Optical properties of the surface of detonation nanodiamonds

In this work, the surface properties of samples of a detonation nanodiamond suspension produced by JSC Federal Research and Production Center “Altai”, Biysk, Russia, were investigated. The samples of the detonation nanodiamond suspension were purified from the non-diamond carbon phase by thermal annealing at 500 °C, which led to the disappearance of the bands of sp2-hybridized carbon (graphene) at 1362 and 1586 cnr1, an increase in the band of sp3-hybridized carbon (nanodiamond) at 1320 cmN and the appearance of bands of sp3-hybridized amorphous carbon at 1265 and 1552 cm~h as well as a band of oxygen-containing functional groups at 1065 cm~i in the Raman spectra. The samples of the detonation nanodiamond suspension were fractionated by sedimentation and centrifugation. Using centrifugation, it was possible to isolate fractions of detonation nanodiamonds with sizes up to 20 nm and up to 60 nm. It should be noted that detonation nanodiamonds with sizes up to 20 nm have a high potential for use in biomedical technologies as carriers of functional groups and as photoluminescent nanoparticles. At the same time, it is necessary to be able to perform not only fractionation by nanoparticle size, but also fractionation by photoluminescence properties and by the content of specific diamond color centers (NVy №V°, etc.), including at the single-particle level. Based on such diamond nanoparticles, elements for photonic integrated circuits, contrast agents for magnetic resonance imaging, probes for atomic force microscopy, single-photon sources, and three-dimensional photonic crystals (diamond opals) are being developed. The authors declare no conflicts of interests.

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