Abstract
Developing polymer dielectrics with a low dielectric loss but high dielectric permittivity (ε′) and breakdown strength (Eb) is constantly pursued for applications in microelectronics and electrical industries. In this work, nickel (Ni) powders were coated by a layer of insulating aluminum oxide (Al2O3) via a facile sol–gel process, and the obtained core–shell Ni@Al2O3 particles were admixed into poly(vinylidene fluoride) (PVDF) to study the impacts of the Al2O3 shell and its thickness on dielectric properties of the composites. The results verify the formation of the insulating Al2O3 layer on the surface of the Ni core, which obviously enhances interfacial compatibility and interactions between the matrix and the fillers. The Ni@Al2O3/PVDF composites show better dielectric performances compared with the pristine Ni/PVDF. The dramatically suppressed dielectric loss and conductivity can be attributed to the insulating Al2O3 interlayer avoiding the Ni cores from direct contact with each other and blocking the long-range migration of electrons. Furthermore, the Al2O3 shell serves as an interlayer which lessens the distortion and concentration of local electric field subsequently leading to enhanced Eb. Thus, the dielectric properties of the Ni@Al2O3/PVDF composites can be effectively tuned through finely tailoring the Al2O3 shell’s thickness. The developed Ni@Al2O3/PVDF composites with high Eb and ε′ but low dielectric loss have potential applications in the microelectronic and electrical industries.
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Funding
This work was supported by the National Natural Science Foundation of China (Nos. 51937007, 51903207); Priority Research and Development Foundations of Shaanxi Provincial Government (2021GY-215); PhD Early Development Program of Xi’an University of Science and Technology (2019QDJ010), and has received research support from the Analytic Instrumentation Center of XUST.
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All authors contributed to the study conception and design. Material preparation, data collection, and analysis were performed by WZ, YL, and PL. Characterization and related discussion were performed by TY, JL, JZ, and JC. Funding acquisition and Project administration were performed by WZ, YL. The first draft of the manuscript was written by GC and all authors commented on previous versions of the manuscript. All authors read and approved the final manuscript.
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Cao, G., Zhou, W., Li, Y. et al. Suppressed dielectric loss and enhanced breakdown strength in Ni/PVDF composites through constructing Al2O3 shell as an interlayer. J Mater Sci: Mater Electron 33, 9951–9965 (2022). https://doi.org/10.1007/s10854-022-07987-3
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DOI: https://doi.org/10.1007/s10854-022-07987-3