Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
9567119 | Applied Surface Science | 2005 | 6 Pages |
Abstract
Tungsten oxide nanoparticles were generated by excimer (ArF) laser assisted chemical vapor deposition from WF6/H2/O2/Ar gas mixtures. The deposited particles were characterized by X-ray diffraction, X-ray photoelectron spectroscopy, and transmission electron microscopy. The deposition rate as a function of the partial pressures of the reactants and of the laser fluence was measured by X-ray fluorescence spectroscopy. The mean diameter of the deposited tungsten oxide particles varied with the experimental parameters and was typically 23Â nm. Particles with a higher degree of crystallinity were observed at a laser fluence exceeding 130Â mJ/cm2, and X-ray amorphous particles were obtained below 110Â mJ/cm2. The amorphous tungsten oxide had a stoichiometry ranging from WO2.7 to WO3. Deposits were formed only when hydrogen was present in the gas mixture.
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Authors
O. Alm, L. Landström, M. Boman, C.G. Granqvist, P. Heszler,