDF-HFP may be attributed to the alignment of electric dipoles induced by the local electric field cause by conductive GQDs. Performance of GQDs/PVDF-HFP has also been real time demonstrated as self powered human breathing and finger movement sensors which make it suitable for promising wearable energy harvester and for powering nanosystems. (c) 2021 Elsevier B.V. All rights reserved.