Scanning Tunneling Microscopy Study of Surface Reconstructions of Rutile TiO2(111)

概要

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Structure of the rutile TiO2(111) surface prepared in ultra-high vacuum (UHV) was investigated by scanning tunneling microscopy (STM) and low-energy electron diffraction (LEED) for the first time. It is expected from the crystal structure that the stoichiometric TiO2(111) surface has more separated Ti metal sites compared to the well-studied rutile TiO2(110) surface. When the surface was annealed at 1024 K in UHV without Ar+ ion sputtering, a phase indexed as $\left(\begin{smallmatrix} 1 &{-}1\\ 1 &1 \end{smallmatrix}\right)$ was observed where atomic-scale protrusions (probably Ti atoms) were ordered rectangularly. After several cycles of Ar+ ion sputtering and annealing up to 976 K, ($1\times 1$) and double-domain ($1\times 2$) small patches appeared on the surface. These three phases were unstable against high-temperature annealing in vacuum, probably because they are sensitive to surface stoichiometry.
INSTITUTE OF PURE AND APPLIED PHYSICSの論文
2000-06-30