Three-dimensional interaction force and tunneling current spectroscopy of point defects on rutile TiO2(110)
Date
2016Source Title
Applied Physics Letters
Print ISSN
0003-6951
Publisher
American Institute of Physics Inc.
Volume
108
Issue
7
Language
English
Type
ArticleItem Usage Stats
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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
AtomsDefect 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/11693/36660Published Version (Please cite this version)
https://doi.org/10.1063/1.4942100Collections
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