New insights into the reactivity of detonation nanodiamonds during the first stages of graphitization

Florent Ducrozet (1) , Hugues Girard (1) , Jocelyne Leroy (2) , Eric Larquet (3) , Ileana Florea (4) , Emilie Brun (5) , Cécile Sicard-Roselli (5) , Jean-Charles Arnault (1)

1 LEDNA - Laboratoire Edifices Nanométriques
2 LICSEN UMR 3685 - Laboratoire Innovation en Chimie des Surfaces et NanoSciences
3 LPMC - Laboratoire de physique de la matière condensée
4 LPICM - Laboratoire de physique des interfaces et des couches minces [Palaiseau]
5 ICP - Institut de Chimie Physique

The present study aims to compare the early stages of graphitization of the same DND source for two annealing atmospheres (primary vacuum, argon at atmospheric pressure) in an identical set-up. DND samples are finely characterized by a combination of complementary techniques (FTIR, Raman, XPS, HR-TEM) to highlight the induced modifications for temperature up to 1100 °C. The annealing atmosphere has a significant impact on the graphitization kinetics with a higher fraction of sp$^2$-C formed under vacuum compared to argon for the same temperature. Whatever the annealing atmosphere, carbon hydrogen bonds are created at the DND surface during annealing according to FTIR. A “nano effect”, specific to the < 10 nm size of DND, exalts the extreme surface chemistry in XPS analysis. According to HR-TEM images, the graphitization is limited to the first outer shell even for DND annealed at 1100 °C under vacuum

Mots clés: nanodiamonds; surface graphitization; X-ray photoelectron spectroscopy

Domaines: Matériaux

Florent Ducrozet, Hugues Girard, Jocelyne Leroy, Eric Larquet, Ileana Florea, et al.. New insights into the reactivity of detonation nanodiamonds during the first stages of graphitization. Nanomaterials, 2021, 11 (10), pp.2671. ⟨10.3390/nano11102671⟩. ⟨cea-03379043⟩