Journal
JOURNAL OF PHYSICAL CHEMISTRY C
Volume 124, Issue 50, Pages 27780-27789Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acs.jpcc.0c08444
Keywords
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Funding
- General Project of Natural Science Foundation of Chongqing Science and Technology Bureau [cstc2020jcyj-msxm0673]
- Science and Technology Research Program of Chongqing Munic ipal Education Commi ssion [KJQN201901417, KJQN201801409]
- Support Programme for Growth of Young Scientific Research Talents of Yangtze Normal University [0107/010721064]
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High dielectric constant and breakdown strength are crucial for high-energy-density polymer/ceramic composites. Anatase-TiO2 with low dielectric constant and V2C MXene with high work function are not satisfactory fillers. In the present work, V2C-TiO2 hybrid filler was in situ synthesized, followed by fabricating poly(vinylidene fluoride) (PVDF)/V2C-TiO2 composites via solution cast. Compared with PVDF/TiO2 and PVDF/V2C composites, PVDF/V2C-TiO2 composites have an improved high dielectric constant, depressed low dielectric loss, and maintained high breakdown strength. High overall electric traits are ascribed to the synergy of conductive V2C and semiconductive TiO2. Outer and inner surfaces of V2C were ornament-combined by anatase-TiO2 particles having surface point defects as electron traps, contributing to low interface leakage conduction. Through density functional theory (DFT) calculations, nontypical V-F-Ti-bonding-induced dipole enhancement and Fermi-level (E-F) overlapping-induced high electron localization mechanisms improve the dielectric response. Ternary composite with 10 wt % hybrid filler exhibits a dielectric constant of similar to 99, a dielectric loss of similar to 0.24 at 1 kHz, and a breakdown strength of similar to 189 MV/m. This work might enable large-scale preparation of promising polymer/MXene composite dielectrics.
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