Scanning Tunneling Microscopy Study of Surface Reconstructions of Rutile TiO2(111)
Scanning Tunneling Microscopy Study of Surface Reconstructions of Rutile TiO2(111)
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金红石TiO2(111)表面重构的扫描隧道显微镜研究
DOI：
10.1143/jjap.39.3769
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发表时间：
2000
影响因子：
1.5
通讯作者：
H. Onishi
中科院分区：
文献类型：
--
作者：
H. Uetsuka;A. Sasahara;H. Onishi
首次用扫描隧道显微镜(STM)和低能电子衍射(LEED)研究了在超高真空(UHV)中制备的金红石型二氧化钛(111)表面的结构。从晶体结构来看，化学计量比的二氧化钛(111)表面比金红石型的二氧化钛(110)表面有更多的分离的钛金属位。当表面在1024K的超高真空中无Ar+离子溅射时，观察到指数为(1&-11&1)的相，原子尺度的突起(可能是钛原子)呈矩形排列。在Ar~(2+)离子溅射和976K退火的几次循环后，表面出现了(1×1)和(1×2)双磁区小斑块。Thesethreephaseswereunstableagainsthigh-temperatureannealinginvacuum，probablybecausetheyaresensitivetosurfacestoichiometry.
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 ( 1 &-1 1 &1 ) wasobservedwhereatomic-scaleprotrusions (probablyTiatoms) wereorderedrectangularly. AfterseveralcyclesofAr^+ ionsputteringandannealingupto 976 K, (1×1) anddouble-domain (1×2) smallpatchesappearedonthesurface. Thesethreephaseswereunstableagainsthigh-temperatureannealinginvacuum, probablybecausetheyaresensitivetosurfacestoichiometry.