Transparent, Homogeneous Tin Oxide (SnO2) Thin Films Containing SnO2-Coated Gold Nanoparticles
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Abstract
A sol–gel-based approach to the fabrication of tin oxide (SnO2) thin films containing SnO2-coated gold nanoparticles is described. In this approach, gold nanoparticles with a mean diameter of ∼15 nm were coated with thin layers of SnO2. The composite particles were ∼55 nm in diameter with SnO2 shells that were ∼20 nm thick. These nanoparticles were doped homogeneously into a SnO2 sol–gel precursor, and the mixture was deposited as a thin film via spin-coating methods. The SnO2-coated nanoparticles and the SnO2 films doped with the nanoparticles were characterized by transmission and scanning electron microscopy (TEM and SEM) and X-ray diffraction (XRD). The optical properties of the nanoparticles and the composite films were evaluated by UV–vis spectroscopy.
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