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Synthesis of Ag@Al2O3 core-shell structure nanoparticles and their enhancement effect on dielectric properties for Ag@Al2O3/polyimide nanocomposites

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Abstract

A novel core-shell structure Ag@Al2O3 nano-particles were synthesized and doped into polyimide as conductive fillers to prepare the composite films with high dielectric properties and low dielectric loss. The morphology and structures of the Ag@Al2O3 nano-particles were characterized by transmission electron microscopy (TEM), X-ray diffraction (XRD), and UV-visible spectroscopy. All the results proved that the Ag@Al2O3 nano-particles had a typical core-shell structure, for the Ag particles were coated by Al2O3 shell and the average sizes of Ag@Al2O3 particles were between 30 to 150 nm. The as-prepared Ag@Al2O3 nanoparticles were doped into the polyimide with different mass fractions to fabricate the Ag@Al2O3/PI composite films via in-situ polymerization process. SEM analysis of composite films showed that the Ag@Al2O3 nanoparticles homogeneously dispersed in polyimide matrix with nanoscale. As dielectric materials for electronic packaging systems, the Ag@Al2O3/PI composites exhibited appropriate mechanical properties and enhanced dielectric properties, including greatly enhanced dielectric constant and just a slight increase in dielectric loss. These improvements were attributed to the core-shell structure of fillers and their fine dispersion in the PI matrix.

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Authors and Affiliations

  1. Key Laboratory of Engineering Dielectrics and Its Application, Ministry of Education, Harbin University of Science and Technology, Harbin, 150080, China

    Ling Weng  (翁凌) & Lizhu Liu

  2. School of Materials Science and Engineering, Harbin University of Science and Technology, Harbin, 150040, China

    Ling Weng  (翁凌), Liwen Yan, Hongxia Li, Qianshan Xia & Lizhu Liu

Authors
  1. Ling Weng  (翁凌)
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  2. Liwen Yan
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  3. Hongxia Li
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  4. Qianshan Xia
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  5. Lizhu Liu
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Corresponding author

Correspondence to Ling Weng  (翁凌).

Additional information

Funded by the National Natural Science Foundation of China (No.51177030), the National Key Basic Research Development Plan (No.2012CB723308) and the Natural Science Foundation of Heilongjiang Province of China (No.E201224)

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Weng, L., Yan, L., Li, H. et al. Synthesis of Ag@Al2O3 core-shell structure nanoparticles and their enhancement effect on dielectric properties for Ag@Al2O3/polyimide nanocomposites. J. Wuhan Univ. Technol.-Mat. Sci. Edit. 30, 47–50 (2015). https://doi.org/10.1007/s11595-015-1098-5

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  • DOI: https://doi.org/10.1007/s11595-015-1098-5

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