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Closed -Electron Network in Large Polyhedral Multi-Shell Carbon Nanoparticles

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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 ΔHpp > 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.
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Keywords: CARBON ONIONS; DELOCALIZED ELECTRONS; MAGNETIC RESONANCE; MAGNETIC SUSCEPTIBILITY; MULTI-SHELL POLYHEDRAL NANOPARTICLES

Document Type: Short Communication

Publication date: February 1, 2011

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  • Nanoscience and Nanotechnology Letters (NNL) is a multidisciplinary peer-reviewed journal consolidating nanoscale research activities in all disciplines of science, engineering and medicine into a single and unique reference source. NNL provides the means for scientists, engineers, medical experts and technocrats to publish original short research articles as communications/letters of important new scientific and technological findings, encompassing the fundamental and applied research in all disciplines of the physical sciences, engineering and medicine.
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