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- Mwabora, Julius M., et al.
(författare)
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Structure, Composition and Morphology of Photoelectrochemically Active TiO2-xNx Thin Films Deposited by Reactive DC Magnetron Sputtering
- 2004
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Ingår i: Journal of Physical Chemistry B. - : American Chemical Society (ACS). - 1520-6106 .- 1520-5207. ; 108:52, s. 20193-20198
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Tidskriftsartikel (refereegranskat)abstract
- Films of nitrogen-doped TiO2 were made by reactive DC magnetron sputtering in a mixture of argon, oxygen, and nitrogen. The nitrogen gas ratio Φ was varied in the 0 < Φ < 0.025 range during the depositions, resulting in TiO2-xNx films with 0 ≤ x ≤ 0.022 as determined by X-ray photoelectron spectroscopy. Structural and morphological properties of the films were investigated by X-ray diffraction, atomic force microscopy, and scanning and transmission electron microscopy. Films prepared without nitrogen had a rutile structure, while the nitrogen-doped films were either rutile or anatase depending on Φ being below or above ∼0.007. Deposition rate, effective grain size, root-mean-square roughness, morphology, and optical absorption were also found to depend on Φ. The films were photoelectrochemically active, as reported in an earlier papers of ours [J. Phys. Chem. B 2003, 107, 5709-5716 and J. Phys. Chem. B 2004, 108, 5995-6003].
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- Zocco, A., et al.
(författare)
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Mechanical and tribological properties of CNx films deposited by reactive pulsed laser ablation
- 2002
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Ingår i: Diamond and related materials. - 0925-9635 .- 1879-0062. ; 11:1, s. 98-104
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Tidskriftsartikel (refereegranskat)abstract
- We report the tribological, mechanical, structural and compositional characteristics of CNx films deposited by excimer laser (XeCl, ? = 308 nm, TFWHM = 30 ns) ablation of a graphite target in N2 atmosphere. The influence of growth conditions on structural, morphological, tribological and mechanical properties of the CNx films has been examined by X-ray Photoelectron Spectroscopy (XPS), Transmission and Scanning Electron Microscopy (TEM and SEM, respectively), nanoindentation measurements and ball-on-disk tests. All the as-deposited films have a microstructure consisting of nanometer-sized graphitic clusters in an amorphous matrix. The stresses of the films are tensile or compressive depending on the deposition conditions. Friction coefficients of the films, deduced by high speed steel balls, increase with laser fluence and nitrogen pressure from 0.12 to 0.14. Friction is thus, lower than what has been reported in literature for CNx films. © 2002 Elsevier Science B.V. All rights reserved.
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