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Functionalization of Graphite with Oxidative Plasma.

Paweł Stelmachowski1, Dominik Maj1, Gabriela Grzybek1

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|September 9, 2022
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Summary
This summary is machine-generated.

Plasma treatment of graphite creates oxygen groups, but water immersion reduces its work function and functionalization. Acid washing before plasma treatment stabilizes these properties for effective surface modification.

Keywords:
OFGXPScarbon materialsgraphiteoxygen functional groupsplasmasurface functionalizationwork function

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Area of Science:

  • Materials Science
  • Surface Chemistry
  • Electrochemistry

Background:

  • Surface-modified graphite has diverse applications, including electrodes and adsorbents.
  • Plasma oxidation introduces oxygen groups onto graphite surfaces, but these modifications can be unstable in aqueous environments.
  • Characterizing plasma-treated materials before water contact may not reflect their performance in operational conditions.

Purpose of the Study:

  • To investigate the impact of water immersion on the electronic properties of plasma-oxidized graphite.
  • To evaluate the stability of surface functionalities introduced by plasma treatment.
  • To determine optimal conditions for stable surface modification of graphite for aqueous applications.

Main Methods:

  • Low-temperature plasma oxidation using oxygen and carbon dioxide.
  • Surface functionalization via washing with concentrated nitric and sulfuric acids.
  • Measurement of work function changes and surface oxygen content before and after water immersion.

Main Results:

  • Water immersion significantly decreased the work function of plasma-treated graphite samples.
  • A reduction in surface radicals was observed after water immersion.
  • Acid-washed graphite exhibited a more stable increase in work function after plasma treatment and water immersion.

Conclusions:

  • The stability of plasma-induced surface modifications on graphite is highly dependent on water exposure.
  • Acid washing prior to plasma treatment enhances the stability of surface oxygen species and work function.
  • Acid-washed graphite offers a promising route for achieving stable, functionalized surfaces for aqueous applications.