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LIPSS Structures Induced on Graphene-Polystyrene Composite.

Dominik Fajstavr1, Klára Neznalová2, Václav Švorčík3

  • 1Department of Solid State Engineering, University of Chemistry and Technology Prague, 166 28 Prague, Czech Republic. D.Fajstavr@seznam.cz.

Materials (Basel, Switzerland)
|October 27, 2019
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Summary

Researchers created laser-induced periodic surface structures on graphene-doped polystyrene. This method precisely tunes the material

Keywords:
laser exposurenanocompositespolymers

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Area of Science:

  • Materials Science
  • Nanotechnology
  • Surface Engineering

Background:

  • Polystyrene (PS) is a versatile polymer, but its surface properties can be limited.
  • Graphene nanoplatelets (GNP) offer enhanced mechanical and electrical properties when incorporated into polymer matrices.
  • Controlling surface morphology at the nanoscale is crucial for advanced material applications.

Purpose of the Study:

  • To prepare laser-induced periodic surface structures (LIPSS) on graphene nanoplatelet-doped polystyrene (GNP-PS).
  • To investigate the effect of laser fluence and GNP concentration on the resulting surface morphology and chemical composition.
  • To achieve precisely controlled physico-chemical properties for modified GNP-PS materials.

Main Methods:

  • Graphene nanoplatelets (GNP) were incorporated into polystyrene (PS) via solvent casting.
  • Laser-induced periodic surface structures (LIPSS) were fabricated using a krypton fluoride (KrF) laser (248 nm).
  • Surface morphology was analyzed using atomic force microscopy (AFM) and scanning electron microscopy (SEM).
  • Chemical composition changes, specifically oxygen concentration, were analyzed using energy-dispersive X-ray spectroscopy (EDS).

Main Results:

  • Laser irradiation successfully generated LIPSS on GNP-PS substrates.
  • Surface morphology was significantly altered by laser treatment, forming periodic nanostructures.
  • An increase in oxygen concentration on the PS surface was observed after laser irradiation, confirmed by EDS.
  • The study explored varying GNP concentrations (10-40 wt. %) and laser fluences (0-40 mJ·cm⁻²).

Conclusions:

  • Laser-induced periodic surface structures (LIPSS) are an effective method for modifying the surface of graphene-doped polystyrene.
  • The process allows for precise control over surface morphology and chemical composition, including oxygen incorporation.
  • This technique holds potential for tailoring the properties of graphene-polymer nanocomposites for specific applications.