The existence of sub-micrometer micromechanical modulation generated by polarized UV laser illumination on polymer surfaces

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Abstract

Sub-micrometer grating-like structures were generated on the surface of poly-carbonate (PC) films by polarized ArF excimer laser illumination well below the material ablation threshold. The period of the laser-induced surface structures was tuned by modifying the angle of incidence of the laser beam. The depth of the modulation was enlarged increasing the number of the laser pulses. The surface changes caused by the laser illumination were investigated by atomic force microscope operating in pulsed force mode. It was proven that not only the topography, but also the micromechanical properties are modulated with sub-micrometer period. Interestingly, the measured adhesion modulation is different from the adhesion modulation calculated by taking into account the tip and sample geometry. The co-existence of a reversed adhesion modulation was proven: the adhesion is increased at the hills caused by material changes, which may over-compensate the topographical effects. FTIR investigations have shown that chemical changes accompany the phase transitions leading to the structure formation.

Original languageEnglish
Pages (from-to)939-944
Number of pages6
JournalMaterials Science and Engineering C
Volume23
Issue number6-8
DOIs
Publication statusPublished - Dec 15 2003

Fingerprint

ultraviolet lasers
micrometers
Polymers
adhesion
Adhesion
Lighting
illumination
Modulation
modulation
Lasers
polymers
lasers
Carbonates
Excimer lasers
Ablation
Surface structure
excimer lasers
Topography
ablation
Laser beams

Keywords

  • Adhesion
  • Atomic force microscopy
  • FTIR
  • Laser-induced periodic surface structure
  • Poly-carbonate
  • Pulsed force mode

ASJC Scopus subject areas

  • Biomaterials

Cite this

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title = "The existence of sub-micrometer micromechanical modulation generated by polarized UV laser illumination on polymer surfaces",
abstract = "Sub-micrometer grating-like structures were generated on the surface of poly-carbonate (PC) films by polarized ArF excimer laser illumination well below the material ablation threshold. The period of the laser-induced surface structures was tuned by modifying the angle of incidence of the laser beam. The depth of the modulation was enlarged increasing the number of the laser pulses. The surface changes caused by the laser illumination were investigated by atomic force microscope operating in pulsed force mode. It was proven that not only the topography, but also the micromechanical properties are modulated with sub-micrometer period. Interestingly, the measured adhesion modulation is different from the adhesion modulation calculated by taking into account the tip and sample geometry. The co-existence of a reversed adhesion modulation was proven: the adhesion is increased at the hills caused by material changes, which may over-compensate the topographical effects. FTIR investigations have shown that chemical changes accompany the phase transitions leading to the structure formation.",
keywords = "Adhesion, Atomic force microscopy, FTIR, Laser-induced periodic surface structure, Poly-carbonate, Pulsed force mode",
author = "M. Csete and J. Kokavecz and Z. Bor and O. Marti",
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T1 - The existence of sub-micrometer micromechanical modulation generated by polarized UV laser illumination on polymer surfaces

AU - Csete, M.

AU - Kokavecz, J.

AU - Bor, Z.

AU - Marti, O.

PY - 2003/12/15

Y1 - 2003/12/15

N2 - Sub-micrometer grating-like structures were generated on the surface of poly-carbonate (PC) films by polarized ArF excimer laser illumination well below the material ablation threshold. The period of the laser-induced surface structures was tuned by modifying the angle of incidence of the laser beam. The depth of the modulation was enlarged increasing the number of the laser pulses. The surface changes caused by the laser illumination were investigated by atomic force microscope operating in pulsed force mode. It was proven that not only the topography, but also the micromechanical properties are modulated with sub-micrometer period. Interestingly, the measured adhesion modulation is different from the adhesion modulation calculated by taking into account the tip and sample geometry. The co-existence of a reversed adhesion modulation was proven: the adhesion is increased at the hills caused by material changes, which may over-compensate the topographical effects. FTIR investigations have shown that chemical changes accompany the phase transitions leading to the structure formation.

AB - Sub-micrometer grating-like structures were generated on the surface of poly-carbonate (PC) films by polarized ArF excimer laser illumination well below the material ablation threshold. The period of the laser-induced surface structures was tuned by modifying the angle of incidence of the laser beam. The depth of the modulation was enlarged increasing the number of the laser pulses. The surface changes caused by the laser illumination were investigated by atomic force microscope operating in pulsed force mode. It was proven that not only the topography, but also the micromechanical properties are modulated with sub-micrometer period. Interestingly, the measured adhesion modulation is different from the adhesion modulation calculated by taking into account the tip and sample geometry. The co-existence of a reversed adhesion modulation was proven: the adhesion is increased at the hills caused by material changes, which may over-compensate the topographical effects. FTIR investigations have shown that chemical changes accompany the phase transitions leading to the structure formation.

KW - Adhesion

KW - Atomic force microscopy

KW - FTIR

KW - Laser-induced periodic surface structure

KW - Poly-carbonate

KW - Pulsed force mode

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