Electrical, magnetic, and structural properties of chemically and electrochemically synthesized polypyrroles

J. Joo; J. K. Lee; J. S. Baeck; K. H. Kim; E. J. Oh; J. Epstein

doi:10.1016/S0379-6779(00)00537-3

Electrical, magnetic, and structural properties of chemically and electrochemically synthesized polypyrroles

J. Joo, J. K. Lee, J. S. Baeck, K. H. Kim, E. J. Oh, J. Epstein

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

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Abstract

We report the results of temperature-dependent dc conductivity (σ_dc(T)), EPR (electron paramagnetic resonance) magnetic susceptibility, and XPS (X-ray photoelectron spectroscopy) experiments for chemically and electrochemically synthesized polypyrrole (PPy) samples. For chemically synthesized dodecylbenzenesulfonic acid (DBSA) or naphthalenesulfonic acid (NSA) doped PPy samples (PPy-DBSA or PPy-NSA, respectively) soluble in m-cresol solvent, dc conductivity and its temperature dependence show the strong localization behavior, while those of electrochemically synthesized PPy doped with hexafluorophosphate (PPy-PF₆) are in the critical regime. Pauli susceptibility (χ^p) and the density of states are obtained from the temperature dependence of EPR magnetic susceptibility. The density of states of chemically synthesized PPy is one-third of that of electrochemically synthesized PPy. From the analysis of the area ratio of carbon 1 s XPS peak, the disorder effect due to interchain links or side chains of PPy-DBSA (m-cresol) samples is approximately 22%, while that of PPy-PF₆ samples is approximately 33%. This result indicates that the percent of interchain links or side chains of chemically synthesized PPy-DBSA (m-cresol) samples is reduced by approximately 10% compared to that of electrochemically synthesized PPy-PF₆ samples. We analyze that the side chains or interchain links of chemically synthesized PPy samples are relatively reduced due to the synthesis method using large size dopants, and subsequently the interchain interaction weakens. The results of EPR experiments of PPy-DBSA (m-cresol) samples with different doping levels are discussed.

Original language	English
Pages (from-to)	45-51
Number of pages	7
Journal	Synthetic Metals
Volume	117
Issue number	1-3
DOIs	https://doi.org/10.1016/S0379-6779(00)00537-3
Publication status	Published - 2001 Feb 15

Bibliographical note

Funding Information:
This work was supported in part by the CRM-KOSEF (1998).

Copyright:
Copyright 2017 Elsevier B.V., All rights reserved.

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/S0379-6779(00)00537-3

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title = "Electrical, magnetic, and structural properties of chemically and electrochemically synthesized polypyrroles",

abstract = "We report the results of temperature-dependent dc conductivity (σdc(T)), EPR (electron paramagnetic resonance) magnetic susceptibility, and XPS (X-ray photoelectron spectroscopy) experiments for chemically and electrochemically synthesized polypyrrole (PPy) samples. For chemically synthesized dodecylbenzenesulfonic acid (DBSA) or naphthalenesulfonic acid (NSA) doped PPy samples (PPy-DBSA or PPy-NSA, respectively) soluble in m-cresol solvent, dc conductivity and its temperature dependence show the strong localization behavior, while those of electrochemically synthesized PPy doped with hexafluorophosphate (PPy-PF6) are in the critical regime. Pauli susceptibility (χp) and the density of states are obtained from the temperature dependence of EPR magnetic susceptibility. The density of states of chemically synthesized PPy is one-third of that of electrochemically synthesized PPy. From the analysis of the area ratio of carbon 1 s XPS peak, the disorder effect due to interchain links or side chains of PPy-DBSA (m-cresol) samples is approximately 22%, while that of PPy-PF6 samples is approximately 33%. This result indicates that the percent of interchain links or side chains of chemically synthesized PPy-DBSA (m-cresol) samples is reduced by approximately 10% compared to that of electrochemically synthesized PPy-PF6 samples. We analyze that the side chains or interchain links of chemically synthesized PPy samples are relatively reduced due to the synthesis method using large size dopants, and subsequently the interchain interaction weakens. The results of EPR experiments of PPy-DBSA (m-cresol) samples with different doping levels are discussed.",

author = "J. Joo and Lee, {J. K.} and Baeck, {J. S.} and Kim, {K. H.} and Oh, {E. J.} and J. Epstein",

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AU - Joo, J.

AU - Lee, J. K.

AU - Baeck, J. S.

AU - Kim, K. H.

AU - Oh, E. J.

AU - Epstein, J.

PY - 2001/2/15

Y1 - 2001/2/15

N2 - We report the results of temperature-dependent dc conductivity (σdc(T)), EPR (electron paramagnetic resonance) magnetic susceptibility, and XPS (X-ray photoelectron spectroscopy) experiments for chemically and electrochemically synthesized polypyrrole (PPy) samples. For chemically synthesized dodecylbenzenesulfonic acid (DBSA) or naphthalenesulfonic acid (NSA) doped PPy samples (PPy-DBSA or PPy-NSA, respectively) soluble in m-cresol solvent, dc conductivity and its temperature dependence show the strong localization behavior, while those of electrochemically synthesized PPy doped with hexafluorophosphate (PPy-PF6) are in the critical regime. Pauli susceptibility (χp) and the density of states are obtained from the temperature dependence of EPR magnetic susceptibility. The density of states of chemically synthesized PPy is one-third of that of electrochemically synthesized PPy. From the analysis of the area ratio of carbon 1 s XPS peak, the disorder effect due to interchain links or side chains of PPy-DBSA (m-cresol) samples is approximately 22%, while that of PPy-PF6 samples is approximately 33%. This result indicates that the percent of interchain links or side chains of chemically synthesized PPy-DBSA (m-cresol) samples is reduced by approximately 10% compared to that of electrochemically synthesized PPy-PF6 samples. We analyze that the side chains or interchain links of chemically synthesized PPy samples are relatively reduced due to the synthesis method using large size dopants, and subsequently the interchain interaction weakens. The results of EPR experiments of PPy-DBSA (m-cresol) samples with different doping levels are discussed.

AB - We report the results of temperature-dependent dc conductivity (σdc(T)), EPR (electron paramagnetic resonance) magnetic susceptibility, and XPS (X-ray photoelectron spectroscopy) experiments for chemically and electrochemically synthesized polypyrrole (PPy) samples. For chemically synthesized dodecylbenzenesulfonic acid (DBSA) or naphthalenesulfonic acid (NSA) doped PPy samples (PPy-DBSA or PPy-NSA, respectively) soluble in m-cresol solvent, dc conductivity and its temperature dependence show the strong localization behavior, while those of electrochemically synthesized PPy doped with hexafluorophosphate (PPy-PF6) are in the critical regime. Pauli susceptibility (χp) and the density of states are obtained from the temperature dependence of EPR magnetic susceptibility. The density of states of chemically synthesized PPy is one-third of that of electrochemically synthesized PPy. From the analysis of the area ratio of carbon 1 s XPS peak, the disorder effect due to interchain links or side chains of PPy-DBSA (m-cresol) samples is approximately 22%, while that of PPy-PF6 samples is approximately 33%. This result indicates that the percent of interchain links or side chains of chemically synthesized PPy-DBSA (m-cresol) samples is reduced by approximately 10% compared to that of electrochemically synthesized PPy-PF6 samples. We analyze that the side chains or interchain links of chemically synthesized PPy samples are relatively reduced due to the synthesis method using large size dopants, and subsequently the interchain interaction weakens. The results of EPR experiments of PPy-DBSA (m-cresol) samples with different doping levels are discussed.

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JO - Synthetic Metals

JF - Synthetic Metals

IS - 1-3

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Electrical, magnetic, and structural properties of chemically and electrochemically synthesized polypyrroles

Abstract

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