RESEARCH ON THE EFFECT OF SPINCOATING PROCESS ON FERROELECTRIC PHASE OF PVDF-Tr FE/Zn O FILM
作者单位：College of Materials Science and Engineering North University of China College of Mechatronic Engineering North University of China
会议名称：《2016年全国压电和声波理论及器件应用研讨会》
会议日期：2016年
学科分类：080801[工学-电机与电器] 0808[工学-电气工程] 08[工学] 0805[工学-材料科学与工程（可授工学、理学学位）] 080502[工学-材料学]
基 金：supported by Shanxi Province science and technology project (Grant No. 2015031007-4) National Natural Science Foundation of China (Grant No. 51272301, 51172214, U1510125) Education Department of Shanxi Province, on publicity 2016 graduate education innovation project
关 键 词：Ferroelectric phase Spin-coating Nano-ZnO Crystallization Annealing temperature
摘 要：Background, Motivation and Objective Owing to their remarkable piezoelectric and ferroelectric properties, Poly(vinylidene fluoride)(PVDF) and the family of P(VDF-Tr FE) [Tr FE = trifluoroethylene] copolymers are the best-known candicates of a class of high-performance polymers. A host of techniques have been utilized during the preparation process for the sake of dipole alignment in the crystalline structure, trying to achieve ferroelectric phase(i.e., β-phase) of PVDF, including uniaxial or biaxial stretching, high electric field, thermal annealing, and also fillers. On the other hand, widely applied in micro-nano devices, zinc oxide(Zn O), as a semiconductor with wide band gap, demonstrates superior performance, including great piezoelectric characteristic. Given these views above, however, only few studies are focused on systems with Zn O embedded in PVDF-Tr FE, especially on the films prepared via a spin-coating process. Therefore, it is of remarkable necessity to gain a clear idea of the key issue which has the primary influence on the ferroelectric phase of that composite film. Statement of Contribution/Methods In this work, PVDF-Tr FE powder was dissolved in DMF at a concentration of 0.20 g/ml, under a vigorous stirring condition at room temperature for 1h. And the nano-Zn O gained by sol-gel method was dispersed in acetone under ultrasonic conditions, with 1.0 wt% eight vinyl –POSS(with the standard of theoretical yield of nano-Zn O) added. Ensuingly, a colorless clear solution and a uniform milky white suspension were obtained. Later on, we gained a kind of homogeneous mixing system like egg white after 90 minutes of intense agitation, with the mass ratio of 5 %( nano-Zn O/PVDF-Tr FE). Then the thin films were prepared by spin coating technology at different speeds(2000, 2500, 3000 r/min) on the PEN substrate coated with ITO, 0.3ml of blend solution each time. Ultimately, after an 1 hour annealing process at different temperatures(80, 100, 120℃) in vacuum