文献类型：期刊文献

英文题名：BaTiO3 Nanoparticles Coated with Polyurethane and SiO2 for Enhanced Dielectric Properties

作者：Wang, Xinhua[1];Yuan, You[1];Chen, Donglin[1];Sun, Bowen[1];Qian, Jun[1];Liu, Xiaoyun[1];Zuo, Peiyuan[1];Chen, Yi[1,2];Zhuang, Qixin[1]

机构：[1]East China Univ Sci & Technol, Sch Mat Sci & Engn, Key Lab Special Funct Polymer Mat & Related Techno, Minist Educ, Shanghai 200237, Peoples R China;[2]Shanghai Spaceflight Precis Machinery Inst, Shanghai 201108, Peoples R China

年份：2023

卷号：6

期号：4

起止页码：2615

外文期刊名：ACS APPLIED NANO MATERIALS

收录：;EI(收录号：20230613567235);WOS:【SCI-EXPANDED(收录号:WOS:000930556000001)】；

基金：? ACKNOWLEDGMENTS This work was supported by the National Natural Science Foundation of China (52073091, 2171086) , the Natural Science Foundation of Shanghai (20ZR1414600) , and the Fundamental Research Funds for the Central Universities (JKD01221701) . This work was also sponsored by the Shanghai Pujiang Program (22PJ1402500) .

语种：英文

外文关键词：core-double shell structure; dielectric nanocomposites; hierarchical structure; flexible segments; COMSOL simulation

摘要：Core-shell structures are commonly employed in dielectric nanocomposites to improve the energy storage capacity of polymers. However, few studies have focused on organic-inorganic double-layered shell structures. Thus, there is an urgent need to elucidate the detailed effects of the flexible segment of polymer shells and inorganic shells on the dielectric properties. Herein, we synthesized a hierarchical core-double shell BT/PU/SiO2 nanofiller with a thickness of 3-5 nm PU and 15 nm SiO2 layers. This unique shell structure possesses a gradient permittivity that regularly decreases from the inside to the outside of shells. Detailed electrical characterizations reveal that the intermediate PU shell with shorter flexible segments can limit the carrier migration and thus decrease the dielectric loss. The interfacial polarization in double-layered BT/PU/SiO2 is beneficial to improve the dielectric constant of the as-prepared nanocomposites. COMSOL Multiphysics simulation results also confirm that the delicate structure enables the internal electric field more homogeneous, which enhances the breakdown strength owing to its gradient dielectric constant. In addition, the dielectric loss of BT/PU/SiO2-PVDF is 0.032 when the filling is < 4 wt %, which is only 45% compared with that of BT-PVDF. Meanwhile, the energy density of the nanocomposite reaches 7.41 J cm(-3), which is 1.74 times higher than that of pure PVDF (2.7 J cm(-3)). Accordingly, our current work provides insight into the design of hierarchical core-double shell nanoparticles and their derived polymer nanocomposite capacitors for high-energy-density storage applications.