文献类型：期刊文献

英文题名：Highly Stretchable Multiphase Composite Piezoelectret with Large Longitudinal and Transverse Piezoelectric Sensitivity for Self-powered Electromechanical Sensors

作者：Lyu, Yanfeng[1]; Gao, Tiantian[1]; Li, Jian[1]; Hu, Zheng[1]; Qiu, Xunlin[1]; Xiang, Yanxun[1]; Xuan, Fu-Zhen[1]; Gan, Wee Chen[2]; Auhl, Dietmar[3]

机构：[1] East China University of Science and Technology, Shanghai Key Laboratory of Intelligent Sensing and Detection Technology, School of Mechanical and Power Engineering, Shanghai, 200237, China; [2] Xiamen University Malaysia, School of Energy and Chemical Engineering, Selangor Darul Ehsan, 43900, Malaysia; [3] Technische Universit?t Berlin, Department of Polymer Materials and Technologies, Berlin, D-10587, Germany

年份：2026

外文期刊名：IEEE Sensors Journal

收录：EI(收录号：20263221247673);Scopus(收录号：2-s2.0-105046427775)

语种：英文

外文关键词：Crystallography - Electromechanical devices - Man machine systems - Piezoelectric transducers - Wearable sensors

摘要：Stretchable piezoelectric sensors are highly desired in application fields such as wearable electronics, advanced robotics and human-machine interface (HMI). In this paper, we report a highly flexible and stretchable multiphase composite piezoelectret (MPCP) with large longitudinal and transverse piezoelectric sensitivity for self-powered wearable electromechanical sensor. The sensor is composed of a patterned FEP electret film with tubular concave channels, a stretchable PDMS elastomer layer and stretchable top and bottom electrodes. Our results show that the developed piezoelectret sensor exhibits large effective longitudinal (d33) and transverse (d31) piezoelectric coefficients of 250 pC/N and 200 pC/N, respectively. The combination of the patterned FEP film and the PDMS elastic substrate enables a large stretchability of 30% for the MPCP sensor. In addition, the sensor has excellent durability, maintaining more than 93% of the initial piezoelectric sensitivity after 10,000 stretching cycles. The sensor can accurately detect weak physiological mechanical signals such as radial arterial pulses. It is also demonstrated that the MPCP sensor, conformally attached to human joints, effectively captures the angle, frequency, and speed of joints bending. This work paves the way for preparation of customized MPCPs with high piezoelectric sensitivity and large stretchability for flexible sensors used in biomechanical monitoring, human-machine interface, etc. ? 2001-2012 IEEE.