Heteroatom necklaces of sp2 amorphous carbons. XPS supported INS and DRIFT spectroscopy

In the case of sp2 amorphous carbons, formed by nanoscale graphene domains framed by heteroatom necklaces (basic structure units in total), inelastic neutron scattering and photoabsorption ensure studying vibrational spectra of the latter mainly. Examination of a set of samples of the highest carbonization rank representing natural substances (shungite carbon, anthraxolite, and anthracite), technical graphenes (laboratory reduced graphene oxides), and industrial products (carbon blacks) has shown, that while INS spectra revealed the hydrogen-enriched component of these necklaces only, the DRIFT spectra exhibited two components determined by both hydrogen and oxygen compositions. Taking together, INS and DRIFT spectra exhibit methine groups, typifying the hydrogen component of all natural amorphics as well as hydroxymethyls and methyls doing the same job for the studied technical graphenes, and hydroxyfurans - for carbon blacks. A comparable analysis of DRIFT and XPS spectra has allowed a reliable personification of the oxygen functional groups compositions. Based on the results obtained, a set of reliable molecular models of the amorphics’ basic structural units has been proposed. © 2020 Taylor & Francis Group, LLC.

Sheka E.F. 1 , Natkaniec I. 2 , Ipatova E.U.3 , Golubev Y.A.4 , Kabachkov E.N.5, 6 , Popova V.A. 1
Taylor and Francis Inc.
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  • 1 Institute of Physical Research and Technology, Peoples’ Friendship University (RUDN University) of Russia, Moscow, Russian Federation
  • 2 Faculty of Physics, Adam Mickiewicz University, Poznań, Poland
  • 3 Institute of Chemistry, Komi Science Center, Ural Branch of RAS, Syktyvkar, Russian Federation
  • 4 Yushkin’s Institute of Geology, Komi Science Center, Ural Branch of RAS, Syktyvkar, Russian Federation
  • 5 Department of Functional Materials for Chemical Energy Sources, Institute of Problems of Chemical Physics of Russian Academy of Sciences (IPCP RAS), Chernogolovka, Russian Federation
  • 6 Scientific Center in Chernogolovka RAS, Chernogolovka, Russian Federation
Ключевые слова
amorphous carbon; FTIR reflection; graphene domain; heteroatom necklace; Inelastic neutron scattering; molecular models; X-ray photoelectron spectroscopy
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Atmospheric Chemistry and Physics. Copernicus GmbH. Том 20. 2020. С. 8551-8592