Using vertically grown hydrothermal ZnO nanowires, we demonstrate the assembly of fully functional piezoelectric energy harvesters on plastics substrates. A seedless hydrothermal process is employed for the growth of single crystalline vertically orientated ZnO NWs at around 100oC. Flexible NG are assembled using ∼7 μm thick PDMS polymer matrix on a 3x3cm substrate. A representative device with an active area of 4cm2 is characterised revealing average output voltage generation of ∼22mV (±1.2) and -32mV (±0.16) in the positive and negative cycles after 3-4mm periodic deflection at 20Hz. A power density of ∼288nW/cm3 is estimated for the device. It is envisaged that such energy scavengers may find potential applications targeting self-powered systems, sensors and on-body charging of electronics.
Opoku, C., Dahiya, A. S., Oshman, C., Cayrel, F., Poulin-Vittrant, G., Alquier, D., & Camara, N. (2015). Fabrication of ZnO nanowire based piezoelectric generators and related structures. In Physics Procedia (Vol. 70, pp. 858–862). Elsevier. https://doi.org/10.1016/j.phpro.2015.08.176