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

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<mark>Journal publication date</mark>2006
<mark>Journal</mark>Physical Chemistry Chemical Physics
Issue number12
Number of pages7
Pages (from-to)1430-1436
Publication StatusPublished
<mark>Original language</mark>English


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 ω- 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 ∼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. © the Owner Societies 2006.