Nuclear magnetic resonance study of ultrananocrystalline diamonds

A. M. Panich (), A. I. Shames, H.-M. Vieth, E. Ōsawa, M. Takahashi and A. Ya. Vul'

The European Physical Journal B: Condensed Matter and Complex Systems, 2006, vol. 52, issue 3, 397-402

Abstract: We report on a nuclear magnetic resonance (NMR) study of ultrananocrystalline diamond (UNCD) materials produced by detonation technique. Analysis of the 13 C and 1 H NMR spectra, spin-spin and spin-lattice relaxation times in purified UNCD samples is presented. Our measurements show that UNCD particles consist of a diamond core that is partially covered by a sp 2 -carbon fullerene-like shell. The uncovered part of outer diamond surface comprises a number of hydrocarbon groups that saturate the dangling bonds. Our findings are discussed along with recent calculations of the UNCD structure. Significant increase in the spin-lattice relaxation rate (in comparison with that of natural diamond), as well as stretched exponential character of the magnetization recovery, are attributed to the interaction of nuclear spins with paramagnetic centers which are likely fabrication-driven dangling bonds with unpaired electrons. We show that these centers are located mainly at the interface between the diamond core and shell. Copyright EDP Sciences/Società Italiana di Fisica/Springer-Verlag 2006

Keywords: 61.46.-w Nanoscale materials; 76.60.-k Nuclear magnetic resonance and relaxation; 68.65.-k Low-dimensional; mesoscopic; and nanoscale systems: structure and nonelectronic properties (search for similar items in EconPapers)
Date: 2006
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DOI: 10.1140/epjb/e2006-00314-7

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