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Controlling alloy formation and optical properties by galvanic replacement of sub-20 nm silver nanoparticles in organic media
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Submitted Version
Date
2015-06
Authors
Collins, Gillian
McCarthy, Eoin K.
Holmes, Justin D.
Journal Title
Journal ISSN
Volume Title
Publisher
The Royal Society of Chemistry
Published Version
Abstract
Galvanic replacement is a versatile synthetic strategy for the synthesis of alloy and hollow nanostructures. The structural evolution of single crystalline and multiply twinned nanoparticles <20 nm in diameter and capped with oleylamine is systematically studied. Changes in chemical composition are dependent on the size and crystallinity of the parent nanoparticle. The effects of reaction temperature and rate of precursor addition are also investigated. Galvanic replacement of single crystal spherical and truncated cubic nanoparticles follows the same mechanism to form hollow octahedral nanoparticles, a mechanism which is not observed for galvanic replacement of Ag templates in aqueous systems. Multiply twinned nanoparticles can form nanorings or solid alloys by manipulating the reaction conditions. Oleylamine-capped Ag nanoparticles are highly adaptable templates to synthesize a range of hollow and alloy nanostructures with tuneable localised surface plasmon resonance.
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Keywords
Noble-metal nanoparticles , Hollow gold , Nanostructures , Ag , Nanocrystals , Nanoframes
Citation
COLLINS, G., MCCARTHY, E. K. & HOLMES, J. D. 2015. Controlling alloy formation and optical properties by galvanic replacement of sub-20 nm silver nanoparticles in organic media. CrystEngComm, 17, 6999-7005. http://dx.doi.org/10.1039/C5CE00659G