ESDIAD studies of the structure of TiO2(110) (1x1) and (1x2) surfaces and interfaces in conjunction with LEED and STM

被引:31
作者
Cocks, ID
Guo, Q
Williams, EM
机构
[1] UNIV LIVERPOOL,SURFACE SCI RES CTR,LIVERPOOL L69 3BX,MERSEYSIDE,ENGLAND
[2] UNIV LIVERPOOL,DEPT ELECT ENGN & ELECT,LIVERPOOL L69 3BX,MERSEYSIDE,ENGLAND
基金
英国工程与自然科学研究理事会;
关键词
acetic acid; adsorbate structure; carboxylic acids; chemisorption; DIET; electron stimulated desorption ion angular distribution; scanning tunnelling microscopy; titanium dioxide;
D O I
10.1016/S0039-6028(97)00528-1
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 TiO2(110)-(1 x 1) surface and its reconstruction as a (1 x 2) form have been studied with low energy electron diffraction (LEED), electron stimulated desorption ion angular distribution (ESDLAD) and scanning tunnelling microscopy (STM). Oxygen ion desorption occurs within a lobe perpendicular to the (1x1) surface, changing to two off-normal lobes for the (1x2) reconstruction. This transformation in the ESDIAD pattern is consistent with the added Ti2O3 row model of the (1 x 2) reconstruction proposed by Onishi and Iwasawa. STM studies of the stoichiometric and electron irradiated surfaces reinforce the association of the O+ ESD contribution with majority sites at the surface. Adsorption of acetic acid on the (1 x I) surface produces a (2 x 1) overlayer and induces a reconstruction of the underlying substrate. ESDIAD reveals H+ ions emitted off-normally from dissociatively adsorbed acetate, and along the surface normal from surface hydroxyls. Adsorption of acetic acid on the (1 x 2) surface does not modify the LEED pattern, but ESDIAD reveals H+ desorption with a weaker off-normal contribution consistent with the Ti2O3 model of the reconstruction. (C) 1997 Elsevier Science B.V.
引用
收藏
页码:119 / 125
页数:7
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