Surface peculiarities of detonation nanodiamonds in dependence of fabrication and purification methods

A variety of post-treatments, such as thermal annealing and liquid phase oxidation, were used to determine the surface properties of six blasting synthesized nanodiamond powders, produced by various purification conditions. Methods of FTIR-spectroscopy, oxidative titration and pH-measurement were applied for comparing the surface functional groups. All spectra exhibited the characteristic IR-bands of detonation diamond in the regions 3400–2700 cm − 1 and 1000–400 cm − 1. The differences were revealed by the dissimilarity of the bands in the region 2000–1000 cm − 1. The nanodiamond powder annealing up to 600 °C in air most fully revealed the specificity of the attached groups on diamond surface. The chemical oxidation with H 2O 2 modified nanodiamond surface groups and prevented them from further oxidative attack during thermal treatment.