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Multicolour photochromism of TiO2 films loaded with silver nanoparticles

Multicolour photochromism of TiO2 films loaded with silver nanoparticles Photochromic materials, which change their colours reversibly in response to light, can be applied to smart windows, displays and memories 1,2,3 . Conventional photochromic materials respond in a monochromatic way, so that multicolour photochromism has required several different materials or filters combined appropriately. If multicolour photochromism could be achieved with a simple material, photochromic devices would be find a greater number of applications, including a rewritable colour copy paper or electronic paper 4 and a high-density multi-wavelength optical memory. Here we report multicolour photochromism of TiO2 films loaded with silver nanoparticles by photocatalytic means. Its colour, initially brownish-grey, changes under monochromatic visible light to almost the same colour as that of the light; the apparently uniform Ag–TiO2 film can be almost any colour. Behaviour similar to persistent hole-burning effects 5,6 is also observed. The colour reverts to brownish-grey under ultraviolet light, and these processes are repeatable. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Nature Materials Springer Journals

Multicolour photochromism of TiO2 films loaded with silver nanoparticles

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References (16)

Publisher
Springer Journals
Copyright
Copyright © 2002 by Nature Publishing Group
Subject
Materials Science; Materials Science, general; Optical and Electronic Materials; Biomaterials; Nanotechnology; Condensed Matter Physics
ISSN
1476-1122
eISSN
1476-4660
DOI
10.1038/nmat796
Publisher site
See Article on Publisher Site

Abstract

Photochromic materials, which change their colours reversibly in response to light, can be applied to smart windows, displays and memories 1,2,3 . Conventional photochromic materials respond in a monochromatic way, so that multicolour photochromism has required several different materials or filters combined appropriately. If multicolour photochromism could be achieved with a simple material, photochromic devices would be find a greater number of applications, including a rewritable colour copy paper or electronic paper 4 and a high-density multi-wavelength optical memory. Here we report multicolour photochromism of TiO2 films loaded with silver nanoparticles by photocatalytic means. Its colour, initially brownish-grey, changes under monochromatic visible light to almost the same colour as that of the light; the apparently uniform Ag–TiO2 film can be almost any colour. Behaviour similar to persistent hole-burning effects 5,6 is also observed. The colour reverts to brownish-grey under ultraviolet light, and these processes are repeatable.

Journal

Nature Materials – Springer Journals

Published: Dec 15, 2002

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