Plasmon interactions between gold nanoparticles in aqueous solution with controlled spatial separation |
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Authors: | Sendroiu Iuliana E Mertens Stijn F L Schiffrin David J |
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Institution: | Centre for Nanoscale Science, Chemistry Department, University of Liverpool, Liverpool, UKL69 7ZD. |
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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 approximately 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. |
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