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 H2O2 modified nanodiamond surface groups and prevented them from further oxidative attack during thermal treatment.