CONCLUSIONS
Well-aligned, vertical ZnO nanowires were grown on PET
substrates by the hydrothermal method at 95 °C. FE-SEM and
XRD measurements verified that they were highly uniform and
highly crystalline. We fabricated a novel piezoelectric nanogenerator
consisting of a ZnO nanowire and Pt/ZnO nanowire
electrode on the flexible PET substrate. The piezoelectric
nanogenerator sample with 2% bending exhibited a piezoelectric
current of approximately 2.5 × 10−9 A, suggesting that
the 2% bent sample caused internal stress in the PET substrate,
which output a current of around 5 × 10−10 A without a
vibration source.