Portable Self-Powered Piezoelectric Nanogenerator and Self-Charging Photo-Power Pack Using In Situ Formed Multifunctional Calcium Phosphate Nanorod-Doped PVDF Films

Herein, biocompatible Ca-3(PO4)(2) nanorod-incorporated poly(vinylidene) difluoride films have been prepared via an in situ process. A good piezoelectricity (d(33) approximate to 56.6 pC/N) along with a large dielectric constant of similar to 3.48 X 10(5) at frequency 20 Hz has been achieved. Then, we have designed a biocompatible, highly durable, low-cost piezoelectric nanogenerator (CPNG) which shows the superiority in open-circuit voltage similar to 47 V and current similar to 1.8 mu A generation with power density similar to 47.4 mW cm(-3) under the gentle touch of a finger. Excellent mechanical to electrical energy conversion efficiency (similar to 65.5%) of our developed CPNG leads to fast charging of a capacitor of 1 mu F in 18 s and glowing of 26 light-emitting diodes (LEDs) under finger impartation. Further, a portable light-charging power pack (LCPP) has been developed using the high dielectric film as the storage function. Under light illumination, our LCPP generates open-circuit output voltage similar to 1.29 V with short-circuit current 5.7 mA cm(-2). Areal capacitance similar to 1779 F m(-2) and storage efficiency similar to 88% are achieved. The device is able to lighten up 22 LEDs for 10 days after charging once.