Structural and Optical Properties Evolution of Au/SiO2 Nanocomposite Films: The Influence of Substrate Temperature and Thermal Annealing

Abstract

Au/SiO 2 nanocomposite films, studied in this work, were prepared by RF-magnetron sputtering technique on glass substrate at room temperature under two different substrate temperatures (Ts), and subsequent heat treatment. For the deposited sample at T S = 25˚C, no apparent surface plasmon resonance peak could be observed. After annealing, optical absorption spectrum of the Au/SiO 2 thin films showed a broad absorption band around 500 nm relating to gold nanoparticles without any modification in the position of the SPR and the size of particles. For the series deposited at T S = 400˚C, the surface plasmon resonance (SPR) was found at 500 nm. After heat treatment it's redshift from 500 nm to 503 nm, while the size increases from 2.01 nm to 2.3 nm. We have also shown that, as the AuNPs are embedded in silica films, the small nanoparticles size have a slightly larger expansion coefficient than for bigger one.

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“…[105] The plasmonic effect is strongly dependent on the material composition, size, shape, and periodicity, so various structures have been explored. [106,107] The SSP generates a strongly enhanced optical field in the local region between a metal and a dielectric, giving rise to strong light-matter interactions in the specific hot spot locations. However, a drawback of plasmonic nanostructures is that they suffer from large ohmic losses by metal absorption.…”