清華大學材料科學與工程研究院《材料科學論壇》

學術報告

報告題目：Piezoelectric Polymers and Ceramic-Polymer Nanocomposites

報告人：Prof. Qing Wang (Department of Materials Science and Engineering, The Pennsylvania State University, University Park )

報告時間：2019年5月13日（周一） 下午4:00

報告地點：清華大學逸夫技術科學樓A205學術報告廳

聯系人：林元華老師 62773741

歡迎廣大師生踴躍參加！

報告摘要：
Flexible piezoelectric materials are pivotal to a variety of emerging applications ranging from wearable electronic devices, sensors to biomedical devices. In this talk, I will present our latest results on the scalable ferroelectric ceramic-polymer composites based on three-dimensional (3-D) interconnected microfoams. The 3-D polymer composite exhibits exceptional piezoelectric characteristics under multiple loading conditions (i.e., compression, stretching, and bending) and high mechanical durability under thousands of cycles. The 3-D polymer composite also displays excellent pyroelectricity, thereby enabling concurrent thermal and mechanical energy scavenging. In addition, I will present our efforts on the development of the ferroelectric polymers exhibiting the state-of-the-art piezoelectric coefficient based on the concept of morphotropic phase boundary (MPB). Our work represents the discovery of MPB in the ferroelectric polymers and provides a unique molecular engineering approach to MPB. We have also successfully addressed the controversies in the fundamental understandings of the origin of piezoelectricity in ferroelectric polymers, which has plagued the field despite extensive studies during the past decades.