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A novel method for the synthesis of monodisperse gold-coated silica nanoparticles

English, Michael D. & Waclawik, Eric R. (2012) A novel method for the synthesis of monodisperse gold-coated silica nanoparticles. Journal of Nanoparticle Research, 14(1), 650-1---10.

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Abstract

Monodisperse silica nanoparticles were synthesised by the well-known Stober protocol, then dispersed in acetonitrile (ACN) and subsequently added to a bisacetonitrile gold(I) coordination complex ([Au(MeCN)2]?) in ACN. The silica hydroxyl groups were deprotonated in the presence of ACN, generating a formal negative charge on the siloxy groups. This allowed the [Au(MeCN)2]? complex to undergo ligand exchange with the silica nanoparticles and form a surface coordination complex with reduction to metallic gold (Au0) proceeding by an inner sphere mechanism. The residual [Au(MeCN)2]? complex was allowed to react with water, disproportionating into Au0 and Au(III), respectively, with the Au0 adding to the reduced gold already bound on the silica surface. The so-formed metallic gold seed surface was found to be suitable for the conventional reduction of Au(III) to Au0 by ascorbic acid (ASC). This process generated a thin and uniform gold coating on the silica nanoparticles. The silica NPs batches synthesised were in a size range from 45 to 460 nm. Of these silica NP batches, the size range from 400 to 480 nm were used for the gold-coating experiments.

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ID Code: 50061
Item Type: Journal Article
Keywords: Monodisperse silica nanoparticles, Gold-coated silica nanoparticles, Surface coordination complex, Gold-shell nanoparticles, Inner sphere mechanism, Composite gold colloid
DOI: 10.1007/s11051-011-0650-2
ISSN: 1572-896X
Subjects: Australian and New Zealand Standard Research Classification > CHEMICAL SCIENCE (030000)
Divisions: Current > Schools > School of Chemistry, Physics & Mechanical Engineering
Current > QUT Faculties and Divisions > Science & Engineering Faculty
Copyright Owner: Copyright 2012 Springer
Copyright Statement: The original publication is available at SpringerLink http://www.springerlink.com
Deposited On: 02 May 2012 14:35
Last Modified: 02 May 2012 14:52

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