Solvent polarity effect on chain conformation, film morphology, and optical properties of a water-soluble conjugated polymer

Zhihua Xu, Hsinhan Tsai, Hsing Lin Wang, Mircea Cotlet

Research output: Contribution to journalArticle

28 Citations (Scopus)

Abstract

The solvent polarity effect on chain conformation, film morphology, and photophysical properties of a nonionic water-soluble conjugated polymer (WSCP), poly[2,5-bis(diethylaminetetraethylene glycol)phenylene vinylene] (DEATG-PPV) is investigated in detail. The combination of stationary absorption and photoluminescence (PL) spectroscopy, time-resolved PL spectroscopy, and fluorescence correlation spectroscopy methods enables us to probe the chain conformation of DEATG-PPV, down to the level of a single chain when working with extremely diluted solutions. The use of correlated atomic force microscopy and confocal fluorescence lifetime imaging microscopy measurements of drop-casted DEATG-PPV films reveals the intrinsic relationship between chain conformation, film morphology, and optical properties. Depending on solvent polarity, DEATG-PPV presents extended, coiled, and collapsed chain conformations in solutions, which lead to distinct morphology and optical properties in solid films. Our work presents a pathway to control and characterize the film morphologies of WSCPs toward the optimal performance of various optoelectronic devices.

Original languageEnglish (US)
Pages (from-to)11746-11752
Number of pages7
JournalJournal of Physical Chemistry B
Volume114
Issue number36
DOIs
StatePublished - Sep 16 2010

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Conjugated polymers
Conformations
polarity
Optical properties
optical properties
Water
polymers
Photoluminescence spectroscopy
water
Fluorescence
spectroscopy
photoluminescence
fluorescence
Glycols
optoelectronic devices
Absorption spectroscopy
Optoelectronic devices
glycols
Atomic force microscopy
Microscopic examination

Cite this

Solvent polarity effect on chain conformation, film morphology, and optical properties of a water-soluble conjugated polymer. / Xu, Zhihua; Tsai, Hsinhan; Wang, Hsing Lin; Cotlet, Mircea.

In: Journal of Physical Chemistry B, Vol. 114, No. 36, 16.09.2010, p. 11746-11752.

Research output: Contribution to journalArticle

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