Abstract
Piezoelectric nanogenerators are composite nanostructure films with a capability of the mechanical-to-electrical energy conversion for potential applications in self-sustained, low-powered electronic devices. In this work, Zinc Oxide (ZnO) nanorods served as piezoelectric materials and they were grown by two steps: (1) Spray Pyrolysis and (2) Hydrothermal Method on copper foils. Afterwards, poly (vinylidene difluoride) (PVDF) was spin-coated on ZnO nanorods with a spinning speed of 500 rpm. After spin-coating, the PVDF films were either air-cooled or heated at 100 °C for 10 min. Piezoelectric Force Microscopy (PFM) was performed to investigate the piezoelectric and ferroelectric behaviour of PVDF and the increment of piezoelectric response by adding ZnO nanorods to PVDF. Then, the ZnO film, pristine PVDF film and ZnO-PVDF were assembled with Al foil on top to construct nanogenerators for comparison. Lastly, the measurement of electric output voltage was carried out using energy conversion circuit.
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