Electrical conductivity and dielectric properties of SiO2 nanoparticles dispersed in conducting polymer matrix

被引：40

作者：

Dutta, Kousik ^{[1
]}

De, S. K. ^{[1
]}

机构：

[1] Indian Assoc Cultivat Sci, Dept Mat Sci, Jadavpur 700032, Kolkata, India

来源：

JOURNAL OF NANOPARTICLE RESEARCH | 2007年 / 9卷 / 04期

关键词：

conducting polymer; silica nanoparticles; nanocomposites; electrical conductivity; dielectric; mixing; dispersion;

D O I：

10.1007/s11051-006-9184-4

中图分类号：

O6 [化学];

学科分类号：

0703 ;

摘要：

Electrical and dielectric properties of conducting polypyrrole-wide band gap silica (PPY-SiO2) nanocomposites have been investigated as a function of temperature and frequency for different concentrations of polypyrrole. The average grain size of the nanocomposites is in the range of 40-80 nm. Impedance spectra reveal two distorted semicircles corresponding to grain and grain boundary effects. The magnitude of conductivity and its temperature variation are significantly different from polypyrrole and silica. A very large dielectric constant of about 4800 at 30 kHz and at room temperature has been observed for the highest concentration of silica. Inhomogeneous behavior of nanocomposites gives rise to high dielectric constant.

引用

页码：631 / 638

页数：8

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