Thermoelectric power and AC electrical properties of PAN-based carbon fiber composites

The thermoelectric power and AC electrical properties of conductive polymer composites made of polycarbonate filled with randomly distributed PAN-based carbon fibers of different concentration: 0, 5, 10, 18, and 30 wt% were studied. The thermoelectric power was measured as a function of temperature...

Full description

Saved in:
Bibliographic Details
Published in:Journal of materials science. Materials in electronics 2008-11, Vol.19 (11), p.1079-1085
Main Authors: Saq’an, S., Zihlif, A. M., Al-Ani, S. R., Ragosta, G.
Format: Article
Language:English
Subjects:
Activation energy
Alternating current
Applied sciences
Carbon fibers
Characterization and Evaluation of Materials
Chemistry and Materials Science
Coefficients
Electric power generation
Electronics
Exact sciences and technology
Materials
Materials Science
Mathematical analysis
Optical and Electronic Materials
Semiconductors
Thermoelectricity
Citations: Items that this one cites
Items that cite this one
Online Access:Get full text
Tags: Add Tag
No Tags, Be the first to tag this record!
Description
Summary:The thermoelectric power and AC electrical properties of conductive polymer composites made of polycarbonate filled with randomly distributed PAN-based carbon fibers of different concentration: 0, 5, 10, 18, and 30 wt% were studied. The thermoelectric power was measured as a function of temperature in the frequency range from 200 kHz to 12 MHz. It was found that the observed Seebeck coefficient and thermoelectric activation energy depend on temperature, frequency and fiber concentration. The Seebeck coefficient calculated using the electrical transport theory of semiconductors decreases with both increasing temperature and carbon fiber content. The thermoelectric power results revealed that the composites function electrically as semiconductors. Dielectric constants and AC conductivity were calculated from impedance and phase angle measurements. It was found that both increase with increasing temperature. The activation energy and relaxation time decrease with increasing temperature measured and applied frequency. The thermoelectric power results indicated that electrical conduction in bulk composites is produced from a combination of transport processes involving: electrons, holes, ions and charged impurity motion in addition to protonic migration.
ISSN:0957-4522
1573-482X
DOI:10.1007/s10854-007-9470-7