Highly Transparent and Adhesive Poly(vinylidene difluoride)Films for Self-Powered Piezoelectric Touch Sensors

作     者：Qing-Qing Li Guang-Kuo Wang Zi-Xu Liang Zhi-Jun Hu Qing-Qing Li;Guang-Kuo Wang;Zi-Xu Liang;Zhi-Jun Hu

作者机构：School of Optoelectronic Science and Engineering&Collaborative Innovation Center of Suzhou Nano Science and TechnologySoochow UniversitySuzhou215006China Center for Soft Condensed Matter Physics and Interdisciplinary ResearchSoochow UniversitySuzhou215006China Soochow UniversityKey Lab of Advanced Optical Manufacturing Technologies of Jiangsu Province&Key Lab of Modern Optical Technologies of Education Ministry of ChinaSuzhou215006China 

出 版 物：《Chinese Journal of Polymer Science》 (高分子科学（英文版）)

年 卷 期：2022年第40卷第7期

页      面：726-737页

核心收录：

学科分类：07[理学] 070205[理学-凝聚态物理] 08[工学] 080202[工学-机械电子工程] 0805[工学-材料科学与工程（可授工学、理学学位）] 0802[工学-机械工程] 0703[理学-化学] 0702[理学-物理学] 

基　　金：financially supported by the National Natural Science Foundation of China(Nos.51973150,51473112 and 21674076) the Natural Science Foundation of the Jiangsu Higher Education Institutions of China(No.19KJA320009) a Project funded by the Priority Academic Program Development of Jiangsu Higher Education Institutions(PAPD)。 

主　　题：PVDF Transparent Adhesive Large scale Piezoelectric sensor 

摘      要：With the rapid development of internet of things,self-powered touch sensors made of piezoelectric fluorinated polymers have attracted significant interest because they can constantly convert mechanical energy into electrical energy without external power supply.However,it is still challenging to fabricate fluorinated polymer films with good adhesion and high output performance with a large-scale and low-cost method while maintaining high transparency,which are extremely important for simultaneous optical detection and electromechanical transduction.In this work,we demonstrate that the incorporation of a molecular ferroelectric-dabcoHReO_(4)(DH)into poly(vinylidene difluoride)(PVDF)solution enables high-throughput and low-temperature processing of flexible and transparent piezoelectric films by scalable processing method.The effects of multiaxial DH are multiple.First,DH can trigger the phase transition of PVDF fromα-toβ-phase and realize the orderly orientation of PVDF,which guarantees higher piezoelectric performance without any additional electrical poling process.Second,the hydrophilic nature of DH can improve the adhesion properties of PVDF,which in turn improve the stability and durability of the devices.By optimizing the fabrication processes,the transmittance of the piezoelectric touch sensors based on PVDF films and Ag nanowires coated poly(ethylene terephthalate)electrodes can be higher than 94%.The piezoelectric voltage constant g;of the transparent films can reach to 1.2 V·m·N;,which is at least three times higher than the commercially available PVDF films obtained by stretching.These results indicate that the flexible piezoelectric sensors have potential applications in transparent electronic devices for mechanical sensing and energy harvesting.