Proline adsorption on TiO2(110) single crystal surface:: A study by high resolution photoelectron spectroscopy

被引：43

作者：

Fleming, G. J. ^{[1
]}

Adib, K. ^{[2
]}

Rodriguez, J. A. ^{[2
]}

Barteau, M. A. ^{[3
]}

Idriss, H. ^{[1
]}

机构：

[1] Univ Auckland, Dept Chem, Auckland, New Zealand

[2] Brookhaven Natl Labs, Dept Chem, Upton, NY 11973 USA

[3] Univ Delaware, Dept Chem Engn, Newark, DE 19716 USA

来源：

SURFACE SCIENCE | 2007年 / 601卷 / 24期

关键词：

TiO2(110) single crystal; proline adsorption; zwitterion; high resolution X-ray photoelectron spectroscopy;

D O I：

10.1016/j.susc.2007.06.074

中图分类号：

O64 [物理化学（理论化学）、化学物理学];

学科分类号：

070304 ; 081704 ;

摘要：

The surface chemistry and binding Of DL-proline were investigated on the oxidised (stoichiometric) and reduced (sub-stoichiometric) TiO2(110) single crystal surfaces. TiO2 was chosen as the substrate as it best represents the surface of a biomedical implant, which bio-molecules interact with during the healing of bone/teeth fractures (molecular recognition). High resolution X-ray photoelectron spectroscopy (HR-XPS) studies of the Cls and Nls regions revealed that DL-proline is present in two forms (dissociated and zwitterionic) on the oxidised TiO2 surface. On TiO2(110) surfaces reduced by Ar+ sputtering, a significant increase in the amount of zwitterionic proline at the surface was detected when compared with the oxidised surface. Study of the temperature effect showed that in both cases the zwitterionic structure was the less stable structure. The reason for its relative instability appears to be thermodynamic. (C) 2007 Elsevier B.V. All rights reserved.

引用

页码：5726 / 5731

页数：6

共 35 条

[1] THE INTERFACE ZONE OF INORGANIC IMPLANTS INVIVO - TITANIUM IMPLANTS IN BONE [J].