Study of Clean TiO2(110) Surface by Scanning Tunneling Microscopy and Spectroscopy

The effect of annealing in UHV on the topographic and electronic structure of the TiO 2 (110) surface was studied by scanning tunneling microscopy and spectroscopy. Different (1× n ) reconstructions with domain sizes of 5−10 nm were clearly identified in the crystallographic orientation [001]. Two other types of reconstruction with periodicities of 1.69 and 1.82 nm were detected perpendicular to the [11̄1] and [1̄13] crystallographic shear directions. The comparison of I / V and d I /d V spectra recorded on (1×1) and (1×2) terraces and on a disordered phase suggests a definite difference in the oxidation state of the surface Ti atoms of these arrangements.