The influence of the gas environment on morphology and chemical composition of surfaces micro-machined with a femtosecond laser

Lehr, Jorge, de Marchi, Fabrizio, Matus, Luke, MacLeod, Jennifer, Rosei, Federico, & Kietzig, Anne-Marie (2014) The influence of the gas environment on morphology and chemical composition of surfaces micro-machined with a femtosecond laser. Applied Surface Science, 320, pp. 455-465.

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We investigated the influence of different gas environments on the fabrication of surfaces, homogeneously covered with equally sized and spaced micro-structures. Two types of structures have been successfully micro-machined with a femtosecond laser on titanium surfaces in various atmospheres. The surface chemistry of samples machined in oxygen and helium shows TiO2, while machining in nitrogen leads to an additional share of TiN. The actual surface structure was found to vary significantly as a function of the gas environment. We found that the ablated particles and their surface triggered two consecutive events: The optical properties of the gas environment became non-isotropic which then led to the pulse intensity being redistributed throughout the cross section of the laser beam. Additionally, the effective intensity was further reduced for TiN surfaces due to TiN's high reflectivity. Thus, the settings for the applied raster-scanning machining method had to be adjusted for each gas environment to produce comparable structures. In contrast to previous studies, where only noble gases were found suitable to produce homogeneous patches, we obtained them in an oxygen environment.

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4 citations in Web of Science®

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ID Code: 89972
Item Type: Journal Article
Refereed: Yes
Keywords: Micro-machining; Femtosecond laser; Titanium; Machining environment; Surface chemistry; Effective intensity
DOI: 10.1016/j.apsusc.2014.09.011
ISSN: 0169-4332
Divisions: Current > Schools > School of Chemistry, Physics & Mechanical Engineering
Current > QUT Faculties and Divisions > Science & Engineering Faculty
Copyright Owner: Copyright 2014 Elsevier B.V.
Deposited On: 07 Apr 2016 01:37
Last Modified: 14 Apr 2016 03:34

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