Hybrid sp2+sp3 carbon phases created from carbon nanotubes

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Abstract

Using the density functional theory in the gradient approximation (DFT-GGA) methods was calculated the geometrically optimized structure and electronic properties for six new hybrid carbon phases. These hybrid phases consists of atoms in three - and four-coordinated (sp2+sp3-hybridized) states. The initial structure of the carbon phases was constructed by partial cross-linking of (8,0) carbon nanotube bundles. Sublimation energies calculated for hybrid phases above the sublimation energy of cubic diamond, however, fall into the range of values typical for carbon materials, which are stable under normal conditions. The density of electronic states at the Fermi energy for the two phases is non-zero and these phases should have metallic properties. The other hybrid phases should be semiconductors with a band gap from 0.5 to 1.1 eV.

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Tingaev, M. I., & Belenkov, E. A. (2017). Hybrid sp2+sp3 carbon phases created from carbon nanotubes. In Journal of Physics: Conference Series (Vol. 917). Institute of Physics Publishing. https://doi.org/10.1088/1742-6596/917/3/032013

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