Surface chemical modifications and surface reactivity of nanodiamonds hydrogenated by CVD plasma

Jean-Charles Arnault (1) , Tristan Petit (1) , Hugues Girard (1) , Anthony Chavanne (1) , Céline Gesset (1) , Mohamed Sennour (2) , Marc Chaigneau (3)

1 LIST (CEA) - Laboratoire d'Intégration des Systèmes et des Technologies
2 CDM - Centre des Matériaux
3 LPICM - Laboratoire de physique des interfaces et des couches minces [Palaiseau]

The present study focuses on the interaction of hydrogen microwave CVD plasma with nanodiamonds (NDs). Hydrogen treated NDs (H-NDs) were characterized using electron spectroscopies (XPS, AES) without air exposure. A surface temperature higher than 700 °C is needed to remove the oxygen present on raw NDs. The kinetics of oxygen removal were investigated. Moreover, UHV annealings of H-NDs after ageing in ambient air clearly underline that 75% of the oxygen is related to physisorbed species. Finally, H-NDs were efficiently grafted using photochemical reaction with alkenes and a spontaneous coupling of aryldiazonium salts. These results confirm similar electronic surface properties between bulk and nano diamond materials.

Domaines: Physique [physics]; Matière Condensée [cond-mat]; Science des matériaux [cond-mat.mtrl-sci]

Jean-Charles Arnault, Tristan Petit, Hugues Girard, Anthony Chavanne, Céline Gesset, et al.. Surface chemical modifications and surface reactivity of nanodiamonds hydrogenated by CVD plasma . Physical Chemistry Chemical Physics, 2011, 13, pp.11481-11487. ⟨10.1039/C1CP20109C⟩. ⟨hal-01271867⟩