Publication detail

Synthesis Dynamics of Graphite Oxide

BANNOV, A. MANAKHOV, A. SHIBAEV, A. UKHINA, A. POLČÁK, J. MAKSIMOVSKII, E.

Original Title

Synthesis Dynamics of Graphite Oxide

Type

journal article in Web of Science

Language

English

Original Abstract

Graphite oxide synthesis dynamics were investigated using a sampling technique. The synthesis of graphite oxide was carried out by a modified Hummers’ method. Small samples of the solid phase (30–50 mg) were collected from the reaction mixture and analyzed by thermogravimetric analysis, differential scanning calorimetry, scanning electron microscopy, X-ray diffraction, Raman spectroscopy, energy dissipative X-ray spectroscopy, and X-ray photoelectron spectroscopy. The strongest oxidation was detected 10 min after the start of the synthesis, i.e., after the addition of KMnO4, when the formation of the graphite oxide phase with intercalated guest molecules begins. The intercalation of graphite started after 30 min of synthesis when the temperature was increased to 35°C. The addition of ice into the reaction mixture leads to the increase in the COOH group concentration, whereas the concentration of C=O groups slightly changes, and the concentration of the C–O and C=O groups remains almost constant. It was found that the degree of oxidation of graphite oxide exhibited complex change, and H2O2 plays a significant role not only in the removal of impurities but also in the increase in the GO oxidation degree that is reflected by a higher concentration of oxygen-containing functional groups. Differential scanning calorimetry and thermogravimetric analysis data confirmed that the additions of ice and H2O2 induce the stronger formation of surface functional groups instead of intercalated guest species.

Keywords

graphite oxide, synthesis, thermal analysis, Hummers’ method

Authors

BANNOV, A.; MANAKHOV, A.; SHIBAEV, A.; UKHINA, A.; POLČÁK, J.; MAKSIMOVSKII, E.

Released

10. 5. 2018

Publisher

Elsevier

ISBN

0040-6031

Periodical

Thermochimica Acta

Year of study

663

Number

1

State

Kingdom of the Netherlands

Pages from

165

Pages to

175

Pages count

11

URL

https://www.sciencedirect.com/science/article/pii/S0040603118300960

Full text in the Digital Library

http://hdl.handle.net/11012/245260

BibTex

@article{BUT149864,
  author="Alexander G. {Bannov} and Anton {Manakhov} and Alexander A. {Shibaev} and A.V. {Ukhina} and Josef {Polčák} and E. A. {Maksimovskii}",
  title="Synthesis Dynamics of Graphite Oxide",
  journal="Thermochimica Acta",
  year="2018",
  volume="663",
  number="1",
  pages="165--175",
  doi="10.1016/j.tca.2018.03.017",
  issn="0040-6031",
  url="https://www.sciencedirect.com/science/article/pii/S0040603118300960"
}