Research on the Bouncing-Ball Based Triboelectric Nanogenerator for Self-powered Vibration Frequency Monitoring. - Xusheng Zuo; Taili Du; Fangyang Dong; Shunqi Li; Yongjiu Zou; Junhao Zhao; Peng Zhang; Yuewen Zhang; Peiting Sun; Minyi Xu (NEMS, 2021)