Water-stable, hydroxamate anchors for functionalization of TiO2 surfaces with ultrafast interfacial electron transfer

被引：96

作者：

McNamara, William R. ^{[1
]}

Milot, Rebecca L. ^{[1
]}

Song, Hee-eun ^{[1
]}

Snoeberger, Robert C., III ^{[1
]}

Batista, Victor S. ^{[1
]}

Schmuttenmaer, Charles A. ^{[1
]}

Brudvig, Gary W. ^{[1
]}

Crabtree, Robert H. ^{[1
]}

机构：

[1] Yale Univ, Dept Chem, New Haven, CT 06520 USA

来源：

ENERGY & ENVIRONMENTAL SCIENCE | 2010年 / 3卷 / 07期

关键词：

NANOPARTICLES; SIDEROPHORE; COMPLEXES; OXIDATION; LIGHT;

D O I：

10.1039/c001065k

中图分类号：

O6 [化学];

学科分类号：

0703 ;

摘要：

A novel class of derivatized hydroxamic acid linkages for robust sensitization of TiO2 nanoparticles (NPs) under various aqueous conditions is described. The stability of linkages bound to metal oxides under various conditions is important in developing photocatalytic cells which incorporate transition metal complexes for solar energy conversion. In order to compare the standard carboxylate anchor to hydroxamates, two organic dyes differing only in anchoring groups were synthesized and attached to TiO2 NPs. At acidic, basic, and close to neutral pH, hydroxamic acid linkages resist detachment compared to the labile carboxylic acids. THz spectroscopy was used to compare ultrafast interfacial electron transfer (IET) into the conduction band of TiO2 for both linkages and found similar IET characteristics. Observable electron injection and stronger binding suggest that hydroxamates are a suitable class of anchors for designing water stable molecules for functionalizing TiO2.

引用

页码：917 / 923

页数：7

共 31 条

[1] Ultrafast photooxidation of Mn(II)-Terpyridine complexes covalently attached to TiO2 nanoparticles [J].