Chemistry and Physics Faculty Articles
Title
Exciton Peak Redshifting and Broadening in Polyaniline Chains During Ion-Induced Hydrophobic Collapse and Aggregation
Document Type
Article
Publication Date
11-2011
Publication Title
Synthetic Metals
Keywords
Polyaniline, Exciton, Spectroscopy, Polymer aggregation, Hydrophobic collapse
ISSN
0379-6779
Volume
161
Issue/No.
21-22
First Page
2284
Last Page
2288
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.
Additional Comments
IGERT grant #: 0221678; NS EC grant #: EEC-0425626
NSUWorks Citation
Nemzer, L. R., & Epstein, A. J. (2011). Exciton Peak Redshifting and Broadening in Polyaniline Chains During Ion-Induced Hydrophobic Collapse and Aggregation. Synthetic Metals, 161, (21-22), 2284 - 2288. https://doi.org/10.1016/j.synthmet.2011.08.034. Retrieved from https://nsuworks.nova.edu/cnso_chemphys_facarticles/88
DOI
10.1016/j.synthmet.2011.08.034
Comments
©2011 Elsevier B.V. All rights reserved.