Key Laboratory of Inorganic Functional Material and Device, CAS Shanghai Institute of Ceramics, Chinese Academy of Sciences
中国科学院无机功能材料与器件重点实验室

SEMINAR
Exploration and application of advanced multi-phase materials for bipolar electrets with high piezoelectric sensitivity

Speaker: Xunlin Qiu (邱勋林)
Chemnitz University of Technology，Germany

报告时间：2019年1月4日（星期五）10: 00
报告地点：F6第2会议室
联系人：李国荣 研究员

欢迎广大科研人员和研究生参加！

报告简介：
The demand for advanced functional materials in transducer technology is growing rapidly. Piezoelectric materials transform mechanical variables (displacement or force) into electrical signals (charge or voltage) and vice versa. They are suitable for a large range of existing or conceivable applications in e.g. non-destructive testing, medical imaging, ultrasonic sensors for ocean exploration. A charge-spring model for multi-phase piezoelectric materials is introduced, which sheds light on the requirements for a desired piezoelectric material. As a new paradigm of multi-phase piezoelectric material, cellular polymer ferroelectrets combine the respective advantages of piezoelectric ceramics (high piezoelectricity) and polymers (mechanical compliance and flexibility), and therefore have attracted tremendous interest in the field. In this talk, the techniques for preparing such polymer foams, the mechanisms of charging and of the resulting piezoelectricity of ferroelectrets are presented. In addition, some examples of relevant applications are demonstrated.