Issue 3, 2018

Angstrom-scale probing of paramagnetic centers location in nanodiamonds by 3He NMR at low temperatures

Abstract

In this article a method to assess the location of paramagnetic centers in nanodiamonds was proposed. The nuclear magnetic relaxation of adsorbed 3He used as a probe in this method was studied at temperatures of 1.5–4.2 K and magnetic fields of 100–600 mT. A strong influence of the paramagnetic centers of the sample on the 3He nuclear spin relaxation time T1 was found. Preplating the nanodiamond surface with adsorbed nitrogen layers allowed us to vary the distance from 3He nuclei to paramagnetic centers in a controlled way and to determine their location using a simple model. The observed T1 minima in temperature dependences are well described within the frame of the suggested model and consistent with the concentration of paramagnetic centers determined by electron paramagnetic resonance. The average distance found from the paramagnetic centers to the nanodiamond surface (0.5 ± 0.1 nm) confirms the well-known statement that paramagnetic centers in this type of nanodiamond are located in the carbon shell. The proposed method can be applied to detailed studies of nano-materials at low temperatures.

Graphical abstract: Angstrom-scale probing of paramagnetic centers location in nanodiamonds by 3He NMR at low temperatures

Associated articles

Supplementary files

Article information

Article type
Paper
Submitted
29 Aug 2017
Accepted
05 Dec 2017
First published
05 Dec 2017
This article is Open Access
Creative Commons BY-NC license

Phys. Chem. Chem. Phys., 2018,20, 1476-1484

Angstrom-scale probing of paramagnetic centers location in nanodiamonds by 3He NMR at low temperatures

V. Kuzmin, K. Safiullin, G. Dolgorukov, A. Stanislavovas, E. Alakshin, T. Safin, B. Yavkin, S. Orlinskii, A. Kiiamov, M. Presnyakov, A. Klochkov and M. Tagirov, Phys. Chem. Chem. Phys., 2018, 20, 1476 DOI: 10.1039/C7CP05898E

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