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

doi:10.1166/nnl.2011.1117

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

Abstract

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 AH_pp > 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 language	English
Pages (from-to)	41-48
Number of pages	8
Journal	Nanoscience and Nanotechnology Letters
Volume	3
Issue number	1
DOIs	https://doi.org/10.1166/nnl.2011.1117
State	Published - Feb 2011

Keywords

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

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title = "Closed π-electron network in large polyhedral multi-shell carbon nanoparticles",

abstract = "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.",

keywords = "Carbon onions, Delocalized electrons, Magnetic resonance, Magnetic susceptibility, Multi-shell, Polyhedral nanoparticles",

author = "Shames, {A. I.} and I. Felner and Osipov, {V. Yu} and Katz, {E. A.} and E. Mogilko and J. Grinblat and Panich, {A. M.} and Belousov, {V. P.} and Belousova, {I. M.} and Ponomarev, {A. N.}",

year = "2011",

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T1 - Closed π-electron network in large polyhedral multi-shell carbon nanoparticles

AU - Shames, A. I.

AU - Felner, I.

AU - Osipov, V. Yu

AU - Katz, E. A.

AU - Mogilko, E.

AU - Grinblat, J.

AU - Panich, A. M.

AU - Belousov, V. P.

AU - Belousova, I. M.

AU - Ponomarev, A. N.

PY - 2011/2

Y1 - 2011/2

N2 - 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.

AB - 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.

KW - Carbon onions

KW - Delocalized electrons

KW - Magnetic resonance

KW - Magnetic susceptibility

KW - Multi-shell

KW - Polyhedral nanoparticles

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

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