Properties of graphene flakes obtained by treating graphite with ultrasound

V.O. Yukhymchuk, M.Ya. Valakh, O.M. Hreshchuk, Ye.O. Havrylyuk, I.B. Yanchuk, A.V. Yefanov, R.N. Arif, A.G. Rozhin, M.A. Skoryk

Research output: Contribution to journalArticlepeer-review


A possibility to obtain graphene and graphene layers with the help of the ultrasound (US) treatment of pyrolytic graphite in an N-methyl pyrrolidone (NMP) solution has been demonstrated. Raman spectroscopy is confirmed to be an effective method for monitoring the graphite transformation into graphene. By varying the time of the ultrasonic treatment of pyrolytic graphite in the NMP solution, optimum regimes for the fabrication of graphene flakes with various numbers of layers are determined. In particular, the US treatment for 5 h is shown to be sufficient for producing a colloidal solution of graphene flakes, most of which are single-layered. It is shown that the longer US treatment results in larger intensities of Raman bands D and D, which testifies to a larger number of defects in the graphene layers. The average distances between defects are estimated for various times of US treatment. The influence of vacancy and edge defects on the intensity band ratio ID/ID is analyzed. Vacancies are found to be the prevailing type of defects in the graphene flakes.

Original languageEnglish
Pages (from-to)432-440
Number of pages9
JournalUkrainian Journal of Physics
Issue number5
Publication statusPublished - 31 Jul 2017

Bibliographical note



  • graphene
  • Raman spectroscopy
  • scanning electron microscopy
  • ultrasound treatment
  • vacancy and edge defects


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