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Microstructure and dielectric behavior of the three-phase Ag@SiO2/BaTiO3/PVDF composites with high permittivity

Published online by Cambridge University Press:  29 February 2012

Xianwen Liang ,
Shuhui Yu ,
Rong Sun ,
Suibin Luo ,
Jie Wan ,
Shuhui Yu ,
Rong Sun ,
Suibin Luo ,
Xianwen Liang  and
Jie Wan
...Show all authors
Xianwen Liang
Affiliation:
Center for Precision Engineering, Shenzhen Institutes of Advanced Technology, Chinese Academy of Sciences, Shenzhen University Town, Shenzhen 518055, China
Shuhui Yu*
Affiliation:
Center for Precision Engineering, Shenzhen Institutes of Advanced Technology, Chinese Academy of Sciences, Shenzhen University Town, Shenzhen 518055, China
Rong Sun*
Affiliation:
Center for Precision Engineering, Shenzhen Institutes of Advanced Technology, Chinese Academy of Sciences, Shenzhen University Town, Shenzhen 518055, China
Suibin Luo
Affiliation:
Center for Precision Engineering, Shenzhen Institutes of Advanced Technology, Chinese Academy of Sciences, Shenzhen University Town, Shenzhen 518055, China
Jie Wan
Affiliation:
Center for Precision Engineering, Shenzhen Institutes of Advanced Technology, Chinese Academy of Sciences, Shenzhen University Town, Shenzhen 518055, China
Shuhui Yu*
Affiliation:
The Chinese University of Hong Kong, Shatin, N.T. Hong Kong 999077, China
Rong Sun*
Affiliation:
The Chinese University of Hong Kong, Shatin, N.T. Hong Kong 999077, China
Suibin Luo
Affiliation:
The Chinese University of Hong Kong, Shatin, N.T. Hong Kong 999077, China
Xianwen Liang
Affiliation:
Department of Materials Science and Engineering, South China University of Technology, Tianhe District, Guangzhou 510641, China
Jie Wan
Affiliation:
Department of Materials Science and Engineering, South China University of Technology, Tianhe District, Guangzhou 510641, China
Zhiqiang Zhuang
Affiliation:
Department of Materials Science and Engineering, South China University of Technology, Tianhe District, Guangzhou 510641, China
*
a)Address all correspondence to thses authors. e-mail: yuushu@gmail.com
b)e-mail: rong.sun@siat.ac.cn
a)Address all correspondence to thses authors. e-mail: yuushu@gmail.com
b)e-mail: rong.sun@siat.ac.cn
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Abstract

Ag nanoparticles were prepared via a wet chemical reduction method and treated with tetraethoxysilane (TEOS) to form an insulating SiO2 layer on the surface (Ag@SiO2). The Ag@SiO2 nanoparticles were introduced in to the BaTiO3/poly (vinylidene fluoride) matrix to prepare the three-phase Ag@SiO2/BaTiO3/poly (vinylidene fluoride) composite, and the dielectric behavior of the composite was investigated. The results showed that the typical “conductor/polymer” percolation effect was not observed in the composite as a result of the SiO2 layer, which prevented Ag particles from contacting with each other directly and restricted the movement of electrons under external field. The high dielectric constant of 723 and a relatively low loss of 0.82 were achieved at 100 Hz with 40 vol% Ag@SiO2 and 20 vol% BaTiO3, respectively. The microcapacitor network model and “Maxwell-Wagner-Sillars” (MWS) effect were used to investigate dielectric properties of the three-phase composite.

Keywords

Core/shellDielectric propertiesComposite
Type
Articles
Information
Journal of Materials Research , Volume 27 , Issue 7 , 14 April 2012 , pp. 991 - 998
Copyright
Copyright © Materials Research Society 2012

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