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- Title
The nano-fractal structured tungsten oxides films with high thermal stability prepared by the deposition of size-selected W clusters.
- Authors
Park, Eun; Dollinger, Andreas; Huether, Lukas; Blankenhorn, Moritz; Koehler, Kerstine; Seo, Hyun; Kim, Young; Gantefoer, Gerd
- Abstract
Size-selected W clusters ( n = 1650) were deposited on the highly ordered pyrolytic graphite surface at room temperature under high vacuum conditions by utilizing a magnetron sputtering source and a magnet sector field. Moreover, geometrical structure and surface chemical states of deposited clusters were analyzed by in situ scanning tunneling microscopy (STM) and X-ray photoelectron spectroscopy, respectively. The formation of 2-D islands (lateral size ~150 nm) with multiple dendritic arms was observed by STM, and the structure of the individual W clusters survived within the dendritic arms. To study the thermal stability of the nano-fractal structure under the atmospheric conditions, the sample was brought to the ambient air conditions and sequentially post-annealed at 200, 300, and 500 °C in the air. The nano-fractal structure was maintained after the 1st post-annealing process at 200 °C for 1 h in the air, and the subsequent 2nd post-annealing at 300 °C (for 1 h, in the air) also did not induce any noticeable change in the topological structure of the sample. The topological changes were observed only after the further post-annealing at a higher temperature (at 500 °C, 1 h) in the air. We show high potential use of these nano-structured films of tungsten oxides in ambient conditions.
- Subjects
TUNGSTEN films; OXIDE coating; PYROLYTIC graphite; MAGNETRON sputtering; THERMAL stability; SCANNING tunneling microscopy
- Publication
Applied Physics A: Materials Science & Processing, 2017, Vol 123, Issue 6, p1
- ISSN
0947-8396
- Publication type
Article
- DOI
10.1007/s00339-017-1037-8