Well-ordered molybdenum oxide layers on Au(111): Preparation and properties

TitleWell-ordered molybdenum oxide layers on Au(111): Preparation and properties
Publication TypeJournal Article
Year of Publication2013
AuthorsS. Guimond, D. Gobke, J.M Sturm, Y. Romanyshyn, H. Kuhlenbeck, M. Cavalleri, H.J Freund
JournalJournal of Physical Chemistry C
Volume117
Number17
Pagination8746-8757
Abstract

MoO3 layers on Au(111) were prepared via oxidation of molybdenum at elevated temperature in an atmosphere of 50 mbar of O2. Three different types of oxide structures were identified. Up to monolayer oxide coverage a structure with a c(4 × 2) unit cell relative to the Au(111) unit cell forms. This structure was previously identified as being similar to a monolayer of α-MoO3.(1) At larger coverages of up to two layers an oxide with a 11.6 Å × 5 Å rectangular unit cell appears. Further increase in the coverage leads to the occurrence of crystallites of regular α-MoO3 with a very small density of defects. These crystallites grow with the (010) plane parallel to the substrate surface and with random azimuthal orientation leading to rings in the LEED pattern. With increasing layer thickness the crystallites start to coalesce until finally a closed film forms. These layers sublimate at temperatures between about 670 and 770 K with the MoO3 aggregates sublimating at lower temperature than the bilayer and monolayer films. © 2013 American Chemical Society.

URLhttp://w0.rz-berlin.mpg.de/hjfdb/pdf/640e.pdf
DOI10.1021/jp3113792
Division

nSI

Department

EUV-Lab

PID

ecd956aa02e4d7aa0cc1df02892dd0e0

Alternate TitleJ. Phys. Chem. C
LabelOA

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