Keyword: «surface structure»

INFLUENCE OF THERMAL TREATMENT ON THE COMPOSITION OF FUNCTIONAL GROUPS IN DETONATION AND NATURAL NANODIAMONDS

Authors:

Mariya Akimova,

Anastasiya Sivceva,

Petr Sharin,

Sofya Yakovleva

The effect of thermal treatment on the composition of functional groups in detonation and natural nanodiamonds was studied using X-ray photoelectron spectroscopy. It was shown that annealing in air at 400–550 °C leads to a decrease in the fraction of sp²-hybridized carbon atoms and an increase in the sp³ component. Changes in oxygen- and nitrogen-containing functional groups were revealed, indicating oxidation processes and restructuring of surface chemical bonds in nanodiamond particles.

Keywords: functional groups, nanodiamonds, thermal treatment, x-ray photoelectron spectroscopy, surface structure, sp²/sp³ states

IR SPECTROSCOPY OF NANODIAMONDS OBTAINED BY DETONATION SYNTHESIS AND MECHANICAL MILLING BEFORE AND AFTER THERMAL TREATMENT

Authors:

Anastasiya Sivceva,

Mariya Akimova,

Petr Sharin,

Sofya Yakovleva,

Fedor Protopopov,

Vladilina Koryakina

The effect of thermal treatment on the composition of oxygen-containing functional groups in natural (NND) and detonation (DND) nanodiamonds was studied using FTIR spectroscopy and Boehm titration. It was found that annealing in air at 550 °C alters the ratio of hydroxyl and carbonyl groups, removes non-diamond carbon forms, and improves the ordering of the surface structure. The results are consistent with XPS data and confirm the effectiveness of thermal treatment for nanodiamond purification.

Keywords: functional groups, nanodiamonds, detonation synthesis, thermal treatment, surface structure, ftir spectroscopy