Nuclear magnetic resonance study of ultrananocrystalline diamonds

A. M. Panich, A. I. Shames, H. M. Vieth, E. Osawa, M. Takahashi, A. Ya Vul'

Research output: Contribution to journalArticlepeer-review

97 Scopus citations

Abstract

We report on a nuclear magnetic resonance (NMR) study of ultrananocrystalline diamond (UNCD) materials produced by detonation technique. Analysis of the 13C and 1H 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.

Original languageEnglish
Pages (from-to)397-402
Number of pages6
JournalEuropean Physical Journal B
Volume52
Issue number3
DOIs
StatePublished - 1 Aug 2006

Keywords

  • 61.46.-w Nanoscale materials
  • 68.65.-k Low-dimensional, mesoscopic, and nanoscale systems: structure and nonelectronic properties
  • 76.60.-k Nuclear magnetic resonance and relaxation

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics

Fingerprint

Dive into the research topics of 'Nuclear magnetic resonance study of ultrananocrystalline diamonds'. Together they form a unique fingerprint.

Cite this