Analysis of thermal molecular motion on substrate interface by time- And space-resolved fluorescence spectroscopy

Yu Tsuchimura, Keiji Tanaka, Toshihiko Nagamura

    Research output: Contribution to conferencePaperpeer-review

    Abstract

    Fluorescence lifetime for 6-(N-(7-nitrobenz-2-oxa-1,3-diazol-4-yl)amino) hexanoic acid (NBD) tagged to polystyrene (PS) in a film on a sapphire substrate was examined as a function of temperature. Picosecond pulse with the wavelength of 430 nm generated by a mode-locked Ti:Sapphire laser was irradiated from the substrate side. Information near the substrate interface was successfully extracted on the basis of evanescent wave excitation. The lifetime for NBD monotonically decreased with increasing temperature because the fractional amount of non-radiative pathways to the ground state for excited species increased with temperature. In general, as measuring temperature goes beyond a temperature at which molecular motion releases, the slope for the temperature-lifetime changes. In this experiment, the inflection point related to the slope was higher in the interfacial region than in the internal bulk phase of the film. Thus, it was concluded that chain mobility in the interfacial region was restricted in comparison with that in the bulk phase.

    Original languageEnglish
    Pages3842-3843
    Number of pages2
    Publication statusPublished - Dec 1 2005
    Event54th SPSJ Symposium on Macromolecules - Yamagata, Japan
    Duration: Sep 20 2005Sep 22 2005

    Other

    Other54th SPSJ Symposium on Macromolecules
    Country/TerritoryJapan
    CityYamagata
    Period9/20/059/22/05

    All Science Journal Classification (ASJC) codes

    • Engineering(all)

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