Abstract
The conductivity and the dielectric constant of the "emeraldine" form of polyaniline is studied in a wide range of frequency (dc, 101-105 Hz, 6.5×109 Hz), temperature (20K-340K) and protonation level (x ≡[C1]/[N] =0.0-0.5). Two distinct behaviors are observed: Firstly, for low protonation (x ≤ 0.13), hopping of charges between polarons and bipolarons leads to dipolar relaxation (ε{lunate}RF(T)). Oscillation of polarons around pinning centers is suggested to be responsible for the high frequency dielectric constant of low protonated samples. Secondly, for intermediate to highly protonated samples (x > 0.22), the presence of "metallic islands" is apparent. Oscillation of charge carriers within the coherence length contributes to ε{lunate}μω(T=0). The intrinsic conductivity within the islands is estimated to be of the order of 250 S/cm. The T-dependence of the dielectric constant indicates an increase of the coherence length with increasing temperature. The role of localization and the nature of "textured metallic islands" are discussed.
| Original language | English (US) |
|---|---|
| Pages (from-to) | 409-416 |
| Number of pages | 8 |
| Journal | Synthetic Metals |
| Volume | 29 |
| Issue number | 1 |
| DOIs | |
| State | Published - Mar 7 1989 |
| Externally published | Yes |
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ASJC Scopus subject areas
- Electronic, Optical and Magnetic Materials
- Condensed Matter Physics
- Mechanics of Materials
- Mechanical Engineering
- Metals and Alloys
- Materials Chemistry
Cite this
Charge transport in the "emeraldine" form of polyaniline. / Javadi, H. H.S.; Zuo, Fulin; Cromack, K. R.; Angelopoulos, M.; MacDiarmid, A. G.; Epstein, A. J.
In: Synthetic Metals, Vol. 29, No. 1, 07.03.1989, p. 409-416.Research output: Contribution to journal › Article
}
TY - JOUR
T1 - Charge transport in the "emeraldine" form of polyaniline
AU - Javadi, H. H.S.
AU - Zuo, Fulin
AU - Cromack, K. R.
AU - Angelopoulos, M.
AU - MacDiarmid, A. G.
AU - Epstein, A. J.
PY - 1989/3/7
Y1 - 1989/3/7
N2 - The conductivity and the dielectric constant of the "emeraldine" form of polyaniline is studied in a wide range of frequency (dc, 101-105 Hz, 6.5×109 Hz), temperature (20K-340K) and protonation level (x ≡[C1]/[N] =0.0-0.5). Two distinct behaviors are observed: Firstly, for low protonation (x ≤ 0.13), hopping of charges between polarons and bipolarons leads to dipolar relaxation (ε{lunate}RF(T)). Oscillation of polarons around pinning centers is suggested to be responsible for the high frequency dielectric constant of low protonated samples. Secondly, for intermediate to highly protonated samples (x > 0.22), the presence of "metallic islands" is apparent. Oscillation of charge carriers within the coherence length contributes to ε{lunate}μω(T=0). The intrinsic conductivity within the islands is estimated to be of the order of 250 S/cm. The T-dependence of the dielectric constant indicates an increase of the coherence length with increasing temperature. The role of localization and the nature of "textured metallic islands" are discussed.
AB - The conductivity and the dielectric constant of the "emeraldine" form of polyaniline is studied in a wide range of frequency (dc, 101-105 Hz, 6.5×109 Hz), temperature (20K-340K) and protonation level (x ≡[C1]/[N] =0.0-0.5). Two distinct behaviors are observed: Firstly, for low protonation (x ≤ 0.13), hopping of charges between polarons and bipolarons leads to dipolar relaxation (ε{lunate}RF(T)). Oscillation of polarons around pinning centers is suggested to be responsible for the high frequency dielectric constant of low protonated samples. Secondly, for intermediate to highly protonated samples (x > 0.22), the presence of "metallic islands" is apparent. Oscillation of charge carriers within the coherence length contributes to ε{lunate}μω(T=0). The intrinsic conductivity within the islands is estimated to be of the order of 250 S/cm. The T-dependence of the dielectric constant indicates an increase of the coherence length with increasing temperature. The role of localization and the nature of "textured metallic islands" are discussed.
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UR - http://www.scopus.com/inward/citedby.url?scp=0024963594&partnerID=8YFLogxK
U2 - 10.1016/0379-6779(89)90326-3
DO - 10.1016/0379-6779(89)90326-3
M3 - Article
VL - 29
SP - 409
EP - 416
JO - Synthetic Metals
JF - Synthetic Metals
SN - 0379-6779
IS - 1
ER -