Surface analysis of ripple pattern on PS and PEN induced with ring‐shaped mask due to KrF laser treatment

Abstract

The approach for ripple nanopattern construction on surface of two polymer substrates [polyethylene naphthalate (PEN) and polystyrene (PS)] exposed by a KrF pulse excimer UV laser through a contact lithographic mask with circular slit was proposed in this paper. Thin layer of gold was deposited on samples after the laser treatment. Changes in the morphology of the surface of both the shielded and exposed areas of the substrates, as well as the dimensions of the laser‐induced periodic surface structures, were determined (by atomic force microscopy, laser confocal microscopy and scanning electron microscopy), compared with observations and measurements made on samples treated directly (without a contact mask) under the same conditions. The morphology of the interface between the treated and untreated regions was also closely studied. Surface chemistry of treated samples was studied in detail by X‐ray Photoelectron Spectroscopy. The detailed study of surface chemistry of modified PEN and PS revealed a significant increase of oxygen concentration for laser treated PS and increase of carboxyl groups in case of PEN. The potential application of this research can be found in biotechnology, micro technology and several other fields. Copyright © 2016 John Wiley & Sons, Ltd.

Surface Modification of Polymer Substrates for Biomedical Applications

“…On some polymers, other structures have been observed as well. On PS for example, under certain treatment conditions, the formation of ripples is preceded by the formation of globular structures, which are formed at values of laser fluence insufficient for the formation of fully developed ripples, into which they eventually fuse once the fluence is increased into the ripple-inducing range [29]. The dimensions of these ripples are generally dependent on both the characteristics of the polymer substrate and the conditions of the laser treatment.…”

Antibacterial Properties of Plasma-Activated Perfluorinated Substrates with Silver Nanoclusters Deposition

“…Another polymer which has recently received more attention is polyvinylidene fluoride (PVDF). PVDF is a membrane material having excellent properties of high mechanical strength, thermal stability, chemical resistance, and high hydrophobicity when compared to other commercially available polymeric materials, such as polyethylene naphthalate (PEN), polystyrene (PS), polyethylene (PE), or polyethylene terephthalate (PET) [ 24 , 25 , 26 ]. PVDF membranes have been widely applied in ultrafiltration and microfiltration processes for general separation purposes and are currently being investigated as potential candidates for use in membrane distillation and membrane contractors [ 27 ].…”

Straightforward Patterning of Functional Polymers by Sequential Nanosecond Pulsed Laser Irradiation

“…During a typical process for the generation of gratings obtained by repeated nanosecond pulsed laser irradiation, the polarization direction of the laser is kept constant and the fluence and number of pulses are optimized for each material [ 30 , 53 , 61 ]. However, in our approach, a selected set of pulses is applied with a different polarization state using a half-wave plate, imposing a new geometry to the pre-existing grating-like one.…”

“…Additionally, the combination of different laser techniques, such as direct laser writing and DLIP [ 49 ] or DLIP with mask imaging [ 50 ], may induce the formation of more complex structures, and also multi-pulse DLIP [ 51 ], laser micropatterning followed by LIPSS formation [ 52 ] or LIPSS simultaneously with diffraction patterns have been reported [ 53 ].…”