A transient molecular probe for characterizing the surface properties of TiO2 nanoparticle in colloidal solution

Yu-Xiang Weng; Lu-Chao Du; Qing-Li Zhang

doi:10.1117/12.678295

30 August 2006 A transient molecular probe for characterizing the surface properties of TiO₂ nanoparticle in colloidal solution

Yu-Xiang Weng, Lu-Chao Du, Qing-Li Zhang

Author Affiliations +

Proceedings Volume 6325, Physical Chemistry of Interfaces and Nanomaterials V; 63250Y (2006) https://doi.org/10.1117/12.678295
Event: SPIE Optics + Photonics, 2006, San Diego, California, United States

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 (ATRA^T) 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 ATRA^T 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.

Citation Download Citation

Yu-Xiang Weng, Lu-Chao Du, and Qing-Li Zhang "A transient molecular probe for characterizing the surface properties of TiO₂ nanoparticle in colloidal solution", Proc. SPIE 6325, Physical Chemistry of Interfaces and Nanomaterials V, 63250Y (30 August 2006); https://doi.org/10.1117/12.678295

ACCESS THE FULL ARTICLE

INSTITUTIONAL
Select your institution to access the SPIE Digital Library.

SELECT YOUR INSTITUTION

PERSONAL
Sign in with your SPIE account to access your personal subscriptions or to use specific features such as save to my library, sign up for alerts, save searches, etc.

PERSONAL SIGN IN

No SPIE Account? Create one

PURCHASE THIS CONTENT

SUBSCRIBE TO DIGITAL LIBRARY

50 downloads per 1-year subscription

Members: $195

Non-members: $335 ADD TO CART

25 downloads per 1 - year subscription

Members: $145

Non-members: $250 ADD TO CART

PURCHASE SINGLE ARTICLE

Includes PDF, HTML & Video, when available