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The two-and three-chamber, linear, high voltage (200-300 V) and limited current (120-280 A) plasma generators (PGs) have been designed and manufactured by us for application in surface engineering. The operating and thermal characteristics (TC) of PGs, along with the distribution of w local plasma flow velocity (m s −1 ) w f plasma jet mean velocity (m s −1 ) ρ gas density (kg m −3 ) η PG efficiency σ electrical conductivity ( −1 m −1 )

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Herein, photothermal modification of nanocomposite films consisting of hydrated vanadium pentoxide (V 2 O 5 · n H 2 O) nanoribbons wrapped with graphene oxide (GO) flakes was performed via 405 nm direct laser irradiation. The combination of X-ray diffraction, X-ray photoelectron spectroscopy, Raman scattering, transmission electron microscopy, and scanning electron microscopy allowed comprehensive characterization of physical and chemical changes of GO/V 2 O 5 · n H 2 O nanocomposite films upon photothermal modification. The modified nanocomposite films exhibited porous surface morphology (17.27 m 2 g –1 ) consisting of randomly distributed pillarlike protrusions. The photothermal modification process of GO/V 2 O 5 · n H 2 O enhanced the electrical conductivity of nanocomposite from 1.6 to 6.8 S/m. It was also determined that the direct laser irradiation of GO/V 2 O 5 · n H 2 O resulted in considerable decrease of C–O bounds as well as O–H functional groups with an increase of the laser power density.

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