Photoinduced Heating of Freestanding Azo-Polymer Thin Films Monitored by Scanning Thermal Microscopy

Sergey S. Kharintsev, Elena A. Chernykh, Alexandr I. Fishman, Semion K. Saikin, Alexander M. Alekseev, Myakzyum Kh Salakhov

Research output: Contribution to journalArticlepeer-review

11 Citations (Scopus)

Abstract

Despite numerous attempts to capture a temperature rise in azobenzene-functionalized polymer thin films exposed to laser irradiation, so far no attention has been paid to direct temperature measurements. Here, we characterize a photoinduced heating of freestanding thin films using nanoscale resolution scanning thermal microscopy. The polymer films under study are composed of epoxy-based oligomers with chemically attached nitroazobenzene chromophores. A temperature change of 1.7 K only is observed when an 800 nm thick film is subject to resonant 532 nm illumination with a modest intensity of 25 mW/cm2. A freestanding and glass substrate supported 20 nm azo-polymer films exhibit an anomalous depression of the glass transition temperature by approximately 80 and 70 K, respectively, that is probed with thermally assisted atomic force microscopy. Our results show that the photoinduced heating can negatively affect an ordered state of the azo dyes within the polymer ultrathin film (<100 nm) at room temperature.

Original languageEnglish
Pages (from-to)3007-3012
Number of pages6
JournalJournal of Physical Chemistry C
Volume121
Issue number5
DOIs
Publication statusPublished - Feb 9 2017

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Energy(all)
  • Physical and Theoretical Chemistry
  • Surfaces, Coatings and Films

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