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Morphological Changes and Multicolor Photochromism of Ag Nanoparticles Deposited on Single-crystalline TiO2 Surfaces

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  • We are grateful to Dr. Y. Ohko and Dr. N. Sakai for valuable discussions. This work was supported in part by Grants-in-Aid for Scientific Research (Nos. 14050028 (Area 417) and 17350064) from MEXT, Japan and JSPS, respectively and JST. K.M. thanks the JSPS Research Fellowship for Young Scientists.

Abstract

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Silver gets fat and thin: Ag nanoparticles photocatalytically deposited on rutile TiO2 single crystals exhibit multicolor photochromism. Under monochromatic visible light, particles resonant with the light are photoelectrochemically dissolved, and re-deposited on the TiO2 substrate or non-resonant particles. These size-selective dissolution and growth are responsible for the wavelength-dependent color changes.

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