Relaxation in Thin Polymer Films Mapped across the Film Thickness by Astigmatic Single-Molecule Imaging

Tatsuya Oba, Martin Vacha

Research output: Contribution to journalArticlepeer-review

13 Scopus citations

Abstract

We have studied relaxation processes in thin supported films of poly(methyl acrylate) at the temperature corresponding to 13 K above the glass transition by monitoring the reorientation of single perylenediimide molecules doped into the films. The axial position of the dye molecules across the thickness of the film was determined with a resolution of 12 nm by analyzing astigmatic fluorescence images. The average relaxation times of the rotating molecules do not depend on the overall thickness of the film between 20 and 110 nm. The relaxation times also do not show any dependence on the axial position within the films for the film thickness between 70 and 110 nm. In addition to the rotating molecules we observed a fraction of spatially diffusing molecules and completely immobile molecules. These molecules indicate the presence of thin (
Original languageEnglish (US)
Pages (from-to)784-788
Number of pages5
JournalACS Macro Letters
Volume1
Issue number6
DOIs
StatePublished - Jun 8 2012
Externally publishedYes

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