Piezoelectric properties of cellular polypropylenepiezoelectrets used as air-coupled ultrasonic transducers
LIU Jiawen, QIU Xunlin, BIAN Yuqing, Zhu Wujun, XIANG Yanxun
Jorunal of Functional Materials . 2023, (9): 9133 -9137 .  DOI: 10.3969/j.issn.1001-9731.2023.09.016