Studies on conductivity and dielectric properties of polyaniline-zinc sulphide composites

被引:113
作者
Pant, H. C. [1 ]
Patra, M. K. [1 ]
Negi, S. C. [1 ]
Bhatia, A. [1 ]
Vadera, S. R. [1 ]
Kumar, N. [1 ]
机构
[1] Def Lab, Jodhpur 342011, Rajasthan, India
关键词
complex dielectric constant; percolation threshold; interfacial interaction; degree of crystallinity; characteristic temperature;
D O I
10.1007/BF02704139
中图分类号
T [工业技术];
学科分类号
08 ;
摘要
In the present paper, we report electrical conductivity and dielectric studies on the composites of conducting polyanifne (PANI) with crystalline semiconducting ZnS powder, wherein PANI has been taken as inclusion and ZnS crystallites as the host matrix. From the studies, it has been observed that the value of room temperature d.c. conductivity of the composites with volume fraction of PANI > 0.65 shows an unusual behaviour wherein, conductivity values of the composites exceed that of PANI itself with maximum value as high as 6 times that of PANI at the volume fraction of 0.85. A similar trend has also been observed for the real and imaginary parts of complex dielectric constant values of the composites. This unusual behaviour in the d.c. conductivity and dielectric properties has been attributed to the enhancement in the degree of crystallinity of PANI as a consequence of its interfacial interaction with ZnS matrix. The results of optical microscopy show coating of PANI all around the ZnS particles. The temperature dependent conductivity studies suggest the quasi one-dimensional VRH conduction in PANI as well as its composites with ZnS. FTIR and XRD studies have also been reported.
引用
收藏
页码:379 / 384
页数:6
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