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

Abstract

In this article the 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. The strong influence of 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 distance from 3He nuclei to paramagnetic centers in a controlled way and to determine their location using the simple model. The observed T1 minimums in temperature dependences are well described within the frame of suggested model and consistent with the concentration of paramagnetic centers determined by electron paramagnetic resonance. The found average distance from paramagnetic centers to the nanodiamond surface (0.5±0.1 nm) confirms the well-known statement that paramagnetic centers in this type of nanodiamonds are loacated in the carbon shell. The proposed method can be applied to detailed studies of nano-materials 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., 2017, Accepted Manuscript
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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. Y. Presnyakov, A. Klochkov and M. Tagirov, Phys. Chem. Chem. Phys., 2017, Accepted Manuscript , DOI: 10.1039/C7CP05898E

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