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American Chemical Society, Journal of Physical Chemistry C, 41(118), p. 24055-24061, 2014

DOI: 10.1021/jp505702g

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Changes in the Chemical and Structural Properties of Nanocomposite Ag:TiO2 Films during Photochromic Transitions

Journal article published in 2014 by Nicolas Crespo-Monteiro, Nathalie Destouches, Thierry Epicier, Lavinia Balan ORCID, Francis Vocanson, Yaya Lefkir, Jean-Yves Michalon
This paper was not found in any repository; the policy of its publisher is unknown or unclear.
This paper was not found in any repository; the policy of its publisher is unknown or unclear.

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Abstract

This study focuses on changes in the oxidation state of silver and in the crystalline phase of TiO2 occurring during the photochromic transitions of amorphous nanocomposite mesoporous Ag:TiO2 films exposed to ultraviolet and visible laser light. The chemical and phase transformations have been investigated by ultraviolet–visible spectroscopy, X-ray photoelectron spectroscopy, transmission electron microscopy, high-angle annular dark field scanning transmission electron microscopy, and high-resolution transmission electron microscopy. The results bring to the fore the presence of both silver nanoparticles in face-centered cubic and hexagonal crystalline phases during the photochromic transitions and a large amount of oxidized silver nanoparticles after visible light exposure, along with nucleation of some TiO2 crystals despite the very low intensity used.