Orientation of carboxylates on TiO2(110)

被引：75
|
作者：
Gutiérrez-Sosa, A [1 ]
Martínez-Escolano, P [1 ]
Raza, H [1 ]
Lindsay, R [1 ]
Wincott, PL [1 ]
Thornton, G [1 ]
机构：
[1] Univ Manchester, Surface Sci Res Ctr, Dept Chem, Manchester M13 9PL, Lancs, England
来源：
SURFACE SCIENCE | 2001年 / 471卷 / 1-3期
基金：
英国工程与自然科学研究理事会;
关键词：
near edge extended X-ray absorption fine structure (NEXAFS); chemisorption; surface structure; morphology; roughness; and topography; titanium oxide; carboxylic acid; low index single crystal surfaces;
D O I：
10.1016/S0039-6028(00)00902-X
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：
C K-edge NEXAFS has been used to examine the orientation of formate. acetate and propanate in their 2 x 1 overlayers on TiO2(1 1 0) at 300 K. These data indicate that the carboxylate planes are more or less perpendicular to the surface. The off-normal tilt angles from NEXAFS are 20 +/- 10 degrees, 0 +/- 5 degrees and 14 +/- 10 degrees for formate, acetate and propanate, respectively. The corresponding apparent twist angles out of the [0 0 1] azimuth are 29 +/- 10 degrees. 26 +/- 5 degrees and 39 +/- 10 degrees, indicating a bond geometry essentially independent of the alkyl chain length. The apparent twist angles probably arise from averaging of majority and minority species. (C) 2001 Elsevier Science B.V. All rights reserved.
引用
收藏
页码：163 / 169
页数：7
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