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Revealing the effect of graphite source on the properties of synthesized graphene oxide

  • Carbon Letters
  • Abbr : Carbon Lett.
  • 2024, 34(4), pp.1219-1228
  • DOI : 10.1007/s42823-023-00680-3
  • Publisher : Korean Carbon Society
  • Research Area : Natural Science > Natural Science General > Other Natural Sciences General
  • Received : October 1, 2023
  • Accepted : December 21, 2023
  • Published : June 14, 2024

Ioni Yulia 1,  Khamidullin Timur 2,  Sapkov Ivan 3,  Brysko Vasiliy 2,  Dimiev Ayrat M. 2

1Kurnakov Institute of General and Inorganic Chemistry of Russian Academy of Science
2Kazan Federal University
3Faculty of Physics, M.V. Lomonosov Moscow State University

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ABSTRACT

Despite enormous popularity of graphene oxide (GO) several open questions remain regarding the structure and properties of this material. One of those questions is the role of a graphite precursor on the properties of GO product. In this study, we investigate the oxidation process and the structure of GO products, made from the four different graphite precursors: synthetic graphite, two natural flaky graphites, and expanded graphite. The highest rate of the oxidation reaction was registered for the small particle size synthetic graphite. Thermal expansion of natural flaky graphite did not significantly affect the rate of the reaction. The nature of the graphite precursor does not notably affect the chemical composition of the synthesized GO products. However, it affects stability of respective aqueous dispersions. The solutions of the three GO samples, prepared from the natural graphite sources demonstrate excellent stability due to complete exfoliation of GO to single-atomic-layer sheets. GO from synthetic graphite forms unstable dispersions due to the presence of numerous multi-layered particles. This, in turn, is explained by the presence of not fully graphitized, amorphous inclusions in synthetic graphite. Our observations suggest that synthetic graphite should not be used as GO precursor when the ability to completely exfoliate and the stability of dispersions are critical for intended applications. This is a preview of subscription cont

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