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      Three-dimensional interaction force and tunneling current spectroscopy of point defects on rutile TiO2(110)

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      Author(s)
      Baykara, M. Z.
      Mönig, H.
      Schwendemann, T. C.
      Ünverdi, Ö.
      Altman, E. I.
      Schwarz, U. D.
      Date
      2016
      Source Title
      Applied Physics Letters
      Print ISSN
      0003-6951
      Publisher
      American Institute of Physics Inc.
      Volume
      108
      Issue
      7
      Language
      English
      Type
      Article
      Item Usage Stats
      126
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      Abstract
      The extent to which point defects affect the local chemical reactivity and electronic properties of an oxide surface was evaluated with picometer resolution in all three spatial dimensions using simultaneous atomic force/scanning tunneling microscopy measurements performed on the (110) face of rutile TiO2. Oxygen atoms were imaged as protrusions in both data channels, corresponding to a rarely observed imaging mode for this prototypical metal oxide surface. Three-dimensional spectroscopy of interaction forces and tunneling currents was performed on individual surface and subsurface defects as a function of tip-sample distance. An interstitial defect assigned to a subsurface hydrogen atom is found to have a distinct effect on the local density of electronic states on the surface, but no detectable influence on the tip-sample interaction force. Meanwhile, spectroscopic data acquired on an oxygen vacancy highlight the role of the probe tip in chemical reactivity measurements.
      Keywords
      Atoms
      Defect density
      Electron tunneling
      Electronic properties
      Metals
      Oxide minerals
      Oxygen vacancies
      Point defects
      Titanium dioxide
      Interstitial defects
      Local density of electronic state
      Picometer resolution
      Prototypical metal oxide surfaces
      Reactivity measurements
      Subsurface hydrogens
      Three-dimensional interaction
      Tip-sample interaction
      Surface defects
      Permalink
      http://hdl.handle.net/11693/36660
      Published Version (Please cite this version)
      https://doi.org/10.1063/1.4942100
      Collections
      • Department of Mechanical Engineering 288
      • Institute of Materials Science and Nanotechnology (UNAM) 1930
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