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A.V. Okotrub¹, D.V. Gorodetskii¹, Y.N. Palyanov², A.L. Chuvilin³, L.G. Bulusheva¹

1 – Nikolaev Institute of Inorganic Chemistry, SB RAS, 630090 Novosibirsk, Russia

2 – Sobolev Institute of Geology and Mineralogy SB RAS, 630090 Novosibirsk, Russia

3 – CIC nanoGUNE Consolider, E-20018 San Sebastian, Spain

spectrum@niic.nsc.ru

Diamond crystals with a facet size exceeding the size of the focus of the X-ray beam incident on the sample were synthesized by the HPHT method were heated to a temperature of 850 °C and 1250 °C for 15 minutes. Annealing of samples of single crystals was carried out in a high-vacuum chamber of the Russian-German laboratory at the BESSY II synchrotron source. XPS spectroscopy was used to study the structure of carbon layers on diamond faces of different symmetries and with thin layers of iron and nickel deposited on a diamond. A higher rate of graphitization of the (111) face is shown. From the data of the angular dependence of NEXAFS, the directionality of the sp² carbon layers relative to the diamond surface is determined. The data obtained indicate a catalytic effect of the metal on the process of the formation of graphene structures. Transmission electron microscopy data demonstrate the characteristic size and misorientation of individual graphene layers for different symmetry of diamond faces.

Acknowledgement.This work was supported by the Russian Foundation for Basic Research, grant 19-03-00425.

Prof. Dr. Alexander Okotrub

Alexander Okotrub graduated from the Physics Department of Novosibirsk State University in 1980, specialized in the Chemical Physics. Since 1980, A. Okotrub worked as an intern-researcher at Nikolaev Institute of Inorganic Chemistry SB RAS (NIIC SB RAS) as post-graduate student, junior researcher, research associate, senior researcher, leading researcher and principal researcher. At present he is the head of the Laboratory of Physics Chemistry of Nanomaterials and the head of the Department of the Chemistry of Functional Materials of the NIIC SB RAS. He is professor in physical chemistry and leads the Laboratory of Carbon Nanomaterials at the Novosibirsk State University. In his work, an approach is used that combines methods for synthesizing carbon nanostructures (fullerenes, nanotubes, graphene, nanodiamonds, etc.), methods for their chemical modification and the creation of composite and hybrid structures, as well as methods for studying the structure and physicochemical properties of the produced materials. Considerable attention is paid to X-ray and photoelectron spectroscopy and quantum-chemical calculations for studying the electronic structure and properties of new materials. A. Okotrub published 360 scientific papers. He lectures on "Functional materials" for students of the Novosibirsk State University and "Materials and their properties" for post-graduate students of the NIIC SB RAS.