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Defects and impurities in nanodiamonds: EPR, NMR and TEM study |
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| Authors: | AI Shames AM PanichW Kempiński AE AlexenskiiMV Baidakova AT DideikinVYu Osipov VI SiklitskiE Osawa M OzawaAYa Vul' |
| Institution: | a Department of Physics, Ben-Gurion University of the Negev, P.O. Box 653, 84 105 Be'er-Sheva, Israel b Institute of Molecular Physics, Polish Academy of Sciences, Smoluchowskiego 17, 60-179 Poznań, Poland c Ioffe Physico-Technical Institute, 26 Polytechnicheskaya, St Petersburg 194021, Russian Federation d Toyohashi University of Technology, Toyohashi, Japan |
| Abstract: | EPR, 13C NMR and TEM study of ultradisperse diamond (UDD) samples is reported. The compounds show a high concentration of paramagnetic centers (up to 1020 spin/g), which are due to structural defects (dangling C-C bonds) on the diamond cluster surface. The anomalous reduction in the spin-lattice relaxation time of 13C (from several hours in natural diamond to ∼150 ms in UDD clusters) is attributed to the interaction between the unpaired electrons of the paramagnetic centers and nuclear spins. 13C NMR line-width reflects the fact that the structure of the UDD surface is distorted in comparison to the ‘bulk’ diamond structure. |
| Keywords: | D Electron paramagnetic resonance (EPR) D Nuclear magnetic resonance (NMR) |
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