Study of potassium intercalated graphite by Raman spectroscopy
Z.A. Akhmatov1,2,3, A.Kh. Khokonov2,3, I.N. Sergeev2, M.G. Ambartsumov4
1 Kabardino-Balkarian State University named after H.M. Berbekov
2 Institute of Nuclear Research of RAS
3 Kabardino-Balkarian Scientific Center of RAS
4 Leading Researcher of North-Caucasus Federal University
DOI: 10.26456/pcascnn/2024.16.024
Original article
Abstract: In this paper, a study of a graphite intercalation compound by potassium was carried out using Raman spectroscopy. The purpose of the study was to determine the intercalation stage and study the influence of intercalated atoms on the vibrational properties of highly oriented pyrolytic graphite lattice. The intercalation of highly oriented pyrolytic graphite by potassium was performed using a two-zone method. Raman spectra were obtained for both pure and intercalated highly oriented pyrolytic graphite. The experiments carried out to identify the synthesized structures showed the formation of sixth stage graphite intercalation compound. Knowledge of the stage of the intercalated graphite compounds is important for its use as a superconducting material, as well as in supercapacitors. In addition, the intercalation stage is a key factor in obtaining graphene by chemical exfoliation of graphite intercalation compound, since the number of graphene layers will directly depend on the intercalation stage. In the obtained Raman spectra, the effect of G-peak splitting is observed, indicating a change in the vibrational properties of the graphite lattice during its intercalation due to the charge transfer from the intercalate to the carbon layers. The value of the transferred charge is determined using first-principles calculations.
Keywords: Raman spectroscopy, highly oriented pyrolytic graphite, alkali metals, intercalation, two- zone method, first-principles calculations
- Zeitun A. Akhmatov – Ph. D., Senior Researcher of the Department of Theoretical and Experimental Physics, Kabardino-Balkarian State University named after H.M. Berbekov, Senior Researcher of the Laboratory of Astrophysics and Cosmic Ray Physics Institute of Nuclear Research of RAS, Senior Researcher of the Institute of Informatics and Regional Management Problems Kabardino-Balkarian Scientific Center of RAS
- Azamat Kh. Khokonov – Leading Researcher, Institute of Nuclear Research of RAS, Senior Researcher of the Institute of Informatics and Regional Management Problems Kabardino-Balkarian Scientific Center of RAS
- Igor N. Sergeev – Ph. D., Senior Researcher of the Laboratory of Astrophysics and Cosmic Ray Physics, Institute of Nuclear Research of RAS
- Mikhail G. Ambartsumov – Ph. D, Leading Researcher of North-Caucasus Federal University
Reference:
Akhmatov, Z.A. Study of potassium intercalated graphite by Raman spectroscopy / Z.A. Akhmatov, A.Kh. Khokonov, I.N. Sergeev, M.G. Ambartsumov // Physical and chemical aspects of the study of clusters, nanostructures and nanomaterials. — 2024. — I. 16. — P. 24-32. DOI: 10.26456/pcascnn/2024.16.024. (In Russian).
Full article (in Russian): download PDF file
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