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Issue 32, 2005
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Synthesis of Au nanoparticle doped SiO2–TiO2 films: tuning of Au surface plasmon band position through controlling the refractive index

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Abstract

The position of the surface plasmon resonance (SPR) band of Au nanoparticles was tailored by controlling the refractive indices (n) of the embedding matrices, to develop different coloured coatings on glass substrates. Five sets of Au nanoparticle doped coatings were prepared from sols derived from tetraethyl orthosilicate–3-(glycidoxypropyl)trimethoxysilane–titanium tetraethoxide containing gold chloride, following a sol-gel dip-coating method. The film samples of nominal formula (SiO2)x(TiO2)0.97−xAu0.03 (x = 0.97, 0.679, 0.485, 0.388 and 0.242) were prepared after heat treatment at 500 °C in air. The Au SPR peak, in the case of a SiO2 host (SiO2 : TiO2 = 1 : 0, n = 1.411), observed at 542 nm, gradually red-shifted to 600 nm upon increasing the TiO2 content (SiO2 : TiO2 = 1 : 3, n = 1.939). As a consequence, a systematic change of the Au SPR position yielded pink, magenta, violet, royal and blue coloured coatings on ordinary sheet glasses. The formation of Au nanoparticles in the above gel and glassy coating matrices was monitored by UV–visible and FTIR spectroscopy, X-ray diffraction and transmission electron microscopy.

Graphical abstract: Synthesis of Au nanoparticle doped SiO2–TiO2 films: tuning of Au surface plasmon band position through controlling the refractive index

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Supplementary files

Article information


Submitted
06 May 2005
Accepted
23 Jun 2005
First published
05 Jul 2005

J. Mater. Chem., 2005,15, 3278-3284
Article type
Paper

Synthesis of Au nanoparticle doped SiO2–TiO2 films: tuning of Au surface plasmon band position through controlling the refractive index

S. K. Medda, S. De and G. De, J. Mater. Chem., 2005, 15, 3278
DOI: 10.1039/B506399J

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