Solid State NMR study of nanodiamond surface chemistry

• Published in: Solid state nuclear magnetic resonance 2011-11, Vol.40 (4), p.144-154
• Main Authors: Dubois, Marc, Guérin, Katia, Batisse, Nicolas, Petit, Elodie, Hamwi, André, Komatsu, Naoki, Kharbache, Hayat, Pirotte, Pascal, Masin, Francis
• Format: Article
• Language: English
• Subjects: Chemical bonds; Density; Electron paramagnetic resonance; Fluorination; Nanodiamond; Nanomaterials; Nanostructure; Nuclear magnetic resonance; Solid state; Surface chemistry
• ISSN: 0926-2040; 1527-3326
• DOI: 10.1016/j.ssnmr.2011.10.003

Solid state NMR measurements using 13C, 1H and 19F nuclei (MAS, CP-MAS) underline the surface chemistry of nanodiamonds from different synthesis (detonation, high pressure high temperature and shock compression). The comparison of the spin-lattice relaxation times T 1 and physicochemical characterization (spin densities of dangling bonds, specific surface area and Raman and infrared spectroscopies) for the various samples, as synthesized, chemically purified and fluorinated allows the nature and the location of the various groups, mainly C–OH, C–H and C–F to be investigated. C–OH groups are located only on the surface whereas C–H and dangling bonds seem to be distributed in the whole volume. Fluorination was studied as a chemical treatment for purification and change of the hydrophobicity through the conversion of the C–OH groups into covalent C–F bonds. [Display omitted] ► Solid state NMR study of various nanodiamonds produced by different methods. ► Study of the various surface groups. ► Surface chemical modification of nanodiamonds, hydrogenation, fluorination. ► Localization of the defects (dangling bonds, C–OH, CH, C–F).