Optical properties of dielectric films dispersed with metal nanoparticles and applications to optically functional materials

Moriaki Wakaki; Eisuke Yokoyama

doi:10.1117/12.899589

23 August 2011 Optical properties of dielectric films dispersed with metal nanoparticles and applications to optically functional materials

Moriaki Wakaki, Eisuke Yokoyama

Author Affiliations +

Proceedings Volume 8173, Photonics 2010: Tenth International Conference on Fiber Optics and Photonics; 81731G (2011) https://doi.org/10.1117/12.899589
Event: International Conference on Fiber Optics and Photonics, 2010, Guwahati, India

Abstract

Nanoparticles of noble metals exhibit variety of colors in the visible light region due to a surface plasmon resonance. The size-induced properties of nanoparticles enable addition of flexibility to existing systems in many areas. To design a material with desired electrical and optical properties is the aim in many composite materials. In this paper, we report the preparation and characterization of silver nanoparticles in SiO₂, TiO₂ and ZrO₂ films and gold nanoparticles in TiO2 and ZrO₂ films. To analyze the dielectric characteristic of the metal-dielectric nanocomposite film, three kinds of matrices with a different refractive index were compared. Titanium dioxide (TiO₂) is one of the most promising photocatalysts and actively used in various practical applications. However, only a narrow band in the ultraviolet region of solar light, about 3-4%, is available for photocatalytic reaction. Therefore, the development of TiO₂ photocatalysts with higher photoelectric conversion efficiency for visible light is required. Plasmon-induced photocatalytic activity in the ultraviolet and visible light region was studied for the TiO₂ thin film dispersed with gold nanoparticles. Photocatalytic activity of Au/TiO₂ film was analyzed by degradation of stearic acid, and compared with non-doped TiO₂film.

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Moriaki Wakaki and Eisuke Yokoyama "Optical properties of dielectric films dispersed with metal nanoparticles and applications to optically functional materials", Proc. SPIE 8173, Photonics 2010: Tenth International Conference on Fiber Optics and Photonics, 81731G (23 August 2011); https://doi.org/10.1117/12.899589

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