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J Nanosci Nanotechnol. 2013 Jul;13(7):4943-8.

A comparative study of photo-assisted deposition of silver nanoparticles on TiO2.

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Laboratorio de Catálisis y Materiales, ESIQIE-Instituto Politécnica Nacional, Zacatenco, 07738 México D.F, Mexico.


Noble metals deposited on TiO2 act as electron traps facilitating electron-hole separation and promoting the interfacial electron transfer process. In particular, silver nanoparticles have the ability to absorb visible light due to localized surface plasmon resonance. Here we report a photochemical and photocatalytic method for depositing Ag nanoparticles (2-20 nm) on TiO2 by using UV light at room temperature. UV-Vis diffuse reflectance spectroscopy, transmission electron microscopy, X-ray photoelectron spectroscopy and time-resolved microwave conductivity were used as characterization techniques. The photocatalytic activity was investigated by measuring the decomposition of rhodamine B under UV and visible light irradiation. The fastest bleaching of RhB under visible-light irradiation has been obtained by Ag/TiO2 plasmonic photocatalyst prepared by the photocatalytic route. These results were explained in terms of the more efficient photon absorption due to the presence of the surface plasmon resonance.

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