Recent Advances in Self-Powered Piezoelectric and Triboelectric Sensors: From Material and Structure Design to Frontier Applications of Artificial Intelligence. - Zetian Yang; Zhongtai Zhu; Zixuan Chen; Mingjia Liu; Binbin Zhao; Yansong Liu; Zefei Cheng; Shuo Wang; Weidong Yang; Tao Yu (Sensors, 2021)