Infrared spectroscopic signatures of phase segregation in P3HT-porphyrin blends

Audrey A. Eigner, Patrick E. Konold, Aaron Massari

Research output: Contribution to journalArticlepeer-review

8 Scopus citations

Abstract

Phase segregation of 2,3,7,8,12,13,17,18-octaethyl-21H,23H-porphine ruthenium(II)carbonyl (RuOEP) and regioregular poly(3-hexylthiophene-2,5-diyl) (P3HT) in thin films is investigated with infrared and UV-visible spectroscopies as well as transmission electron microscopy (TEM). The Fourier transform infrared (FTIR) spectrum of the ruthenium-bound CO symmetric stretching mode exhibits significant changes as these films are annealed in solvent vapors. The development of multiple inhomogeneously broadened microenvironments is observed, and UV-visible spectra and TEM support a model of homogeneous porphyrin distribution throughout the P3HT films that gradually becomes more heterogeneous as the P3HT and RuOEP molecules phase segregate. A complete model for the phase segregation process experienced by the embedded RuOEP is proposed to explain the collective experimental observations.

Original languageEnglish (US)
Pages (from-to)14549-14554
Number of pages6
JournalJournal of Physical Chemistry B
Volume113
Issue number44
DOIs
StatePublished - May 11 2009

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