Share Email Print
cover

Proceedings Paper

A transient molecular probe for characterizing the surface properties of TiO2 nanoparticle in colloidal solution
Author(s): Yu-Xiang Weng; Lu-Chao Du; Qing-Li Zhang
Format Member Price Non-Member Price
PDF $14.40 $18.00
cover GOOD NEWS! Your organization subscribes to the SPIE Digital Library. You may be able to download this paper for free. Check Access

Paper Abstract

A transient molecular probe for characterization of the surface properties of TiO2 nanoparticles in colloidal solution has been developed recently in our laboratory. The probe molecule is all-trans-retinoic acid (ATRA) adsorbed on the TiO2 nanoparticle surface. After photoexcitation, the photoinduced interfacial charge recombination would generate ATRA triplet state (ATRAT) with a substantial quantum yield. While the quantum yield of triplet ATRA generated in the solution phase is substantially low, which renders the interfacial-charge-recombination generated triplet ATRA being a transient probe molecule specific only to the interface. It is found that the triplet-triplet absorption spectrum of ATRA adsorbed molecule is sensitive to its binding form with the surface Ti atom through the carboxylic group, as well as to the polarity of the medium. Especially the apparent lifetime of ATRAT at the TiO2 surface changes substantially when the local polarity around the TiO2 nanoparticle changes. We found that the ATRAT monolayer adsorbed at the TiO2 surface can be used as a transient molecular probe for the surface binding forms, coordination state of the surface Ti atoms and the light-induced wettability change of the TiO2 nanoparticle. TiO2 nanoparticle, all-trans-retinoic acid, molecular probe, interfacial charge recombination, surface binding form, light-induced wettability change.

Paper Details

Date Published: 30 August 2006
PDF: 9 pages
Proc. SPIE 6325, Physical Chemistry of Interfaces and Nanomaterials V, 63250Y (30 August 2006); doi: 10.1117/12.678295
Show Author Affiliations
Yu-Xiang Weng, Institute of Physics (China)
Lu-Chao Du, Institute of Physics (China)
Qing-Li Zhang, Institute of Physics (China)


Published in SPIE Proceedings Vol. 6325:
Physical Chemistry of Interfaces and Nanomaterials V
Mark Spitler; Frank Willig, Editor(s)

© SPIE. Terms of Use
Back to Top