Nanocomposite tantalum–carbon-based films deposited by femtosecond pulsed laser ablation |
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| Affiliation: | 1. Laboratoire Traitement du Signal et Instrumentation, UMR 5516, Université J. Monnet, 10 rue Barrouin, 42000 Saint-Etienne, France;2. Ecole Nationale Supérieure des Mines de Saint-Etienne, Centre SMS - URA CNRS 5146, 158 cours Fauriel, 42023 Saint-Etienne, Cedex 02, France;3. Laboratoire de Géologie de l''Ecole Normale Supérieure de Paris 24, rue Lhomond 75231-Paris Cedex 5, France;4. Laboratoire de Physique du Solide, UPR5 CNRS-ESPCI, 10 rue Vauquelin 75231-Paris Cedex 05, France;1. Theoretical Division, NRC Kurchatov Institute, 123182 Moscow, Russia;2. Moscow Institute of Physics and Technology, 141700 Dolgoprudnyi, Russia;1. Lviv Polytechniс National University, S. Bandera Str., 12, Lviv 79013, Ukraine;2. International Laboratory of High Magnetic Fields and Low Temperatures, Wroclaw, Poland;3. Institute of Nuclear Researches, NAS of Ukraine, 47, Prospect Nauky, 03028 Kyiv, Ukraine;4. Ivan Franko Drohobych State Pedagogical University, 24, Franko str., 82100 Drohobych, Ukraine;1. Department of Physics, Faculty of Sciences and Letters, Çukurova University, 01330 Adana, Turkey;2. Department of Material Science and Engineering, Faculty of Engineering, Hakkari University, 30000 Hakkari, Turkey;3. ICMA (CSIC-Universidad de Zaragoza), María de Luna, 3, 50018 Zaragoza, Spain;1. Laboratório de Simulação, Departamento de Física, ICEx Universidade Federal de Minas Gerais, 31720-901 Belo Horizonte, Minas Gerais, Brazil;2. Departamento de Física, ICEB, Universidade Federal de Ouro Preto, 35400-000 Ouro Preto, Minas Gerais, Brazil |
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| Abstract: | Nanostructured coatings of metal (tantalum) containing diamond-like carbon (a-C:Ta) have been prepared by femtosecond pulsed laser deposition (PLD). The films, containing 15 at.% tantalum, have been deposited by ablating sequentially graphite and metallic tantalum in vacuum conditions with an amplified Ti:sapphire laser. The coatings have been investigated by X-ray photoelectron spectroscopy, grazing angle X-ray diffraction, energy filtered transmission electron microscopy, scanning and high resolution transmission electron microscopies. Evidence of metallic α-Ta and β-Ta particles (diameter in the 100 nm range) and smaller quasi-amorphous tantalum clusters embedded in the carbonaceous matrix have been shown. A thin tantalum carbide interface between the carbon matrix and the top surface of the tantalum nodules has also been identified. The ability of femtosecond pulsed laser deposition to synthetize nanocomposite carbon-based films and to control their nanostructure is discussed. |
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