(13)C spin-lattice relaxation in nanodiamonds in static and magic angle spinning regimes

N A Sergeev; A M Panich; M Olszewski; O Shenderova; S D Goren

doi:10.1016/j.ssnmr.2014.10.008

(13)C spin-lattice relaxation in nanodiamonds in static and magic angle spinning regimes

Solid State Nucl Magn Reson. 2015 Apr-May:66-67:51-55. doi: 10.1016/j.ssnmr.2014.10.008. Epub 2014 Nov 13.

Authors

N A Sergeev¹, A M Panich², M Olszewski¹, O Shenderova³, S D Goren⁴

Affiliations

¹ Institute of Physics, University of Szczecin, 70-451 Szczecin, Poland.
² Department of Physics, Ben-Gurion University of the Negev, P. O. Box 653, Be'er Sheva 8410501, Israel. Electronic address: pan@bgu.ac.il.
³ International Technology Center, Raleigh, North Carolina 27617, United States.
⁴ Department of Physics, Ben-Gurion University of the Negev, P. O. Box 653, Be'er Sheva 8410501, Israel.

PMID: 25465482
DOI: 10.1016/j.ssnmr.2014.10.008

Abstract

We report on (13)C nuclear spin-lattice relaxation time (T1) dependence on the magic-angle-spinning (MAS) rate in powder nanodiamond samples. We confirm that the relaxation is caused by interaction of nuclear spins with fluctuating electron spins of localized paramagnetic defects. It was found that T1 is practically not affected by MAS for small particles, while for larger particles with lower defect density T1 is different in static and MAS regimes and reveals elongation with increasing MAS rate. This effect is attributed to suppression of nuclear spin diffusion by MAS. We propose an approach that describes T1 dependence on the MAS rate and allows quantitative analysis of this effect.

Keywords: MAS; NMR; Nanodiamond; Spin diffusion.

Publication types

Research Support, Non-U.S. Gov't