Journal
NANOSCIENCE AND NANOTECHNOLOGY LETTERS
Volume 3, Issue 1, Pages 63-67Publisher
AMER SCIENTIFIC PUBLISHERS
DOI: 10.1166/nnl.2011.1121
Keywords
Substitutional Nitrogen; Nanodiamond; Surface Paramagnetic Centers; Electron Paramagnetic Resonance
Funding
- Space and Naval Warfare Systems Centers (SSC) [N66001-04-1-8933]
- Russian Foundation for Basic Research [08-02-01306, 08-05-00745]
- European Union under Integrated Infrastructure Initiative [026019 ESTEEM]
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Production of nanodiamond particles containing substitutional nitrogen is important for a wide variety of advanced applications. In the current work nanodiamond particles synthesized from a mixture of graphite and hexogen were analyzed to determine the presence of substitutional nitrogen using pulsed electron paramagnetic resonance (EPR) spectroscopy. Nitrogen paramagnetic centers in the amount of 1.2 ppm have been identified. The spin relaxation characteristics for both nitrogen and surface defects are also reported. A new approach for efficient depletion of the strong non-nitrogen ERR signal in nanodiamond material by immersing nanodiamond particles into ice matrix is suggested. This approach allows an essential decrease of the spin relaxation time of the dominant non-nitrogen defects, while preserving the substitutional nitrogen spin relaxation time.
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