Nanostructured surfaces

Structure and optical properties of CNx–Diamond core/shell nanostructured
Pas’ko M.I.1, Prudnikov А.M.2, Fesenko O.2, Pashkevich Yu.G.2, Lamonova K.V.2
1 Department of medical physics and information technology,Donetsk National Medical University named after M.Gorky, Lyman 84404, 27 Pryvokzalnaya Str., Ukraine
E-mail: paskomariia@gmail.com
2 Department of high pressure and advanced technology O.O.Galkin Donetsk Institute for Physics and Engineering NAS of Ukraine, Kyiv 03680, Nauki ave. 46, Ukraine

The hybrid luminescent nanodiamond materials with phosphors formed in them exhibit unique physical properties and have been intensively studied recently also [1]. 
The report presents the results of a study of the properties of diamond-like carbon nitride doped with ultradisperse diamond synthesized in a supercritical fluid. The process of supercritical treatment takes place in an autoclave at pressures of 20-100 MPa and a temperature of 200-530 °C. As solvents isopropyl alcohol, water and an aqueous solution of ammonia were used. After processing in a supercritical fluid, a crystalline transparent nanocomposite based on fullerene-like carbon nitride and ultradisperse diamond has been obtained.
Analysis of the Raman scattering spectra showed that the spectra consist of the bands with maxima at 1270, 1332, 1490, 1580 cm-1. The band (D) 1332cm-1 corresponds to the transverse TO-phonon of F2g symmetry and indicates the presence of a crystalline diamond phase (sp3-hybridized carbon). The band 1580 cm-1 is due to the presence of sp2-hybridized carbon and is typical for disordered graphite. The two bands at 1270 and 1490cm-1 are related to the presence of diamond particles. It turned out that the line associated with sp2-hybridized carbon, is less intensive with respect to the diamond lines. 
The obtained results demonstrate the great advantages of using a subcritical fluid in the development of hybrid nanodiamond materials.

1.	Janin Aharonovich I., Greentree A. D., Prawer S. Diamond photonics // Nature Photon. – 2011. – vol.5. – P.397–405.