Journal
APPLIED SURFACE SCIENCE
Volume 390, Issue -, Pages 236-243Publisher
ELSEVIER
DOI: 10.1016/j.apsusc.2016.08.029
Keywords
Diamond-like-carbon; Laser induced periodic surface structures; Pulsed laser deposition; Picosecond laser irradiation
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Funding
- National Authority for Research and Innovation in the frame of Nucleus program [4N/2016]
- Romanian National Authority for Scientific Research [PNII-RU-TE-2012-3-0379, TE16/2013]
- [PN 16 47 - LAPLAS IV]
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Thin films of carbon were synthesized by ns pulsed laser deposition in vacuum on silicon substrates, starting from graphite targets. Further on, the films were irradiated with a picosecond laser source emitting in visible at 532 nm. After tuning of laser parameters, we obtained a film surface covered by laser induced periodical surface structures (LIPSS). They were investigated by optical, scanning electron and atomic force microscopy. It was observed that changing the irradiation angle influences the LIPSS covered area. At high magnification it was revealed that the LIPSS pattern was quite complex, being composed of other small LIPSS islands, interconnected by bridges of nanoparticles. Raman spectra for the non-irradiated carbon films were typical for a-C type of diamond-like carbon, while the LIPSS spectra were characteristic to nano-graphite. The pristine carbon film was hydrophilic, while the LIPSS covered film surface was hydrophobic. (C) 2016 Elsevier B.V. All rights reserved.
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