METHOD OF PRODUCING CUBIC NANOCRYSTALS OF DIAMOND Russian patent published in 2015 - IPC C01B31/06 B82B1/00 B82Y10/00 B82Y15/00 B82Y40/00 C30B29/04 

FIELD: nanotechnology.

SUBSTANCE: invention relates to nanotechnology and can be used for labelling molecules, quantum information processing, magnetometry, and synthesis of diamond by chemical vapour deposition. Crystalline diamond powder with a maximum particle size of 2 microns to 1 mm is ground by the nitrogen jet for 1-5 hours with the grinding pressure of 500 kPa to obtain the fine powder which is then milled in a planetary mill with balls of tungsten carbide. The resulting nano-ground powder is autoclaved with the mixture of hydrofluoric acid and nitric acid at a temperature of 100-200°C. The fluorescent cubic nanocrystals of diamond of predominantly circular shape are recovered by centrifugation, with a maximum size of not more than 100 nm, comprising up to 2,000 ppm alloy addition, such as nitrogen, and up to 50 ppm of impurities. The surface of the diamond nanocrystal comprises a layer of amorphous carbon.

EFFECT: obtaining diamond nanocrystals.

15 cl, 8 dwg