1. Han M, Wang H, Yang Y, Liang C, Bai W, Yan Z, Li H, Xue Y, Wang X, Akar B, Zhao H, Luan H, Lim J, Kandela I, Ameer GA, Zhang Y, Huang Y, Rogers JA, Three-dimensional piezoelectric polymer microsystems for vibrational energy harvesting, robotic interfaces and biomedical implants. Nature Electronics, 2019, 2: 26-35.