Synthesis of shape-tunable PbZrTiO<sub>3</sub> nanocrystals with lattice variations for piezoelectric energy harvesting and human motion detection
Ya-Ju Chuang, Arnab Pal, Bo‐Hao Chen, Satyaranjan Jena, Sreerag Suresh, Zong‐Hong Lin, Michael H. Huang
Abstract
crystals give size- and composition-dependent band gaps. Cuboids show notably larger piezoelectric and ferroelectric responses than cubes. Piezoelectric nanogenerators (PENGs) containing 30 wt% cuboids produce the highest open-circuit voltage of 20.36 V and short-circuit current of 2300 nA. The PENGs harvest energy through bending/releasing cycles to power devices and show photothermal pyroelectric activity. Moreover, a single 30 wt% cuboid PENG device integrated into a shoe insole can deliver an impressive 96.8% accuracy for human motion detection using a machine learning approach. This work illustrates that considerable lattice variation through crystal shape control is effective in enhancing material properties.