Photoisomerization of azobenzene probes tagged to polystyrene in thin films

Keiji Tanaka, Yohei Tateishi, Toshihiko Nagamura

    Research output: Contribution to journalArticlepeer-review

    15 Citations (Scopus)

    Abstract

    The photoisomerization kinetics of azobenzene (Az) chromophores tagged to polystyrene (PS) in thin films, was analyzed. It was observed that absorbance monotonically increased with decreasing wavelength, even though the Az probes were not present in the film. To confirm whether the presence of the surface layer truly accelerates the trans to cis photoisomerization, a 160 nm thick film of PS was put onto the PS-Az film with the thickness of 40 nm. The bilayer's x value decreased to 0.67 ∓ 0.01 because of the interfacial region was composed of the two original surfaces. The results show that surface region dynamically behaves as liquid for the photoinduced trans to cis isomerization of the Az probes.

    Original languageEnglish
    Pages (from-to)8188-8190
    Number of pages3
    JournalMacromolecules
    Volume37
    Issue number22
    DOIs
    Publication statusPublished - Nov 2 2004

    All Science Journal Classification (ASJC) codes

    • Organic Chemistry
    • Polymers and Plastics
    • Inorganic Chemistry
    • Materials Chemistry

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