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<p>Astronomical optical components operating in open environments are highly susceptible to moisture condensation, frost formation, and contaminant deposition, all of which can degrade optical efficiency and service life. In this study, three graphene oxide (GO)-based nanocomposite thin films, including GO+SiO<sub>2</sub>, GO+TiO<sub>2</sub>, and GO + ZnO, were anchored on glass substrates by spray pyrolysis with and without plasma-jet treatment in order to evaluate the effect of plasma exposure on their structural, morphological, and wettability properties. The coatings were characterized using XRD, FTIR, Raman spectroscopy, FESEM, AFM, and EDXS analyses. Moreover, wettability was assessed through water contact angle and slide angle measurements. The results obtained from XRD and Raman spectroscopy respectively revealed that plasma-jet treatment reduces interplanar spacing inconsiderably and increases I<sub>D</sub>/I<sub>G</sub> ratio of synthesized nanocomposites negligibly. In contrast, AFM demonstrated a pronounced increase in surface roughness after plasma treatment, from 12.85 to 43.34&#xa0;nm for GO+SiO<sub>2</sub>, from 3.25 to 38.48&#xa0;nm for GO+TiO<sub>2</sub>, and from 8.93 to 30.12&#xa0;nm for GO + ZnO. Plasma-jet treatment not only affected structurally the synthesized nanocomposites, but also led to a substantial enhancement in their wettability. In this regard, the plasma-jet treated nanocomposites reached water contact angles &gt; 90°, implying a transition to hydrophobic behavior. Unlike wettability, the slide angles of the samples were reduced as a result of plasma-jet treatment. Our findings demonstrated that plasma-jet treatment is an effective route for producing hydrophobic GO-based nanocomposite coatings, which could be due to different reasons, for instance surface roughening and morphological reorganization, making them promising candidates for different applications.</p>

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Effect of plasma treatment on the structural, morphological, and wettability properties of graphene oxide-based nanocomposite thin films

  • 期刊论文

  • 发表日期：

    2026年7月30日

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  • Ala F. Ahmed,
  • Saba J. Kadhem,
  • Ahmed Hmeed Wanas,
  • Falah A-H. Mutlak

摘要

Astronomical optical components operating in open environments are highly susceptible to moisture condensation, frost formation, and contaminant deposition, all of which can degrade optical efficiency and service life. In this study, three graphene oxide (GO)-based nanocomposite thin films, including GO+SiO2, GO+TiO2, and GO + ZnO, were anchored on glass substrates by spray pyrolysis with and without plasma-jet treatment in order to evaluate the effect of plasma exposure on their structural, morphological, and wettability properties. The coatings were characterized using XRD, FTIR, Raman spectroscopy, FESEM, AFM, and EDXS analyses. Moreover, wettability was assessed through water contact angle and slide angle measurements. The results obtained from XRD and Raman spectroscopy respectively revealed that plasma-jet treatment reduces interplanar spacing inconsiderably and increases ID/IG ratio of synthesized nanocomposites negligibly. In contrast, AFM demonstrated a pronounced increase in surface roughness after plasma treatment, from 12.85 to 43.34 nm for GO+SiO2, from 3.25 to 38.48 nm for GO+TiO2, and from 8.93 to 30.12 nm for GO + ZnO. Plasma-jet treatment not only affected structurally the synthesized nanocomposites, but also led to a substantial enhancement in their wettability. In this regard, the plasma-jet treated nanocomposites reached water contact angles > 90°, implying a transition to hydrophobic behavior. Unlike wettability, the slide angles of the samples were reduced as a result of plasma-jet treatment. Our findings demonstrated that plasma-jet treatment is an effective route for producing hydrophobic GO-based nanocomposite coatings, which could be due to different reasons, for instance surface roughening and morphological reorganization, making them promising candidates for different applications.