Reflectance properties of TiO 2 /Ag-Au nanoparticles in nanocomposite layers (original) (raw)

Optical and structural measurements of nanocomposites consisting of TiO 2 thin films with Au and Ag nanoparticles, which have been fabricated using a novel method developed in our group, were performed to determine the index of refraction of such films. The observed extinction spectra show the localized surface plasmon resonance typical of the metal nanoparticles, whereas reflectance exhibits a minimum at wavelength below this resonance. Another method to grow Au-NPs at the surface of previous Au-TiO 2 nanocomposites thin films is demonstrated, with the advantage to control the filling factor of these free Au nanoparticles.