Luminescence properties of metallopolymer-gold nanoparticle composites

Robert J. Forster; Lynn Dennany; Michael Seery; Tia E. Keyes

doi:10.1117/12.606155

3 June 2005 Luminescence properties of metallopolymer-gold nanoparticle composites

Robert J. Forster, Lynn Dennany, Michael Seery, Tia E. Keyes

Proceedings Volume 5825, Opto-Ireland 2005: Optoelectronics, Photonic Devices, and Optical Networks; (2005) https://doi.org/10.1117/12.606155
Event: OPTO-Ireland, 2005, Dublin, Ireland

Abstract

Thin films of the metallopolymer [Os(bpy)₂ (PVP)₁₀]²⁺, where bpy is 2,2'-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, Os³⁺, 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 1.3x10⁷ M^-1s^-1 being observed. Stable gold nanoparticles have been created within the metallopolymer by the chemical reduction of tetrachloroaurate. These nanocomposite materials exhibit enhanced emission intensity compared to the gold free films.

Citation Download Citation

Robert J. Forster, Lynn Dennany, Michael Seery, and Tia E. Keyes "Luminescence properties of metallopolymer-gold nanoparticle composites", Proc. SPIE 5825, Opto-Ireland 2005: Optoelectronics, Photonic Devices, and Optical Networks, (3 June 2005); https://doi.org/10.1117/12.606155

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