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Luminescence properties of metallopolymer-gold nanoparticle composites

Forster, Robert J. and Dennany, Lynn and Seery, Michael and Keyes, Tia E. (2005) Luminescence properties of metallopolymer-gold nanoparticle composites. Proceedings of SPIE - The International Society for Optical Engineering, 5825. pp. 609-614. ISSN 0277-786X

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Abstract

Thin films of the metallopolymer [Os(bpy)2 (PVP)10] 2+, where bpy is 2,21-dipyridyl and PVP is poly(4-vinylpyridine), luminesce at 750±12 nm upon excitation at 355nm. The luminescence decay responses can be described by a double exponential decay model in which the limiting lifetimes are 75±14 (population fraction of 0.9) and 35±8 ns (population fraction of 0.1) for films in contact with aqueous 0.1 M H2SO4- Electrochemistry has been used to create well defined concentrations of the luminescence quencher, Os 3+, within the films. Time resolved spectroscopy reveals that both dynamic and static processes contribute to luminescence quenching with a rate constant for electron transfer between the photoexcited Os2+* and the Os3+ centres of 1.3×107 M-1s -1 being observed. Stable gold nanoparticles have been created within the metal lopolymer by the chemical reduction of tetrachloroaurate. These nanocomposite materials exhibit enhanced emission intensity compared to the gold free films.