Closed p-Electron Network in Large Polyhedral Multi-Shell Carbon Nanoparticles Academic Article uri icon

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 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 …

publication date

  • February 1, 2011