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Terawatt laser system irradiation of carbon/tungsten bilayers
Author(s) -
Lungu C. P.,
Marcu A.,
Porosnicu C.,
Jepu I.,
Lungu A. M.,
Chiru P.,
Luculescu C.,
Banici R.,
Ursescu D.,
Dabu R.,
Feraru I. D.,
Grigorescu C. E. A.,
Iacobescu G.,
Osiac M.,
Kovač J.,
Nemanič V.,
Hinkov I.,
Farhat S.,
Gicquel A.,
Brinza O.
Publication year - 2012
Publication title -
physica status solidi (a)
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.532
H-Index - 104
eISSN - 1862-6319
pISSN - 1862-6300
DOI - 10.1002/pssa.201200046
Subject(s) - materials science , tungsten , irradiation , raman spectroscopy , selected area diffraction , scanning electron microscope , laser , diamond , raman scattering , analytical chemistry (journal) , carbon fibers , graphite , fluence , x ray photoelectron spectroscopy , diffraction , optics , transmission electron microscopy , nanotechnology , chemistry , composite material , chemical engineering , metallurgy , composite number , physics , engineering , chromatography , nuclear physics
Using the original thermionic vacuum arc method (TVA), carbon films with the thickness of about 2500 nm were coated on top of 200 nm tungsten films deposited on fine grain graphite substrates. The carbon/tungsten bilayers were irradiated using a terawatt laser system (TEWALAS), 360 ps and 100 fs pulse duration, 110–150 mJ pulse energy. The analysis of the selected area electron diffraction (SAED) pattern allowed the identification of rhomboedral structures corresponding to diamond. The Raman scattering measurements were also performed on the produced craters and the specific peak at 1330 cm −1 corresponding to diamond was observed. The CC sp 3 bonding content increased to 39.4% in the irradiated region compared to 30.8% in the “as deposited” zone, as shown by XPS. The craters produced by the laser irradiation were morphologically studied using optical imaging and scanning electron microscopy.