High-performance BCTZ nanowires-based energy harvesting device and self-powered bio-compatible flexion sensor

With excellent piezoelectric properties , (Ba 0.85 Ca 0.15 )(Ti 0.9 Zr 0.1 )O 3 (BCTZ) has been widely used in actuators, capacitors, sensors, etc. In this work, we fabricated BCTZ nanowires (NWs) by using sol-gel based electrospinning technique . By applying plate-electrode and parallel-electrode collectors, random BCTZ NWs (R-NWs) and well-aligned BCTZ NWs (A-NWs) were obtained. X-ray diffraction and high resolution transmission electron microscopy indicated that the NWs have good crystallinity . Furthermore, two flexible energy harvesting devices (EHDs) based on A-NWs and R-NWs were fabricated and their piezoelectric properties were measured. Under a load resistance of 1   MΩ, the output power of the R-NWs-based EHD is only ~0.95   μW while that for A-NWs-based EHD can reach up to ~2   μW, which can easily light a commercial light-emitting diode. Finally, we further demonstrated that the EHD could function as a non-invasive self-powered bio-compatible flexion sensor to apperceive the human knuckle flexion/extension movements.