このエントリーをはてなブックマークに追加
ID 17063
file
creator
Parkhutik, Vitali
Patil, Rahul
subject
Conjugated polymers
power spectra of autocorrelation function
structural function of second order
percolation threshold
NDC
Chemical technology
abstract
We have performed detailed analysis of the fluctuations of the electrical current in electrochemically deposited conductive polymers (CP) using as example polyaniline and poly(3- methylthiophene). These heterogeneous and disordered materials cannot be analyzed in terms of classical conduction mechanisms (like Schottky or Poole-Frenkel emission). Instead, the electrical transport in CPs is to be considered as a stochastic process with large component of noise. We have been able to distinguish several modes of the conduction process in CPs by applying Flicker Noise Spectroscopy. Thus, we have established that the transport of charge carriers in highly doped CPs is much less correlated than in non-doped ones at the same electric field strength. While applied electric field increases, correlations become lower in a sequence of elementary events contributing to the conductivity of CP. Apparently, the change in the correlation length corresponds to changing mechanism of the electrical conduction. The lower correlation in highly doped sample can be attributed to various factors including change in CP conformation, enhancement in interchain charge transfer and generation of polaron lattice.
journal title
Electrochimica Acta
volume
Volume 51
issue
Issue 13
start page
2656
end page
2661
date of issued
2006-05-05
publisher
Elsevier
issn
0013-4686
ncid
publisher doi
language
eng
nii type
Journal Article
HU type
Journal Articles
DCMI type
text
format
application/pdf
text version
author
rights
Copyright (c) 2006 Elsevier Ltd.
relation is version of URL
http://dx.doi.org/10.1016/j.electacta.2005.08.005
department
Graduate School of Engineering