Positron Spectroscopy of Nanodiamonds after Hydrogen Sorption

Nanomaterials

Roman Laptev¹  Alexander Ivashutenko¹  Lyudmila Nikitina¹  Andrey Lider¹  Yuri Abzaev² 

[1] 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;

关键词: nanodiamonds;    positron spectroscopy;    hydrogen sorption;   

DOI  :  10.3390/nano8010036

来源: DOAJ

【 摘 要 】

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.

【 授权许可】

Unknown