Nanostructure of silver metal produced photocatalytically in TiO(sub 2) films and the mechanism of the resulting photochromic behavior

Article Abstract:

Optical activity of composite films created by the photocatalytic reduction of silver or gold ions in TiO(sub 2) upon irradiation by UV light are discussed in terms of the formation and light-induced destruction of distinct nanoparticles molded inside the porous nanocrystalline film. Analysis using classical electromagnetic calculations indicates that the photochromic properties of composite TiO(sub 2)/ silver films are explained well by thin metal coatings and small particles in heterogeneous external environments.

Semiconductors and related devices, Semiconductor and Related Device Manufacturing, Thin Film Materials, Nanotechnology, Thin films, Dielectric films, Structure

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Laser effehicts in SERS spectroscopy at tn metal films

Article Abstract:

An investigation of the laser power effects for silver island films and silver films over alumina nanoparticles in focused laser beams and at the tip of fiber-optic Surface-enhanced Raman Scattering (SERS) sensors is presented. The investigation revealed that an irreversible decrease of SERS enhancement was observed for laser powers above 2.5 mW in a focused laser beam on SERS substrates and above 20 mW at the tip of fiber-optic SERS sensors.

Metallic films

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Adsorbed sites of individual molecules on Ag nanoparticles in single molecule sensitivity-surface-enhanced Raman scattering

Article Abstract:

The blinking of surface-enhanced Raman scattering (SERS) signal was observed for Ag touching particles with an extremely small number of molecules progressively extinguished in 10-30 min probably due to thermal diffusion to marginal sites from the junction of complete desorption of adsorbates. A significant change in the elastic scattering spectra was found when observed with a white light source during the inactivation process of SERS.

Spectra, Chemistry, Physical and theoretical, Physical chemistry

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