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Large-area homogeneous periodic surface structures generated on the surface sputtered boron carbide thin films by femtosecond laser processing

2015-03-15Journal article Restricted access
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dc.contributor.authorSerra, R.
dc.contributor.authorOliveira, Vitor
dc.contributor.authorOliveira, J. C.
dc.contributor.authorKubart, T.
dc.contributor.authorVilar, R.
dc.contributor.authorCavaleiro, A.
dc.date.accessioned2016-03-17T17:08:03Z
dc.date.available2016-03-17T17:08:03Z
dc.date.issued2015-03-15
dc.description.abstractAmorphous and crystalline sputtered boron carbide thin films have a very high hardness even surpassing that of bulk crystalline boron carbide (≈41 GPa). However, magnetron sputtered B-C films have high friction coefficients (C.o.F) which limit their industrial application. Nanopatterning of materials surfaces has been proposed as a solution to decrease the C.o.F. The contact area of the nanopatterned surfaces is decreased due to the nanometre size of the asperities which results in a significant reduction of adhesion and friction. In the present work, the surface of amorphous and polycrystalline B-C thin films deposited by magnetron sputtering was nanopatterned using infrared femtosecond laser radiation. Successive parallel laser tracks 10 μm apart were overlapped in order to obtain a processed area of about 3 mm2. Sinusoidal-like undulations with the same spatial period as the laser tracks were formed on the surface of the amorphous boron carbide films after laser processing. The undulations amplitude increases with increasing laser fluence. The formation of undulations with a 10 μm period was also observed on the surface of the crystalline boron carbide film processed with a pulse energy of 72 μJ. The amplitude of the undulations is about 10 times higher than in the amorphous films processed at the same pulse energy due to the higher roughness of the films and consequent increase in laser radiation absorption. LIPSS formation on the surface of the films was achieved for the three B-C films under study. However, LIPSS are formed under different circumstances. Processing of the amorphous films at low fluence (72 μJ) results in LIPSS formation only on localized spots on the film surface. LIPSS formation was also observed on the top of the undulations formed after laser processing with 78 μJ of the amorphous film deposited at 800 °C. Finally, large-area homogeneous LIPSS coverage of the boron carbide crystalline films surface was achieved within a large range of laser fluences although holes are also formed at higher laser fluences.pt_PT
dc.identifier.citationSERRA, R.; [et al.] - Large-area homogeneous periodic surface structures generated on the surface sputtered boron carbide thin films by femtosecond laser processing. Applied Surface Science. ISSN. 0169-4332. Vol. 331 (2015), pp. 161-169pt_PT
dc.identifier.doi10.1016/j.apsusc.2015.01.060pt_PT
dc.identifier.issn0169-4332
dc.identifier.issn1873-5584
dc.identifier.urihttp://hdl.handle.net/10400.21/5903
dc.language.isoengpt_PT
dc.peerreviewedyespt_PT
dc.publisherELSEVIER SCIENCE BVpt_PT
dc.relation.publisherversionhttp://www.sciencedirect.com/science/article/pii/S0169433215000847pt_PT
dc.subjectSurface nanostructuringpt_PT
dc.subjectBoron carbidept_PT
dc.subjectSputteringpt_PT
dc.subjectFemtosecond laserpt_PT
dc.subjectLIPSSpt_PT
dc.titleLarge-area homogeneous periodic surface structures generated on the surface sputtered boron carbide thin films by femtosecond laser processingpt_PT
dc.typejournal article
dspace.entity.typePublication
oaire.citation.endPage169pt_PT
oaire.citation.startPage161pt_PT
oaire.citation.volume331pt_PT
person.familyNameOliveira
person.givenNameVitor
person.identifier.ciencia-idDA1C-25BD-5974
person.identifier.orcid0000-0002-1757-4524
person.identifier.ridA-3058-2009
person.identifier.scopus-author-id7006105706
rcaap.rightsclosedAccesspt_PT
rcaap.typearticlept_PT
relation.isAuthorOfPublication269ff9af-427f-4d1d-949c-cd77cd386e9f
relation.isAuthorOfPublication.latestForDiscovery269ff9af-427f-4d1d-949c-cd77cd386e9f

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