Scanning tunneling microscopy and tunneling spectroscopy of the n-TiO sub 2 (001) surface

Journal Article · Thu May 03 00:00:00 EDT 1990 · Journal of Physical Chemistry; (USA)

DOI:https://doi.org/10.1021/j100372a075· OSTI ID:6336135

Fan, F F; Bard, A J ^[1]

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1. Univ. of Texas, Austin (USA)

The (001) surface of a highly doped ({approximately} 10{sup 19} cm{sup {minus}3}) n-type TiO{sub 2} crystal, following polishing, wet etching, and cleaning, was imaged in air with a Pt-Ir tip with a scanning tunneling microscope (STM). Good images of the surface could be obtained with the sample held at negative voltage (positive tip bias), with the high-resolution image showing only Ti atoms. Tunneling spectroscopy, involving the recording of i-V curves and dynamic conductance (di/dV)-V curves with the tip held over a given spot on the TiO{sub 2} surface, was also carried out. The resulting curves show electron tunneling into the conduction band and from the valence band, as well as a prominent peak identified as a surface state about 0.3 eV below the conduction band edge.

• OSTI ID: 6336135
• Journal Information: Journal of Physical Chemistry; (USA), Vol. 94:9; ISSN 0022-3654
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
TITANIUM OXIDES
SPECTROSCOPY
SURFACE PROPERTIES
DATA ANALYSIS
DOPED MATERIALS
EXPERIMENTAL DATA
MEASURING INSTRUMENTS
MEASURING METHODS
CHALCOGENIDES
DATA
INFORMATION
MATERIALS
NUMERICAL DATA
OXIDES
OXYGEN COMPOUNDS
TITANIUM COMPOUNDS
TRANSITION ELEMENT COMPOUNDS
360202* - Ceramics
Cermets
& Refractories- Structure & Phase Studies