Evolution of the conducting state of polyaniline from localized to mesoscopic metallic to intrinsic metallic regimes

J. Joo; E. J. Oh; G. Min; A. G. MacDiarmid; A. J. Epstein

doi:10.1016/0379-6779(94)02438-5

Evolution of the conducting state of polyaniline from localized to mesoscopic metallic to intrinsic metallic regimes

J. Joo^*
, E. J. Oh
, G. Min
, A. G. MacDiarmid
, A. J. Epstein

^*Corresponding author for this work

Research output: Contribution to journal › Article › peer-review

75 Citations (Scopus)

Abstract

The results of microwave dielectric constant (ε{lunate}_mw) and dc conductivity (σ_dc) of doped polyaniline (PAN) samples in different charge delocation regimes are reported. With camphor culfonic acid doped PAN prepared in m-cresol solvent (PAN-CSA (m-cresol)) respresenting the most delocalized material, a negative ε{lunate}_mw is measured indicating an intrinsic metallic state. The Drude model at low frequency is used to estimate a relatively small plasma frequency ω_p {reversed tilde equals} 0.015 eV and an anomalously long scattering time τ {reversed tilde equals} 1.2 × 10^-11 s. This τ implies the importance of phonon back scattering for the most delocalized electrons as expected for the open Fermi surface of a highly anisotropic metal. Depending on the crystallinity, there are two different charge localization regimes in PAN samples: uncoupled metallic islands and coupled "mesoscopic" metallic state. The three-dimensional nature of metallic state is demonstrated by the correlation of low temperature dielectric response with the parallel and perpendicular crystalline domain lengths obtained from x-ray data. The charge localization to delocalization transition dependence on the polymer processing will be discussed. We present the temperature dependent nonmetal-metal transition for some preparations of PAN-CSA (m-cresol). The intrinsic conductivity of metallic PAN is estimated to be ∼ 10⁷ S/cm.

Original language	English
Pages (from-to)	251-254
Number of pages	4
Journal	Synthetic Metals
Volume	69
Issue number	1-3
DOIs	https://doi.org/10.1016/0379-6779(94)02438-5
Publication status	Published - 1995 Mar 1
Externally published	Yes

Bibliographical note

Funding Information:
The authors acknowledge discussions with V. N. Prigodin and x-ray scattering experiments and discussions with J. P. Pouget. We thank ONR Grant No. N0001492-J1369 for financial support.

ASJC Scopus subject areas

Electronic, Optical and Magnetic Materials
Condensed Matter Physics
Mechanics of Materials
Mechanical Engineering
Metals and Alloys
Materials Chemistry

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10.1016/0379-6779(94)02438-5

Cite this

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title = "Evolution of the conducting state of polyaniline from localized to mesoscopic metallic to intrinsic metallic regimes",

abstract = "The results of microwave dielectric constant (ε\{lunate\}mw) and dc conductivity (σdc) of doped polyaniline (PAN) samples in different charge delocation regimes are reported. With camphor culfonic acid doped PAN prepared in m-cresol solvent (PAN-CSA (m-cresol)) respresenting the most delocalized material, a negative ε\{lunate\}mw is measured indicating an intrinsic metallic state. The Drude model at low frequency is used to estimate a relatively small plasma frequency ωp \{reversed tilde equals\} 0.015 eV and an anomalously long scattering time τ \{reversed tilde equals\} 1.2 × 10-11 s. This τ implies the importance of phonon back scattering for the most delocalized electrons as expected for the open Fermi surface of a highly anisotropic metal. Depending on the crystallinity, there are two different charge localization regimes in PAN samples: uncoupled metallic islands and coupled {"}mesoscopic{"} metallic state. The three-dimensional nature of metallic state is demonstrated by the correlation of low temperature dielectric response with the parallel and perpendicular crystalline domain lengths obtained from x-ray data. The charge localization to delocalization transition dependence on the polymer processing will be discussed. We present the temperature dependent nonmetal-metal transition for some preparations of PAN-CSA (m-cresol). The intrinsic conductivity of metallic PAN is estimated to be ∼ 107 S/cm.",

author = "J. Joo and Oh, \{E. J.\} and G. Min and MacDiarmid, \{A. G.\} and Epstein, \{A. J.\}",

note = "Funding Information: The authors acknowledge discussions with V. N. Prigodin and x-ray scattering experiments and discussions with J. P. Pouget. We thank ONR Grant No. N0001492-J1369 for financial support.",

year = "1995",

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doi = "10.1016/0379-6779(94)02438-5",

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AU - Joo, J.

AU - Oh, E. J.

AU - Min, G.

AU - MacDiarmid, A. G.

AU - Epstein, A. J.

N1 - Funding Information: The authors acknowledge discussions with V. N. Prigodin and x-ray scattering experiments and discussions with J. P. Pouget. We thank ONR Grant No. N0001492-J1369 for financial support.

PY - 1995/3/1

Y1 - 1995/3/1

N2 - The results of microwave dielectric constant (ε{lunate}mw) and dc conductivity (σdc) of doped polyaniline (PAN) samples in different charge delocation regimes are reported. With camphor culfonic acid doped PAN prepared in m-cresol solvent (PAN-CSA (m-cresol)) respresenting the most delocalized material, a negative ε{lunate}mw is measured indicating an intrinsic metallic state. The Drude model at low frequency is used to estimate a relatively small plasma frequency ωp {reversed tilde equals} 0.015 eV and an anomalously long scattering time τ {reversed tilde equals} 1.2 × 10-11 s. This τ implies the importance of phonon back scattering for the most delocalized electrons as expected for the open Fermi surface of a highly anisotropic metal. Depending on the crystallinity, there are two different charge localization regimes in PAN samples: uncoupled metallic islands and coupled "mesoscopic" metallic state. The three-dimensional nature of metallic state is demonstrated by the correlation of low temperature dielectric response with the parallel and perpendicular crystalline domain lengths obtained from x-ray data. The charge localization to delocalization transition dependence on the polymer processing will be discussed. We present the temperature dependent nonmetal-metal transition for some preparations of PAN-CSA (m-cresol). The intrinsic conductivity of metallic PAN is estimated to be ∼ 107 S/cm.

AB - The results of microwave dielectric constant (ε{lunate}mw) and dc conductivity (σdc) of doped polyaniline (PAN) samples in different charge delocation regimes are reported. With camphor culfonic acid doped PAN prepared in m-cresol solvent (PAN-CSA (m-cresol)) respresenting the most delocalized material, a negative ε{lunate}mw is measured indicating an intrinsic metallic state. The Drude model at low frequency is used to estimate a relatively small plasma frequency ωp {reversed tilde equals} 0.015 eV and an anomalously long scattering time τ {reversed tilde equals} 1.2 × 10-11 s. This τ implies the importance of phonon back scattering for the most delocalized electrons as expected for the open Fermi surface of a highly anisotropic metal. Depending on the crystallinity, there are two different charge localization regimes in PAN samples: uncoupled metallic islands and coupled "mesoscopic" metallic state. The three-dimensional nature of metallic state is demonstrated by the correlation of low temperature dielectric response with the parallel and perpendicular crystalline domain lengths obtained from x-ray data. The charge localization to delocalization transition dependence on the polymer processing will be discussed. We present the temperature dependent nonmetal-metal transition for some preparations of PAN-CSA (m-cresol). The intrinsic conductivity of metallic PAN is estimated to be ∼ 107 S/cm.

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ER -

Evolution of the conducting state of polyaniline from localized to mesoscopic metallic to intrinsic metallic regimes

Abstract

Bibliographical note

ASJC Scopus subject areas

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