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Nanomaterials 2018, 8(1), 36;

Positron Spectroscopy of Nanodiamonds after Hydrogen Sorption

Department of General Physics, Institute of Physics and Technology, Tomsk Polytechnic University, 634000 Tomsk, Russia
Department of Higher Mathematics, Faculty of General Education, Tomsk State University of Architecture and Building, 634003 Tomsk, Russia
Author to whom correspondence should be addressed.
Received: 30 November 2017 / Revised: 9 January 2018 / Accepted: 10 January 2018 / Published: 11 January 2018
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The structure and defects of nanodiamonds influence the hydrogen sorption capacity. Positronium can be used as a sensor for detecting places with the most efficient capture of hydrogen atoms. Hydrogenation of carbon materials was performed from gas atmosphere. The concentration of hydrogen absorbed by the sample depends on the temperature and pressure. The concentration 1.2 wt % is achieved at the temperature of 243 K and the pressure of 0.6 MPa. The hydrogen saturation of nanodiamonds changes the positron lifetime. Increase of sorption cycle numbers effects the positron lifetime, as well as the parameters of the Doppler broadening of annihilation line. The electron-positron annihilation being a sensitive method, it allows detecting the electron density fluctuation of the carbon material after hydrogen saturation. View Full-Text
Keywords: nanodiamonds; positron spectroscopy; hydrogen sorption nanodiamonds; positron spectroscopy; hydrogen sorption

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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited (CC BY 4.0).

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Nikitina, L.; Laptev, R.; Abzaev, Y.; Lider, A.; Ivashutenko, A. Positron Spectroscopy of Nanodiamonds after Hydrogen Sorption. Nanomaterials 2018, 8, 36.

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