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Open AccessArticle

Hierarchical Micro-/Nano-Structures on Polycarbonate via UV Pulsed Laser Processing

1
Department of Mechanics of Solids, Surfaces and Systems (MS3), Faculty of Engineering Technology, University of Twente, Drienerlolaan 5, 7522 NB Enschede, The Netherlands
2
Fraunhofer Institut für Werkstoff- und Strahltechnik (IWS), Winterbergstraße 28, 01277 Dresden, Germany
3
Optical Science Group, MESA + Institute for Nanotechnology, University of Twente, Drienerlolaan 5, 7500 AE Enschede, The Netherlands
4
Bundesanstalt für Materialforschung und -prüfung (BAM), Unter den Eichen 87, 12205 Berlin, Germany
5
Institut für Fertigungstechnik, Technische Universität Dresden, Georg-Bähr-Str. 3c, 01069 Dresden, Germany
*
Author to whom correspondence should be addressed.
Nanomaterials 2020, 10(6), 1184; https://doi.org/10.3390/nano10061184
Received: 15 May 2020 / Revised: 29 May 2020 / Accepted: 2 June 2020 / Published: 17 June 2020
(This article belongs to the Special Issue Laser-Generated Periodic Nanostructures)
Hierarchical micro/-nanostructures were produced on polycarbonate polymer surfaces by employing a two-step UV-laser processing strategy based on the combination of Direct Laser Interference Patterning (DLIP) of gratings and pillars on the microscale (3 ns, 266 nm, 2 kHz) and subsequently superimposing Laser-induced Periodic Surface Structures (LIPSS; 7–10 ps, 350 nm, 100 kHz) which adds nanoscale surface features. Particular emphasis was laid on the influence of the direction of the laser beam polarization on the morphology of resulting hierarchical surfaces. Scanning electron and atomic force microscopy methods were used for the characterization of the hybrid surface structures. Finite-difference time-domain (FDTD) calculations of the laser intensity distribution on the DLIP structures allowed to address the specific polarization dependence of the LIPSS formation observed in the second processing step. Complementary chemical analyzes by micro-Raman spectroscopy and attenuated total reflection Fourier-transform infrared spectroscopy provided in-depth information on the chemical and structural material modifications and material degradation imposed by the laser processing. It was found that when the linear laser polarization was set perpendicular to the DLIP ridges, LIPSS could be formed on top of various DLIP structures. FDTD calculations showed enhanced optical intensity at the topographic maxima, which can explain the dependency of the morphology of LIPSS on the polarization with respect to the orientation of the DLIP structures. It was also found that the degradation of the polymer was enhanced for increasing accumulated fluence levels. View Full-Text
Keywords: Direct Laser Interference Patterning; Laser-induced Periodic Surface Structures; polycarbonate; hierarchical structures; surface functionalization Direct Laser Interference Patterning; Laser-induced Periodic Surface Structures; polycarbonate; hierarchical structures; surface functionalization
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MDPI and ACS Style

Mezera, M.; Alamri, S.; Hendriks, W.A.; Hertwig, A.; Elert, A.M.; Bonse, J.; Kunze, T.; Lasagni, A.F.; Römer, G.-W.R. Hierarchical Micro-/Nano-Structures on Polycarbonate via UV Pulsed Laser Processing. Nanomaterials 2020, 10, 1184.

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