Luminescence properties of metallopolymer-gold nanoparticle composites

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

doi:10.1117/12.606155

Luminescence properties of metallopolymer-gold nanoparticle composites

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

^*Corresponding author for this work

Pure And Applied Chemistry

Research output: Contribution to journal › Article › peer-review

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 H₂SO_4- 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.

Original language	English
Article number	99
Pages (from-to)	609-614
Number of pages	6
Journal	Proceedings of SPIE - The International Society for Optical Engineering
Volume	5825
DOIs	https://doi.org/10.1117/12.606155
Publication status	Published - 13 Jul 2005

Keywords

composite materials
electric excitation
gold
luminescence
polymers
reduction
thin films

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title = "Luminescence properties of metallopolymer-gold nanoparticle composites",

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.",

keywords = "composite materials, electric excitation, gold, luminescence, polymers, reduction, thin films",

author = "Forster, {Robert J.} and Lynn Dennany and Michael Seery and Keyes, {Tia E.}",

year = "2005",

month = jul,

day = "13",

doi = "10.1117/12.606155",

language = "English",

volume = "5825",

pages = "609--614",

journal = "Proceedings of SPIE - The International Society for Optical Engineering",

issn = "0277-786X",

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TY - JOUR

T1 - Luminescence properties of metallopolymer-gold nanoparticle composites

AU - Forster, Robert J.

AU - Dennany, Lynn

AU - Seery, Michael

AU - Keyes, Tia E.

PY - 2005/7/13

Y1 - 2005/7/13

N2 - 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.

AB - 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.

KW - composite materials

KW - electric excitation

KW - gold

KW - luminescence

KW - polymers

KW - reduction

KW - thin films

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JO - Proceedings of SPIE - The International Society for Optical Engineering

JF - Proceedings of SPIE - The International Society for Optical Engineering

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Luminescence properties of metallopolymer-gold nanoparticle composites

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