Plasmon interactions between gold nanoparticles in aqueous solution with controlled spatial separation

I.E. Sendroiu, Stijn Mertens, D.J. Schiffrin

Research output: Contribution to journalJournal articleResearchpeer-review

Abstract

The effects of interparticle distance on the UV-visible absorption spectrum of gold nanocrystals aggregates in aqueous solution have been investigated. The aggregates were produced by ion-templated chelation of omega-mercaptocarboxylic acid ligands covalently attached to the nanoparticles surface. Variation of the ligand chain length provides control over the interparticle separation in the aggregates. The UV-visible spectra consist typically of a single particle band and a secondary band at higher wavelengths associated with the formation of aggregates in solution. The position of the latter depends on interparticle separation up to distances of similar to 8 nm, in accordance with existing models. Potential applications therefore include distance sensitive labels or proximity probes. Conversely, variation of the ligand length allows the preparation of nanostuctured materials with tuned optical properties.
Original languageEnglish
JournalPhysical Chemistry Chemical Physics
Volume8
Issue number12
Pages (from-to)1430-1436
ISSN1463-9076
Publication statusPublished - 2006

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