The Ag@SiO2 core-shell structure nanoparticles prepared by chemical method were dispersed into epoxy matrix. By comparing with the epoxy-based composites filled with the mixed Ag and SiO2 nanoparticles (Ag + SiO2), it is found that the Ag@SiO2 core-shell structure fillers had important effects on the improved dielectric properties of the Ag@SiO2/epoxy composites. The core-shell structure fillers introduce a duplex interfacial polarization and a small number of free charge carriers, which enhance the dielectric permittivity of the composites. At the same time, the insulating SiO2 shell layer changes the interfacial interaction between the Ag filler and the epoxy matrix, not only avoiding Ag particles to connect directly and aggregate together but also providing a rough surface to contact with the epoxy host, which enhances the compatibility between the Ag@SiO2 fillers and the epoxy matrix. As the Ag@SiO2 packing ratio increases, the permittivity of the composites straightly increases and the loss tangent decreases, reaching the maximum and minimum respectively with the filler loading up to 60%.
This is a preview of subscription content, access via your institution.
We’re sorry, something doesn't seem to be working properly.
Please try refreshing the page. If that doesn't work, please contact support so we can address the problem.
T. Zhou, J.W. Zha, Y. Hou, D.R. Wang, J. Zhao, and Z.M. Dang: Surface-functionalized MWNTs with emeraldine base: Preparation and improving dielectric properties of polymer nanocomposites. ACS Appl. Mater. Interfaces 3, 4557 (2011).
C.P. Bowen, R.E. Newnham, and C.A. Randall: Dielectric properties of dielectrophoretically assembled particulate-polymer composites. J. Mater. Res. 13, 205 (1998).
C. Putson, L. Lebrun, D. Guyomar, N. Muensit, P.J. Cottinet, L. Seveyrat, and B. Guiffard: Effects of copper filler sizes on the dielectric properties and the energy harvesting capability of nonpercolated polyurethane composites. J. Appl. Phys. 109, 024104 (2011).
M.B. Bryning, M.F. Islam, J.M. Kikkawa, and A.G. Yodh: Very low conductivity threshold in bulk isotropic single-walled carbon nanotube-epoxy composites. Adv. Mater. 17, 1186 (2005).
T. Kashiwagi; F.M. Du, J.F. Douglas, K.I. Winey, R.H. Harris, and J.R. Shields: Nanoparticle networks reduce the flammability of polymer nanocomposites. Nat. Mater. 4, 928 (2005).
R.K. Srivastava, T.N. Narayanan, A.P.R. Mary, M.R. Anantharaman, A. Srivastava, R. Vajtai, and P.M. Ajayan: Ni filled flexible multi-walled carbon nanotube-polystyrene composite films as efficient microwave absorbers. Appl. Phys. Lett. 99, 113116 (2011).
A. Dimiev, W. Lu, K. Zeller, B. Crowgey, L.C. Kempel, and J.M. Tour: Low-loss, high-permittivity composites made from graphene nanoribbons. ACS Appl. Mater. Interfaces 3, 4657 (2011).
J.M. Thomassin, I. Huynen, R. Jerome, and C. Detrembleur: Functionalized polypropylenes as efficient dispersing agents for carbon nanotubes in a polypropylene matrix; application to electromagnetic interference (EMI) absorber materials. Polymer 51, 115 (2010).
H.Y. Liu, Y. Shen, Y. Song, C.W. Nan, Y.H. Lin, and X.P. Yang: Carbon nanotube array/polymer core/shell structured composites with high dielectric permittivity, low dielectric loss, and large energy density. Adv. Mater. 23, 5104 (2011).
Z.M. Dang, J.K. Yuan, J.W. Zha, T. Zhou, S.T. Li, and G.H. Hu: Fundamentals, processes and applications of high-permittivity polymer matrix composites. Prog. Mater. Sci. 57, 660 (2012).
C.W. Nan, Y. Shen, and J. Ma: Physical properties of composites near percolation. Annu. Rev. Mater. Res. 40, 131 (2010).
G.S. Wang: Enhanced dielectric properties of three-phase-percolative composites based on thermoplastic-ceramic matrix (BaTiO3 + PVDF) and ZnO radial nanostructures. ACS Appl. Mater. Interfaces 2, 1290 (2010).
L.Y. Xie, X.Y. Huang, C. Wu, and P.K. Jiang: Core-shell structured poly(methyl methacrylate)/BaTiO3 nanocomposites prepared by in situ atom transfer radical polymerization: A route to high dielectric constant materials with the inherent low loss of the base polymer. J. Mater. Chem. 21, 5897 (2011).
Y. Shen, Y.H. Lin, M. Li, and C.W. Nan: High dielectric performance of polymer composite films induced by a percolating interparticle barrier layer. Adv. Mater. 19, 1418 (2007).
L. Qi, B.I. Lee, S.H. Chen, W.D. Samuels, and G.J. Exarhos: High-dielectric-constant silver-epoxy composites as embedded dielectrics. Adv. Mater. 17, 1777 (2005).
J.W. Xu and C.P. Wong: Low-loss percolative dielectric composite. Appl. Phys. Lett. 87, 082907 (2005).
F. He, S. Lau, H.L. Chan, and J.T. Fan: High dielectric permittivity, and low percolation threshold in nanocomposites based on poly(vinylidene fluoride) and exfoliated graphite nanoplates. Adv. Mater. 21, 710 (2009).
T. Wei, C.Q. Jin, W. Zhong, and J.M. Liu: High permittivity polymer embedded with Co/ZnO core/shell nanoparticles modified by organophosphorus acid. Appl. Phys. Lett. 91, 222907 (2007).
Y.C. Zhou, L. Wang, H. Zhang, Y.Y. Bai, Y.J. Niu, and H. Wang: Enhanced high thermal conductivity and low permittivity of polyimide based composites by core-shell Ag@SiO2 nanoparticle fillers. Appl. Phys. Lett. 101, 012903 (2012).
Z.M. Dang, S.S. You, J.W. Zha, H.T. Song, and S.T. Li: Effect of shell-layer thickness on dielectric properties in Ag@TiO2 core@shell nanoparticles filled ferroelectric poly(vinylidene fluoride) composites. Phys. Status Solidi A 207, 739 (2010).
Y. Zhang, Y. Wang, Y.M. Deng, and J.B. Bai: Enhanced dielectric properties of ferroelectric polymer composites induced by metal-semiconductor Zn-ZnO core-shell structure. ACS Appl. Mater. Interfaces 4, 65 (2012).
Y.U. Wang, D.Q. Tan, and J. Krahn: Computational study of dielectric composites with core-shell filler particles. J. Appl. Phys. 110, 044103 (2011).
C. Graf, D.L.J. Vossen, A. Imhof, and A.V. Blaaderen: A general method to coat colloidal particles with silica. Langmuir 19, 6693 (2003).
Y. Shen, Y.H. Lin, and C.W. Nan: Interfacial effect on dielectric properties of polymer nanocomposites filled with core/shell-structured particles. Adv. Funct. Mater. 17, 2405 (2007).
J. Chon, S. Ye, K.J. Cha, S.C. Lee, Y.S. Koo, J.H. Jung, and Y.K. Kwon: High-K dielectric sol-gel hybrid materials containing barium titanate nanoparticles. Chem. Mater. 22, 19 (2010).
Z.M. Dang, T. Zhou, S.H. Yao, J.K. Yuan, J.W. Zha, H.T. Song, J.Y. Li, Q. Chen, W.T. Yang, and J. Bai: Advanced calcium copper titanate/polyimide functional hybrid films with high dielectric permittivity. Adv. Mater. 19, 6 (2007).
G.C. Psarras, E. Manolakaki, and G.M. Tsangaris: Electrical relaxations in polymeric particulate composites of epoxy resin and metal particles. Composites Part A 33, 3 (2002).
P. Lunkenheimer, V. Bobnar, A.V. Pronin, A.I. Ritus, A.A. Volkov, and A. Loidl: Origin of apparent colossal dielectric constants. Phys. Rev. B 66, 5 (2002).
J.J. Li, S.I. Seok, B.J. Chu, F. Dogan, Q.M. Zhang, and Q. Wang: Nanocomposites of ferroelectric polymers with TiO2 nanoparticles exhibiting significantly enhanced electrical energy density. Adv. Mater. 2, 2 (2009).
This work was supported by National Science Foun-dation of China (61025002) and National 973-project of China (2009CB623302).
About this article
Cite this article
Niu, Y., Bai, Y., Yu, K. et al. Fabrication, structure, and property of epoxy-based composites with metal-insulator core-shell structure fillers. Journal of Materials Research 28, 2644–2649 (2013). https://doi.org/10.1557/jmr.2013.248