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Enhanced Crystallinity, Dielectric, and Energy Harvesting Performances of Surface‐Treated Barium Titanate Hollow Nanospheres/PVDF Nanocomposites
Author(s) -
Cho Sunghun,
Lee James Sangmin,
Jang Jyongsik
Publication year - 2015
Publication title -
advanced materials interfaces
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.671
H-Index - 65
ISSN - 2196-7350
DOI - 10.1002/admi.201500098
Subject(s) - materials science , crystallinity , dielectric , barium titanate , nanocomposite , composite material , capacitor , surface energy , dielectric loss , fluoride , chemical engineering , optoelectronics , voltage , inorganic chemistry , chemistry , physics , quantum mechanics , engineering
Enhancement of the energy harvesting performance and dielectric constants of poly(vinylidene fluoride) (PVDF)‐based capacitors is realized by incorporating 16 wt% of surface‐treated BaTiO 3 hollow nanospheres (HNSs) in comparison with the pristine PVDF. The fabricated BaTiO 3 HNSs with particle sizes of ≈20 nm and BET surface area of 297 m 2 g −1 are treated by three different surface modifiers. The changes in crystallinity of the PVDF containing the surface‐treated BaTiO 3 HNSs are induced by both enlarged surface areas and increased surface functionality of the HNSs. Effects of such surface functionalities on the crystalline, dielectric, and energy harvesting performances of the nanocomposites are systematically investigated to identify the optimal surface modifier to enhance the energy density of the nanocomposites. Consequently, these changes in crystallinity lead to higher dielectric constants ( ε ′ ≈ 109.6) and energy density ( U e ≈ 21.7 J cm −3 ) with highly retained breakdown strength ( E = 3.81 × 10 3 kV cm −1 ) compared to pristine PVDF ( ε ′ ≈ 11.6 and U e ≈ 2.16 J cm −3 at 3.98 × 10 3 kV cm −1 ), indicating their potential as high energy density capacitors.