文献类型：期刊文献

英文题名：Tuning dielectric properties and energy density of poly(vinylidene fluoride) nanocomposites by quasi core–shell structured BaTiO3@graphene oxide hybrids

作者：Li, Yunming[1,2,4]; Yang, Wenhu[3,5,6]; Ding, Shanjun[1]; Fu, Xian-Zhu[1]; Sun, Rong[1]; Liao, Wei-Hsin[6]; Wong, Ching-Ping[6]

机构：[1] Shenzhen Institutes of Advanced Technology, Chinese Academy of Sciences, Shenzhen, 518055, China; [2] Shenzhen College of Advanced Technology, University of Chinese Academy of Sciences, Shenzhen, 518055, China; [3] School of Electronics and Information Engineering, Guangdong Ocean University, Zhanjiang, 524088, China; [4] School of New Energy Science and Engineering, Xinyu University, Xinyu, 338004, China; [5] Shenzhen Research Institute of Guangdong Ocean University, Shenzhen, 518120, China; [6] Department of Mechanical and Automation Engineering, The Chinese University of Hong Kong, Shatin, 999077, Hong Kong

年份：2018

卷号：29

期号：2

起止页码：1082

外文期刊名：Journal of Materials Science: Materials in Electronics

收录：EI(收录号：20174104268149)

语种：英文

外文关键词：Dielectric devices - Fluorine compounds - Dielectric properties of solids - Electric breakdown - Barium titanate - Dielectric losses - Permittivity - Graphene

外文摘要：High energy density polymer-based nanocomposites have shown significant potential in modern electronic devices. However, it is still a great challenge to achieve high dielectric permittivity and low dielectric loss without compromising breakdown strength. Here, we report a facile synthesis of core–shell structured BaTiO3@graphene oxide (BT@GO) hybrids as fillers for enhanced energy density of dielectric polymer nanocomposites. The as-fabricated BT@GO/PVDF nanocomposites manifest high dielectric permittivity and low dielectric loss, as well as highly enhanced breakdown strength and maximum energy density. The nanocomposites filled with 20?wt% BT@GO display a dielectric permittivity value of 14 and dielectric loss of 0.04?at 1?kHz with high breakdown strength of 210?MV/m. As a result, the maximum energy density up to 3.88?J/cm3, which is about 1.6 and 2.1 times higher than that of BT/PVDF nanocomposites with the same mass fraction and neat PVDF, respectively. These well tuned properties are resulted from the novel structure of BT@GO and synergistic effect of the two constituents, which GO shells as buffer layers could effectively mitigate local electric field concentration for enhanced breakdown strength and BT as cores raised the dielectric permittivity. This work provides a potential design strategy based on graphene oxide interface engineering for developing dielectric polymer nanocomposites with high energy density. ? 2017, Springer Science+Business Media, LLC.