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Issue 20, 2009
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Design of optically active nanoclusters of gold particles with mesostructured silica coating

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Abstract

Monodispersed, nanosized gold-mesoporous silica nanospheres in the size range 80–280 nm with specific optical properties are prepared in two steps: i) controlled aggregation of gold nanoparticles (GNP) in nanoclusters embedded in a uniform coating of amorphous silica, and ii) development of a porous regular and ordered silica shell by pseudomorphic transformation of the external layer. By careful manipulation of the synthesis variables, i.e., the concentration of co-solvent, surfactant and alkali, it is possible to obtain nanoparticles with controlled morphological and textural characteristics and desired optical behaviour. An optimized sample with most of the nanoparticles containing a multinucleus core made of 10 or more GNP shows a strong absorption cross-section in the near-infrared (NIR) region and a significant photothermal effect when irradiated with a λ = 808 nm laser diode module.

Graphical abstract: Design of optically active nanoclusters of gold particles with mesostructured silica coating

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Publication details

The article was received on 13 Nov 2008, accepted on 24 Feb 2009 and first published on 31 Mar 2009


Article type: Paper
DOI: 10.1039/B820293A
Citation: J. Mater. Chem., 2009,19, 3168-3175
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    Design of optically active nanoclusters of gold particles with mesostructured silica coating

    P. Botella, A. Corma, M. T. Navarro and M. Quesada, J. Mater. Chem., 2009, 19, 3168
    DOI: 10.1039/B820293A

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