Abstract
To get a dielectric material with a high dielectric permittivity and suppressed dielectric loss, nano-Ag with a particle size of 20 nm and Ag@TiO2 core-shell particles with diameters of approximately 70–120 nm were embedded in polyvinylidene fluoride (PVDF) to fabricate nano-Ag/Ag@TiO2/PVDF composites. After being modified by nano-Ag with 3 vol% optimal amount, the relative permittivity (εr) at 100 Hz of 50 vol% Ag@TiO2/PVDF composites was 61, and the dielectric loss can be suppressed to 0.04, almost 96.4% lower than that of unmodified composites, and a higher frequency stability of both εr and loss has also been found. The underlying mechanism of the reduced loss was attributed to Maxwell-Wagner polarization and the Coulomb blockade effect caused by the introduction of a small amount of nano-Ag, which will block the movement of electrons between metal nanoparticles and composites. The space charge polarization and conductance loss are weakened at lower and higher Ag@TiO2 filling ratios, respectively, thus leading to a very low loss of the composites.
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Funded by the National Natural Science Foundation of China (No. 51772107) and the Fundamental Research Funds for the Central Universities (No. 2017KFYXJJ022)
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Dai, J., Meng, S., Yang, C. et al. Effect of Nano Silver Modification on the Dielectric Properties of Ag@TiO2/PVDF Composites. J. Wuhan Univ. Technol.-Mat. Sci. Edit. 36, 303–310 (2021). https://doi.org/10.1007/s11595-021-2410-1
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DOI: https://doi.org/10.1007/s11595-021-2410-1