<div class="csl-bib-body">
<div class="csl-entry">Lasemi, N., Liedl, G., & Rupprechter, G. (2022, October 25). <i>Multi-pulse femtosecond laser ablation of Au-coated Ni foil in various fluids: A way to produce hierarchical periodic surface structures and nanomaterials</i> [Keynote Presentation]. Functional Materials 2022, Bratislava, Slovakia.</div>
</div>
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dc.identifier.uri
http://hdl.handle.net/20.500.12708/152765
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dc.description.abstract
Femtosecond laser ablation in liquids can be used for surface engineering to generate laser-induced periodic surface structures (LIPSS) or for nanomaterial production. Both have a variety of applications in optics, electronics, catalysis and medicine. In fact, LIPSS is the preliminary process to generate nanoparticles. That´s why several monomodal and multimodal nanoparticles were detected while they were embedded or trapped on nanoripples. After applying several consecutive fs pulses on metals, the absorption of laser energy by surface electrons leads to the formation of hot and excited electron gas while the lattice system stays cold, as explained by the two-temperature model. Since the fs pulses are shorter than the electron-lattice relaxation time (10−10 to 10−12 s), a surface goes through a reorganization followed by hydrodynamic instabilities, phase transformations and formation of self-organized micro/nanostructures. However, the expected results can be affected by the ablation environment, thus the nature of the fluid plays an important role for the morphology of the laser-treated areas, type/frequency/orientation of hierarchical features, the composition of the ripples/crates/nanoparticles, crater width/depth/volume and specific ablation rate. For analyses of either LIPSS or craters, the highest resulting microstrain was measured for butanol. Also, LIPSS on butanol went through lattice deformation and increased cell volume. For NiAu nanoparticles, a lowest Stokes radius was observed in butanol. This can result from the formation of a thin graphite shell around the nanoparticles which prevents particles from further diffusion. Moreover, an imperfect graphite layer was detected by confocal Raman spectroscopy on LIPSS areas for butanol.
en
dc.language.iso
en
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dc.subject
femtosecond laser processing
en
dc.subject
Laser ablation in liquid
en
dc.subject
Surface Engineering
en
dc.subject
Laser induced periodic surface structures
en
dc.subject
Graphitization
en
dc.title
Multi-pulse femtosecond laser ablation of Au-coated Ni foil in various fluids: A way to produce hierarchical periodic surface structures and nanomaterials
en
dc.type
Presentation
en
dc.type
Vortrag
de
dc.type.category
Keynote Presentation
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tuw.publication.invited
invited
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tuw.researchTopic.id
M2
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tuw.researchTopic.id
Q1
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tuw.researchTopic.id
M1
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tuw.researchTopic.name
Materials Characterization
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tuw.researchTopic.name
Photonics
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tuw.researchTopic.name
Surfaces and Interfaces
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tuw.researchTopic.value
30
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tuw.researchTopic.value
33
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tuw.researchTopic.value
37
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tuw.publication.orgunit
E165 - Institut für Materialchemie
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tuw.publication.orgunit
E311 - Institut für Fertigungstechnik und Photonische Technologien
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tuw.event.name
Functional Materials 2022
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tuw.event.startdate
25-10-2022
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tuw.event.enddate
25-10-2022
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tuw.event.online
On Site
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tuw.event.type
Event for scientific audience
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tuw.event.place
Bratislava
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tuw.event.country
SK
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tuw.event.institution
Institute of Materials and Machine Mechanics, Slovak Academy of Sciences
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tuw.event.presenter
Lasemi, Niusha
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wb.sciencebranch
Chemie
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wb.sciencebranch
Nanotechnologie
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wb.sciencebranch
Physik, Astronomie
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wb.sciencebranch.oefos
1040
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wb.sciencebranch.oefos
2100
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wb.sciencebranch.oefos
1030
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wb.sciencebranch.value
50
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wb.sciencebranch.value
30
-
wb.sciencebranch.value
20
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item.openairetype
Presentation
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item.openairetype
Vortrag
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item.grantfulltext
none
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item.cerifentitytype
Publications
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item.cerifentitytype
Publications
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item.languageiso639-1
en
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item.openairecristype
http://purl.org/coar/resource_type/c_18cf
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item.openairecristype
http://purl.org/coar/resource_type/c_18cf
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item.fulltext
no Fulltext
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crisitem.author.dept
E165-01-1 - Forschungsgruppe Modellkatalyse und angewandte Katalyse