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Article Dans Une Revue Nanoscale Année : 2013

Surface transfer doping can mediate both colloidal stability and self-assembly of nanodiamonds

Résumé

Although undoped diamond is insulating, hydrogenated bulk diamond surfaces exhibit surface conductivity under air and are electrochemically active in aqueous solutions. Due to their large surface/volume ratio, similar surface effects may exhibit a dramatic impact on the properties of nanodiamonds. Here we show that plasma-hydrogenated detonation nanodiamonds (NDs-H) display a positive zeta potential in water due to charge transfer with a redox couple involving oxygen in water. The transfer doping of NDs-H in water can be modulated by pH. Surprisingly, after acid addition, strong Coulomb coupling between NDs-H and adsorbed counterions induces the self-assembly of NDs-H into organized macro-structures reaching millimeter scale.
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hal-00964990 , version 1 (29-06-2019)

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Tristan Petit, Hugues Girard, Adeline Trouvé, I. Batonneau-Gener, P. Bergonzo, et al.. Surface transfer doping can mediate both colloidal stability and self-assembly of nanodiamonds. Nanoscale, 2013, 5 (19), pp.8958-8962. ⟨10.1039/c3nr02492j⟩. ⟨hal-00964990⟩
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