Cationic polythiophene-surfactant self-assembly complexes: Phase transitions, optical response, and sensing

Rachel C. Evans; M. Knaapila; N. Willis-Fox; M. Kraft; Anne Terry; Hugh D. Burrows; Ullrich Scherf

doi:10.1021/la302166a

Cationic polythiophene-surfactant self-assembly complexes: Phase transitions, optical response, and sensing

Rachel C. Evans, M. Knaapila, N. Willis-Fox, M. Kraft, Anne Terry, Hugh D. Burrows, Ullrich Scherf

Materials Engineering

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

Abstract

The absorption and photoluminescence spectra of the cationic conjugated polyelectrolyte poly[3-(6-trimethylammoniumhexyl)thiophene] (P3TMAHT) were observed to be dramatically altered in the presence of anionic surfactants due to self-assembly through ionic complex formation. Small-angle neutron scattering (SANS), UV/vis, and photoluminescence spectroscopy were used to probe the relationship between the supramolecular complex organization and the photophysical response of P3TMAHT in the presence of industrially important anionic surfactants. Subtle differences in the surfactant mole fraction and chemical structure (e.g., chain length, headgroup charge density, perfluorination) result in marked variations in the range and type of complexes formed, which can be directly correlated to a unique colorimetric and fluorimetric fingerprint. Our results show that P3TMAHT has potential as an optical sensor for anionic surfactants capable of selectively identifying distinct structural subgroups through dual mode detection.

Original language	English
Pages (from-to)	12348-12356
Number of pages	9
Journal	Langmuir
Volume	28
Issue number	33
Early online date	10 Aug 2012
DOIs	https://doi.org/10.1021/la302166a
Publication status	Published - 21 Aug 2012

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abstract = "The absorption and photoluminescence spectra of the cationic conjugated polyelectrolyte poly[3-(6-trimethylammoniumhexyl)thiophene] (P3TMAHT) were observed to be dramatically altered in the presence of anionic surfactants due to self-assembly through ionic complex formation. Small-angle neutron scattering (SANS), UV/vis, and photoluminescence spectroscopy were used to probe the relationship between the supramolecular complex organization and the photophysical response of P3TMAHT in the presence of industrially important anionic surfactants. Subtle differences in the surfactant mole fraction and chemical structure (e.g., chain length, headgroup charge density, perfluorination) result in marked variations in the range and type of complexes formed, which can be directly correlated to a unique colorimetric and fluorimetric fingerprint. Our results show that P3TMAHT has potential as an optical sensor for anionic surfactants capable of selectively identifying distinct structural subgroups through dual mode detection.",

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AU - Evans, Rachel C.

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AU - Willis-Fox, N.

AU - Kraft, M.

AU - Terry, Anne

AU - Burrows, Hugh D.

AU - Scherf, Ullrich

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N2 - The absorption and photoluminescence spectra of the cationic conjugated polyelectrolyte poly[3-(6-trimethylammoniumhexyl)thiophene] (P3TMAHT) were observed to be dramatically altered in the presence of anionic surfactants due to self-assembly through ionic complex formation. Small-angle neutron scattering (SANS), UV/vis, and photoluminescence spectroscopy were used to probe the relationship between the supramolecular complex organization and the photophysical response of P3TMAHT in the presence of industrially important anionic surfactants. Subtle differences in the surfactant mole fraction and chemical structure (e.g., chain length, headgroup charge density, perfluorination) result in marked variations in the range and type of complexes formed, which can be directly correlated to a unique colorimetric and fluorimetric fingerprint. Our results show that P3TMAHT has potential as an optical sensor for anionic surfactants capable of selectively identifying distinct structural subgroups through dual mode detection.

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Cationic polythiophene-surfactant self-assembly complexes: Phase transitions, optical response, and sensing

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