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RESEARCH PRODUCT
Laser irradiation of carbon–tungsten materials
Gunta KizaneCorneliu PorosnicuA. MarinP. OsiceanuC. P. LunguL. AvotinaC.e.a. GrigorescuNicola DemitriA. MarcuDaniel UrsescuC. Grigoriusubject
Materials scienceAcoustics and UltrasonicsScanning electron microscopeAnalytical chemistrychemistry.chemical_elementVacuum arcTungstenCondensed Matter PhysicsLaserSurfaces Coatings and FilmsElectronic Optical and Magnetic Materialslaw.inventionCarbideX-ray photoelectron spectroscopychemistrylawFemtosecondIrradiationdescription
Carbon–tungsten layers deposited on graphite by thermionic vacuum arc (TVA) were directly irradiated with a femtosecond terawatt laser. The morphological and structural changes produced in the irradiated area by different numbers of pulses were systematically explored, both along the spots and in their depths. Although micro-Raman and Synchrotron-x-ray diffraction investigations have shown no carbide formation, they have shown the unexpected presence of embedded nano-diamonds in the areas irradiated with high fluencies. Scanning electron microscopy images show a cumulative effect of the laser pulses on the morphology through the ablation process. The micro-Raman spatial mapping signalled an increased percentage of sp3 carbon bonding in the areas irradiated with laser fluencies around the ablation threshold. In-depth x-ray photoelectron spectroscopy investigations suggested a weak cumulative effect on the percentage increase of the sp2-sp3 transitions with the number of laser pulses just for nanometric layer thicknesses.
| year | journal | country | edition | language |
|---|---|---|---|---|
| 2014-08-13 | Journal of Physics D: Applied Physics |