Modifying behaviour of Cu on the orientation of formate on ZnO(000(1)over-bar)-O

被引:9
|
作者
Gutiérrez-Sosa, A
Evans, TM
Woodhead, AP
Lindsay, R
Muryn, CA
Thornton, G [1 ]
Yoshihara, J
Parker, SC
Campbell, CT
Oldman, RJ
机构
[1] Univ Manchester, Dept Chem, Surface Sci Res Ctr, Manchester M13 9PL, Lancs, England
[2] Univ Washington, Dept Chem, Seattle, WA 98195 USA
[3] ICI Chem & Polymers Ltd, Runcorn WA7 4QE, Cheshire, England
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; copper; zinc oxide; carboxylic acid; low index single crystal surfaces;
D O I
10.1016/S0039-6028(00)01074-8
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 orientation of formic acid (HCOOH) on ZnO(000 (1) over bar)-O and the effect of co-adsorbed Cu have been studied using polarisation dependent C K-edge near edge X-ray absorption fine structure. Formate created by exposure of the substrate to 20 L of HCOOH at 110 K and heating to 340 K is tilted by 55 +/- 5 degrees with respect to the surface normal. Pre-absorbing Cu to create 2D islands covering about half the substrate results in an apparent tilt angle of 32 +/- 5 degrees with respect to the surface normal. Since this is dose to the magic angle, the apparent tilt could arise from a random orientation of the molecule, The origin of the apparent tilt is likely to be buckling of the Cu(110)-like islands. (C) 2001 Elsevier Science B.V. All rights reserved.
引用
收藏
页码:1 / 7
页数:7
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