Efficient natural piezoelectric nanogenerator: Electricity generation from fish swim bladder

An efficient bio-piezoelectric nanogenerator (BPNG) is fabricated from the fish swim bladder (FSB), composed of well-aligned natural collagen nano fibrils. The self-alignment of highly ordered structure in the FSB collagen has been confirmed by angular dependent near edge X-ray absorption fine structure (NEXAFS) spectroscopy. Compressive normal stress by human finger can able to drive the BPNG that generates an open-circuit voltage of 10 V and short-circuit current of 51 nA. The generated electricity from the FSB instantly turns on more than 50 commercial blue light emitting diodes (LEDs), indicates to use as a sustainable power source in portable electronic devices where the bulky battery counterpart can be avoided. The instantaneous piezoelectric power generation (similar to 4.15 mu W/cm(2)) and substantial energy conversion efficiency (similar to 0.3%) of BPNG promises an emerging application, particularly to built self powered biomedical sensors because collagen itself one of the most abundant protein available in human body. (C) 2016 Elsevier Ltd. All rights reserved.