HETEROATOM-DOPED NANODIAMOND Russian patent published in 2024 - IPC C01B32/15 C01B32/26 B82Y40/00 

FIELD: nanotechnology.

SUBSTANCE: invention can be used in making probes for fluorescence imaging. Nanodiamond doped with at least one heteroatom selected from elements of group 14, phosphorus, nickel and boron, is characterized by BET specific surface area of 20–900 m²/g, average primary particle size of 2–70 nm and has a fluorescent emission peak originating from at least one heteroatom vacancy centre, the concentration of which is not less than 1 × 10¹⁰/cm³. Said nanodiamond contains, wt.%: carbon 70–99, hydrogen 0.1–5 and nitrogen 0.1–5 and can be additionally doped with phosphorus and/or boron. If the heteroatom includes silicon, the fluorescent emission peak of the doped nanodiamond is at wavelength 720–770 nm. If the heteroatom includes germanium, the fluorescent emission peak is at wavelength 580–630 nm. If the heteroatom contains tin, the fluorescent emission peak is at wavelength 590–650 nm. If the heteroatom contains lead, the fluorescent emission peak is located at wavelength 540–600 nm. Nanodiamond can have spherical, ellipsoidal or polyhedral shape. According to Raman spectroscopy, ratio (D/G) of diamond peak area (D) and peak area (G) of graphite is 0.2–9; ratio (H/D) of peak area (H) of surface hydroxyl group (OH) and peak area (D) of diamond is 0.1–5; and the ratio (C/D) of the peak area (C) of the surface carbonyl group (CO) and the peak area (D) of the diamond ranges from 0.01–1.5.

EFFECT: nanodiamond can contain at least one oxygen-containing and/or one hydrogen-containing terminal functional group.

12 cl, 2 tbl, 1 dwg, 12 ex