Key Laboratory of Inorganic Functional Material and Device, CAS Shanghai Institute of Ceramics, Chinese Academy of Sciences
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
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.