▎ 摘　　要

Herein, we report the paddy-straw-derived graphene quantumdots(GQDs)-reinforced vertical-aligned two-dimensional (2D) ZnO nanosheet-basedflexible triboelectric nanogenerator (FTNG) for scavenging mechanicalenergy for the first time. The GQDs (diameter similar to 5-7 nm)and ZnO nanosheets were grown using a hydrothermal method and seed-assistedchemical route, respectively. The X-ray diffraction and electron microscopyresults confirmed the formation of a hexagonal wurtzite crystal structureand vertical-aligned morphology of 2D ZnO nanosheets. The GQD-reinforcedZnO-nanosheet-based FTNG device generated an output voltage of 40V and current density of 2 mu A/cm(2), respectively,whereas pristine vertical-aligned ZnO-nanosheet-based device producedan output voltage of only 16 V and a current density of 0.36 mu A/cm(2), respectively. The performance of the GQD-ZnO nanosheet FTNGdevice was also measured under illumination of the UV light, and adrastic increase in the output voltage is observed as compared toa pristine ZnO-nanosheet-based device. The GQD-reinforced ZnO nanosheetsexhibited very high dielectric constant of 40 at low frequency side.The current finding suggested a novel approach to efficiently harvestmechanical energy and a novel method to fabricate the self-poweredUV sensors and tribotronics devices using agrowaste-derived GQDs andZnO nanosheets.