1.6 V Nanogenerator for Mechanical Energy Harvesting Using PZT Nanofibers

Energy harvesting technologies that are engineered to miniature sizes, while still increasing the power delivered to wireless electronics,(1,2) portable devices, stretchable electronics,(3) and implantable biosensors,(4,5) are strongly desired. Piezoelectric nanowire- and nanofiber-based generators have potential uses for powering such devices through a conversion of mechanical energy into electrical energy. However, the piezoelectric voltage constant of the semiconductor piezoelectric nanowires in the recently reported piezoelectric nanogenerators(7-12) is lower than that of lead zirconate titanate (PZT) nanomaterials. Here we report a piezoelectric nanogenerator based on PZT nanofibers. The PZT nanofibers, with a diameter and length of approximately 60 nm and 500 mu m, were aligned on interdigitated electrodes of platinum fine wires and packaged using a soft polymer on a silicon substrate. The measured output voltage and power under periodic stress application to the soft polymer was 1.63 V and 0.03 mu W, respectively.