Surface graphitization of ozone-treated detonation nanodiamonds

Jean-Charles Arnault (1) , Tristan Petit (2) , Hugues Girard (1) , Céline Gesset (1) , Mathilde Combis-Schlumberger (1) , Mohamed Sennour (3) , Alex Koscheev (4) , Andrei A. Khomich (5) , Olga Shenderova (6) , Igor Vlasov (5)

1 LCD-LIST - Laboratoire Capteurs Diamant
2 HZB - Helmholtz-Zentrum Berlin für Materialien und Energie GmbH
3 Mines Paris - PSL (École nationale supérieure des mines de Paris)
4 Karpov Institute of Physical Chemistry
5 GPI - A. M. Prokhorov General Physics Institute
6 International Technology Center

Bifunctional detonation nanodiamonds (NDs) were obtained by vacuum annealing at 750 °C of NDs previously oxidized in ozone (ND-ozone). Raman investigations demonstrate a significantly higher amount of sp2 carbon compared to ND with polyfunctional surface (ND-NRI) annealed in vacuum under the same conditions. In addition to sp2 carbon caps, thermal desorption mass spectroscopy analysis revealed a higher oxygen concentration at the ND-ozone surface with abundant carbonyl and carboxylic acid anhydride groups. The supernatant of ND-ozone annealed in vacuum exhibits a positive zeta potential (+50 mV at pH 6.5), while the starting sample has a high negative zeta potential (−60 mV). This supports the oxygen hole-doping model previously proposed to explain the positive zeta potential of NDs after vacuum annealing.

Mots clés: diamond; graphitization; surfaces; nanocrystals; ozone; reconstruction

Domaines: Sciences de l'ingénieur [physics]; Micro et nanotechnologies/Microélectronique; Sciences de l'ingénieur [physics]; Matériaux

Jean-Charles Arnault, Tristan Petit, Hugues Girard, Céline Gesset, Mathilde Combis-Schlumberger, et al.. Surface graphitization of ozone-treated detonation nanodiamonds. physica status solidi (a), 2014, 211 (12), pp.2739-2743. ⟨10.1002/pssa.201431397⟩. ⟨hal-01102477⟩