2023
DOI: 10.1002/pssa.202300719
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Chemical and Topographical Changes upon Sub‐100‐nm Laser‐Induced Periodic Surface Structure Formation on Titanium Alloy: The Influence of Laser Pulse Repetition Rate and Number of Over‐Scans

Kai Müller,
Francesca Mirabella,
Xenia Knigge
et al.

Abstract: Titanium and its alloys are known to allow the straightforward laser‐based manufacturing of ordered surface nanostructures, so‐called high spatial frequency laser‐induced periodic surface structures (HSFL). These structures exhibit sub‐100 nm spatial periods – far below the optical diffraction limit. However, the resulting surface functionalities are usually enabled by both, topographic and chemical alterations of the nanostructured surfaces. For exploring these effects, multi‐method characterizations were per… Show more

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“…Moreover, the results presented here for the XPS and HAXPES analyses of the ps‐laser‐generated spikes morphology are generally very similar to the ones recently reported for ps‐laser‐generated high spatial frequency LIPSS, so‐called HSFL (type II) on Ti–6Al–4V alloy. [ 33 ] Such nanostructures are formed slightly above the lowest threshold fluence of permanent material modification and represent a grating‐like surface topography with sub‐100 nm spatial periods and modulation depths of some tens of nanometers only. Given this similarity in the XPS and HAXPES results between the ps‐laser‐generated HSFL and spikes, it must be concluded that the ps‐laser treatment of the Ti alloy in air environment at fluences exceeding the modification threshold of the material is accompanied by surface oxidation toward the formation of amorphous TiO 2 layers at the sample interface.…”
Section: Resultsmentioning
confidence: 99%
“…Moreover, the results presented here for the XPS and HAXPES analyses of the ps‐laser‐generated spikes morphology are generally very similar to the ones recently reported for ps‐laser‐generated high spatial frequency LIPSS, so‐called HSFL (type II) on Ti–6Al–4V alloy. [ 33 ] Such nanostructures are formed slightly above the lowest threshold fluence of permanent material modification and represent a grating‐like surface topography with sub‐100 nm spatial periods and modulation depths of some tens of nanometers only. Given this similarity in the XPS and HAXPES results between the ps‐laser‐generated HSFL and spikes, it must be concluded that the ps‐laser treatment of the Ti alloy in air environment at fluences exceeding the modification threshold of the material is accompanied by surface oxidation toward the formation of amorphous TiO 2 layers at the sample interface.…”
Section: Resultsmentioning
confidence: 99%