Closed π-electron network in large polyhedral multi-shell carbon nanoparticles

A. I. Shames, I. Felner, V. Yu Osipov, E. A. Katz, E. Mogilko, J. Grinblat, A. M. Panich, V. P. Belousov, I. M. Belousova, A. N. Ponomarev

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19 Scopus citations


High Resolution Transmission Electron Microscopy (HRTEM) reveals a polyhedral multi-shell fullerene-like structure of astralen carbon nanoparticles. The polyhedra consist of large flat graphitic faces connected by defective edge regions with presumably pentagon-like structure. The faces comprise a stacking of 20-50 planar graphene sheets with inter-sheet distance of ̃0.340 nm. Average sizes of the particles and their flat faces are ̃40 nm and ̃15 nm, respectively. Astralen particles are suggested to have defect-free sp2 flat faces and all defects condense at their polyhedral edges. Multi-frequency Electron Paramagnetic Resonance (EPR) spectra of polycrystalline astralen samples reveal two main signals: a very broad signal with AHpp > 1 T and an asymmetric relatively narrow signal that consists of two Lorentzian components in g = 2.00 region. The intensities of all X-band EPR signals show no changes on decreasing temperature down to T = 4 K. Magnetic susceptibility demonstrates strong temperature dependent orbital diamagnetism. All unusual magnetic features of astralen are attributed to prevalent itinerant spins.

Original languageEnglish
Pages (from-to)41-48
Number of pages8
JournalNanoscience and Nanotechnology Letters
Issue number1
StatePublished - 1 Feb 2011


  • Carbon onions
  • Delocalized electrons
  • Magnetic resonance
  • Magnetic susceptibility
  • Multi-shell
  • Polyhedral nanoparticles

ASJC Scopus subject areas

  • General Materials Science


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