Exciton Peak Redshifting and Broadening in Polyaniline Chains During Ion-Induced Hydrophobic Collapse and Aggregation

Louis R. Nemzer; Arthur J. Epstein

doi:10.1016/j.synthmet.2011.08.034

Exciton Peak Redshifting and Broadening in Polyaniline Chains During Ion-Induced Hydrophobic Collapse and Aggregation

Louis R. Nemzer
, Arthur J. Epstein

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

Abstract

The ion-induced reprecipitation of the emeraldine base form of polyaniline from an aqueous-organic binary solution is a facile method for obtaining polymer nanoparticles and microscale clusters. The hydrophobic collapse and aggregation that accompanies the addition of various cosolutes induces changes in the peak wavelength and linewidth of the main exciton absorption. In particular, we find that the addition of ionic cosoutes leads to a redshifting and broadening of this spectroscopic feature, with divalent coions exhibiting an additional hypsochromic reversal at high concentrations. The denaturant urea, in contrast, causes a blueshift and line-narrowing at all concentrations. Using a quantitative Lorentz fit, we show how the redshifting and broadening of this spectral feature can be attributed, at least in part, to the forced planarization of the polymer chains in the collapsed state. © 2011 Elsevier B.V. All rights reserved.

Original language	American English
Pages (from-to)	2284-2288
Number of pages	5
Journal	Synthetic Metals
Volume	161
Issue number	21-22
DOIs	https://doi.org/10.1016/j.synthmet.2011.08.034
State	Published - Nov 1 2011
Externally published	Yes

Funding

The authors would like to express their appreciation to Dr. Nan-Rong Chiou and Dr. Yong Min for their insights and invaluable suggestions. This material is based upon work supported by the National Science Foundation under IGERT Grant No. 0221678 and NSEC Grant No. EEC-0425626 as well as an Ohio State University Institute for Materials Research facilities grant.

Funders	Funder number
NSEC	EEC-0425626
National Science Foundation	0221678

ASJC Scopus Subject Areas

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

Keywords

Exciton
Hydrophobic collapse
Polyaniline
Polymer aggregation
Spectroscopy

Disciplines

Physical Sciences and Mathematics
Materials Science and Engineering
Condensed Matter Physics
Mechanics of Materials
Mechanical Engineering
Materials Chemistry

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10.1016/j.synthmet.2011.08.034

Cite this

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title = "Exciton Peak Redshifting and Broadening in Polyaniline Chains During Ion-Induced Hydrophobic Collapse and Aggregation",

abstract = "The ion-induced reprecipitation of the emeraldine base form of polyaniline from an aqueous-organic binary solution is a facile method for obtaining polymer nanoparticles and microscale clusters. The hydrophobic collapse and aggregation that accompanies the addition of various cosolutes induces changes in the peak wavelength and linewidth of the main exciton absorption. In particular, we find that the addition of ionic cosoutes leads to a redshifting and broadening of this spectroscopic feature, with divalent coions exhibiting an additional hypsochromic reversal at high concentrations. The denaturant urea, in contrast, causes a blueshift and line-narrowing at all concentrations. Using a quantitative Lorentz fit, we show how the redshifting and broadening of this spectral feature can be attributed, at least in part, to the forced planarization of the polymer chains in the collapsed state. {\textcopyright} 2011 Elsevier B.V. All rights reserved.",

keywords = "Exciton, Hydrophobic collapse, Polyaniline, Polymer aggregation, Spectroscopy",

author = "Nemzer, \{Louis R.\} and Epstein, \{Arthur J.\}",

year = "2011",

month = nov,

day = "1",

doi = "10.1016/j.synthmet.2011.08.034",

language = "American English",

volume = "161",

pages = "2284--2288",

journal = "Synthetic Metals",

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TY - JOUR

T1 - Exciton Peak Redshifting and Broadening in Polyaniline Chains During Ion-Induced Hydrophobic Collapse and Aggregation

AU - Nemzer, Louis R.

AU - Epstein, Arthur J.

PY - 2011/11/1

Y1 - 2011/11/1

N2 - The ion-induced reprecipitation of the emeraldine base form of polyaniline from an aqueous-organic binary solution is a facile method for obtaining polymer nanoparticles and microscale clusters. The hydrophobic collapse and aggregation that accompanies the addition of various cosolutes induces changes in the peak wavelength and linewidth of the main exciton absorption. In particular, we find that the addition of ionic cosoutes leads to a redshifting and broadening of this spectroscopic feature, with divalent coions exhibiting an additional hypsochromic reversal at high concentrations. The denaturant urea, in contrast, causes a blueshift and line-narrowing at all concentrations. Using a quantitative Lorentz fit, we show how the redshifting and broadening of this spectral feature can be attributed, at least in part, to the forced planarization of the polymer chains in the collapsed state. © 2011 Elsevier B.V. All rights reserved.

AB - The ion-induced reprecipitation of the emeraldine base form of polyaniline from an aqueous-organic binary solution is a facile method for obtaining polymer nanoparticles and microscale clusters. The hydrophobic collapse and aggregation that accompanies the addition of various cosolutes induces changes in the peak wavelength and linewidth of the main exciton absorption. In particular, we find that the addition of ionic cosoutes leads to a redshifting and broadening of this spectroscopic feature, with divalent coions exhibiting an additional hypsochromic reversal at high concentrations. The denaturant urea, in contrast, causes a blueshift and line-narrowing at all concentrations. Using a quantitative Lorentz fit, we show how the redshifting and broadening of this spectral feature can be attributed, at least in part, to the forced planarization of the polymer chains in the collapsed state. © 2011 Elsevier B.V. All rights reserved.

KW - Exciton

KW - Hydrophobic collapse

KW - Polyaniline

KW - Polymer aggregation

KW - Spectroscopy

UR - https://nsuworks.nova.edu/cnso_chemphys_facarticles/88

UR - https://www.scopus.com/pages/publications/80055083807

UR - https://www.scopus.com/pages/publications/80055083807#tab=citedBy

U2 - 10.1016/j.synthmet.2011.08.034

DO - 10.1016/j.synthmet.2011.08.034

M3 - Article

SN - 0379-6779

VL - 161

SP - 2284

EP - 2288

JO - Synthetic Metals

JF - Synthetic Metals

IS - 21-22

ER -

Exciton Peak Redshifting and Broadening in Polyaniline Chains During Ion-Induced Hydrophobic Collapse and Aggregation

Abstract

Funding

ASJC Scopus Subject Areas

Keywords

Disciplines

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