Encapsulation of poly(3-hexylthiophene) J-aggregate nanofibers with an amphiphilic block copolymer

Jian Gao, Amanda Kamps, So Jung Park, John K. Grey

Research output: Contribution to journalArticlepeer-review

18 Scopus citations

Abstract

Poly(3-hexylthiophene) (P3HT) nanofibers (NF) displaying J-aggregate exciton coupling behavior are encapsulated with the amphiphilic block copolymer (BCP), poly(3-hexyl-thiophene)-block-poly(ethylene-glycol), (PHT 20-b-PEG108). Encapsulation results in the formation of hierarchical superstructures, and the BCP coating is expected to exert a mild chemical pressure on the periphery of the NFs. Photoluminescence from encapsulated NF superstructures show line shape distortions due to self-absorption of the 0-0 transition which is consistent with preservation of J-aggregate character (intrachain order). Detailed resonance Raman spectra of encapsulated BCP-NF structures show no discernible changes in the P3HT aggregation state, and overtone and combination bands involving the symmetric stretching C=C (∼1450 cm-1) and C-C (∼1380 cm-1) backbone modes are observed. These features permit quantitative estimates of vibrational mode-specific excited state structural displacements using a time-dependent Raman intensity analysis which is not possible from conventional vibronic analysis of optical lineshapes.

Original languageEnglish
Pages (from-to)16401-16407
Number of pages7
JournalLangmuir
Volume28
Issue number47
DOIs
StatePublished - 27 Nov 2012

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