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Effects of the solid/liquid interface on the excimer formation of pyrene in toluene containing poly (methyl methacrylate). A time-resolved total internal reflection fluorescence study

✍ Scribed by Sanyo Hamai; Naoto Tamai; Hiroshi Masuhara

Publisher: Elsevier Science
Year: 1993
Tongue: English
Weight: 463 KB
Volume: 213
Category: Article
ISSN: 0009-2614
DOI: 10.1016/0009-2614(93)85154-g

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✦ Synopsis

By means of time-resolved total internal reflection (TIR) fluorescence measurements, rise and decay profiles of the pyrene excimer fluorescence were examined in toluene containing 3.3x 10e4 mol dm-" of poly(methy1 methacrylate) (PMMA, MW= 120000). In addition to a reduction of the fluorescence intensity of the pyrene excimer relative to the monomer, the rise and decay rates of the excimer fluorescence were decelerated in a sapphire/toluene interface layer of a thickness less than 60 nm. These findings were interpreted by an increase in the viscosity of the interface layer including PMMA adsorbed on a sapphire

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