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Surface adhesion of back-illuminated ultrafast laser-treated polymers

From National Research Council Canada

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DOIResolve DOI: https://doi.org/10.1103/PhysRevMaterials.5.045201
AuthorSearch for: 1ORCID identifier: https://orcid.org/0000-0002-2802-7390; Search for: 1; Search for: 1ORCID identifier: https://orcid.org/0000-0002-1651-0115; Search for: 1; Search for: 1; Search for: 1ORCID identifier: https://orcid.org/0000-0003-3394-5572
Affiliation
  1. National Research Council of Canada. Security and Disruptive Technologies
FormatText, Article
Abstract
We report a decreased surface wettability when polymer films on a glass substrate are treated by ultrafast laser pulses in a back-illumination geometry. We propose that back illumination through the substrate confines chemical changes beneath the surface of polymer films, leaving the surface blistered but chemically intact. To confirm this hypothesis, we measure the phase contrast of the polymer when imaged with a focused ion beam. We observe a void at the polymer-quartz interface that results from the expansion of an ultrafast laser-induced plasma. A modified polymer layer surrounds the void, but otherwise the film seems unmodified. We also use x-ray photoelectron spectroscopy to confirm that there is no chemical change to the surface. When patterned with partially overlapping blisters, our polymer surface shows increased hydrophobicity. The increased hydrophobicity of back-illuminated surfaces can only result from the morphological change. This contrasts with the combined chemical and morphological changes of the polymer surface caused by a front-illumination geometry.
Publication date
PublisherAmerican Physical Society
In
  • Physical Review Materials 5, no. 4, 045201 (28 April 2021): 045201-1–045201-7.
LanguageEnglish
Peer reviewedYes
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Record identifier572f4ca2-497a-465d-9622-78318f87b38a
Record created2022-01-10
Record modified2022-04-05
Date modified: