Abstract
Tungsten oxide nanoclusters were prepared by evaporation of tungsten oxide powder from a specially designed evaporation cell under ultra high vacuum (UHV) conditions. The ( 0 0 0 1 ) , ( 2 ¯ 1 1 0 ) and ( 1 ¯ 1 0 2 ) α-Al 2O 3 single-crystal substrate surface orientations were used as substrates. The structure and epitaxial parameters of tungsten oxide nanoclusters were determined by reflection high-energy electron diffraction (RHEED). Structural properties of tungsten oxide deposits were found to be dependent on the substrate surface orientation and deposition conditions. Well-oriented populations of WO 2 nanoclusters were observed. They exhibited preferentially ( 1 0 1 ¯ ) WO 2 epitaxial planes.
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