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

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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

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Publication details

The article was received on 29 Aug 2017, accepted on 05 Dec 2017 and first published on 05 Dec 2017


Article type: Paper
DOI: 10.1039/C7CP05898E
Citation: Phys. Chem. Chem. Phys., 2018, Advance Article
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    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, Advance Article , DOI: 10.1039/C7CP05898E

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