Beijing Institute of Nanoenergy and Nanosystems , Chinese Academy of Sciences , Beijing 100083 , P. R. China.
School of Nanoscience and Technology , University of Chinese Academy of Sciences , Beijing 100049 , P. R. China.
ACS Appl Mater Interfaces. 2018 Aug 1;10(30):25683-25688. doi: 10.1021/acsami.8b05966. Epub 2018 Jul 18.
Core-shell-structured BaTiO-poly( tert-butyl acrylate) (P tBA) nanoparticles are successfully prepared by in situ atom transfer radical polymerization of tert-butyl acrylate ( tBA) on BaTiO nanoparticle surface. The thickness of the P tBA shell layer could be controlled by adjusting the feed ratio of tBA to BaTiO. The BaTiO-P tBA nanoparticles are introduced into poly(vinylidene fluoride) (PVDF) matrix to form a BaTiO-P tBA/PVDF nanocomposite. The nanocomposites keep the flexibility of the PVDF matrix with enhanced dielectric constant (∼15@100 Hz) because of the high permittivity of inorganic particles and the ester functional groups in the P tBA. Furthermore, the BaTiO-P tBA/PVDF nanocomposites demonstrate the inherent small dielectric loss of the PVDF matrix in the tested frequency range. The high electric field dielectric constant of the nanocomposite film was investigated by polarization hysteresis loops. The high electric field effective dielectric constant of the nanocomposite is 26.5 at 150 MV/m. The output current density of the nanocomposite-based triboelectric nanogenerator (TENG) is 2.1 μA/cm, which is above 2.5 times higher than the corresponding pure PVDF-based TENG.
核壳结构的 BaTiO-聚（叔丁基丙烯酸酯）（P tBA）纳米粒子是通过在 BaTiO 纳米粒子表面原位原子转移自由基聚合叔丁基丙烯酸酯（tBA）成功制备的。通过调整 tBA 与 BaTiO 的进料比可以控制 P tBA 壳层的厚度。将 BaTiO-P tBA 纳米粒子引入聚偏二氟乙烯（PVDF）基体中，形成 BaTiO-P tBA/PVDF 纳米复合材料。由于无机粒子的高介电常数和 P tBA 中的酯官能团，纳米复合材料保持了 PVDF 基体的柔韧性，介电常数得到增强（约 15@100 Hz）。此外，在测试的频率范围内，BaTiO-P tBA/PVDF 纳米复合材料表现出 PVDF 基体固有的小介电损耗。通过极化滞后环研究了纳米复合材料薄膜的高电场介电常数。纳米复合材料的高电场有效介电常数在 150 MV/m 时为 26.5。基于纳米复合材料的摩擦电纳米发电机（TENG）的输出电流密度为 2.1 μA/cm，比相应的纯 PVDF 基 TENG 高 2.5 倍以上。
