Keyword: «sp²/sp³ states»

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.