A SCANNING TUNNELING MICROSCOPY AND SPECTROSCOPY STUDY OF THE TIO(2-X)(110) SURFACE

被引：89

作者：

ROHRER, GS

HENRICH, VE

BONNELL, DA

机构：

[1] YALE UNIV,DEPT APPL PHYS,SURFACE SCI LAB,NEW HAVEN,CT 06520

[2] UNIV PENN,DEPT MAT SCI & ENGN,PHILADELPHIA,PA 19104

来源：

SURFACE SCIENCE | 1992年 / 278卷 / 1-2期

基金：

美国国家科学基金会;

关键词：

D O I：

10.1016/0039-6028(92)90590-3

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 structure of reduced TiO2-x(110) has been studied in ultrahigh-vacuum by scanning tunneling microscopy and tunneling spectroscopy. A variety of surface structure types with periodicities larger than the bulk TiO2 unit cell have been clearly resolved. These periodic structures, which have repeat distances ranging from 3.2 angstrom to greater than 30 angstrom, coexist with one another on the reduced surface and have domain sizes of < 1000 angstrom. Tunneling spectra acquired from this surface show the bulk conduction band edge 0.5 eV above the Fermi level and a bandgap greater than 2.5 eV. These observations are compared to a surface structure model that assumes the presence of varying concentrations of bulk crystallographic shear plane defects that accommodate non-stoichiometry in this material.

引用

页码：146 / 156

页数：11

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