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Surface graphitization of ozone-treated detonation nanodiamonds
Abstract : 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.
Littérature citée [15 références]
https://hal-mines-paristech.archives-ouvertes.fr/hal-01102477
Contributeur : Bibliothèque Umr7633 <>
Soumis le : vendredi 17 mai 2019 - 17:01:26
Dernière modification le : jeudi 24 septembre 2020 - 16:00:38
Archivage à long terme le : : mercredi 9 octobre 2019 - 13:05:13
Contributeur : Bibliothèque Umr7633 <>
Soumis le : vendredi 17 mai 2019 - 17:01:26
Dernière modification le : jeudi 24 septembre 2020 - 16:00:38
Archivage à long terme le : : mercredi 9 octobre 2019 - 13:05:13
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