Keyword: «sp²/sp³ hybridization»

NUCLEAR MAGNETIC RESONANCE SPECTROSCOPY OF DETONATION AND NATURAL NANODIAMONDS BEFORE AND AFTER THERMAL TREATMENT

Authors:

Mariya Akimova,

Anastasiya Sivceva,

Petr Sharin,

Vladilina Koryakina,

Sofya Yakovleva

The detonation and natural nanodiamonds were investigated using nuclear magnetic resonance (NMR) spectroscopy before and after thermal treatment. The NMR spectra of the initial samples revealed signals from sp³- and sp²-hybridized carbon atoms corresponding to the diamond core and disordered carbon shell. Thermal annealing at 550 °C leads to a decrease in non-diamond sp² carbon and changes in the surface functional groups. The results confirm the effectiveness of thermal purification of nanodiamonds.

Keywords: nanodiamonds, thermal treatment, carbon structure, nuclear magnetic resonance, spectroscopy, sp²/sp³ hybridization