Effect of Nano Silver Modification on the Dielectric Properties of Ag@TiO_(2)/PVDF Composites

作     者：DAI Jinhang MENG Shunliang YANG Chuntian Lv Wenzhong CHEN Xizi YIN Yuhao LIANG Fei 戴金航;MENG Shunliang;YANG Chuntian;Lv Wenzhong;CHEN Xizi;YIN Yuhao;梁飞

作者机构：Key Laboratory of Functional Materials for Electronic Information(B)Ministry of EducationHuazhong University of Science and TechnologyWuhan 430074China Wenzhou Institute of Industrial ScienceWenzhou 325028China Huawei Technologies Co.Ltd.Shenzhen 518116China 

出 版 物：《Journal of Wuhan University of Technology(Materials Science)》 (武汉理工大学学报（材料科学英文版）)

年 卷 期：2021年第36卷第3期

页      面：303-310页

核心收录：

学科分类：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：Funded by the National Natural Science Foundation of China(No.51772107) the Fundamental Research Funds for the Central Universities(No.2017KFYXJJ022) 

主　　题：polymer composites dielectric properties AC impedance spectrum Ag@TiO_(2)/PVDF coulomb blockade effect 

摘      要：To get a dielectric material with a high dielectric permittivity and suppressed dielectric loss,nano-Ag with a particle size of 20 nm and Ag@TiO_(2)core-shell particles with diameters of approximately 70-120 nm were embedded in polyvinylidene fluoride(PVDF)to fabricate nano-Ag/Ag@TiO_(2)/PVDF *** being modified by nano-Ag with 3 vol%optimal amount,the relative permittivity(ε_r)at 100 Hz of 50 vol%Ag@TiO_(2)/PVDF composites was 61,and the dielectric loss can be suppressed to 0.04,almost 96.4%lower than that of unmodified composites,and a higher frequency stability of bothε_r and loss has also been *** underlying mechanism of the reduced loss was attributed to Maxwell-Wagner polarization and the Coulomb blockade effect caused by the introduction of a small amount of nano-Ag,which will block the movement of electrons between metal nanoparticles and *** space charge polarization and conductance loss are weakened at lower and higher Ag@TiO_(2)filling ratios,respectively,thus leading to a very low loss of the composites.