Electrical and colloidal properties of hydrogenated nanodiamonds: Effects of structure, composition and size

0585214 - FZÚ 2025 RIV NL eng J - Journal Article
Stehlík, Štěpán - Szabó, Ondrej - Shagieva, Ekaterina - Miliaieva, Daria - Kromka, Alexander - Němečková, Zuzana - Henych, Jiří - Kozempel, J. - Ekimov, E. - Rezek, B.
Electrical and colloidal properties of hydrogenated nanodiamonds: Effects of structure, composition and size.
Carbon Trends. Roč. 14, Mar (2024), č. článku 100327. E-ISSN 2667-0569
R&D Projects: GA MŠMT(CZ) LM2023066; GA MŠMT LM2023051
Research Infrastructure: CzechNanoLab II - 90251
Institutional support: RVO:68378271 ; RVO:61388980
Keywords : nanodiamond * hydrogenation * positive zeta potential * conductivity * FTIR
OECD category: Nano-materials (production and properties); Inorganic and nuclear chemistry (UACH-T)
Method of publishing: Open access

This study shows how the ND synthesis process and ND size are reflected in their different colloidal/hydration and electronic properties. We employ three different ND types: detonation ND (DND), topdown high-pressure high-temperature ND (TD_HPHT ND) prepared by milling of HPHT monocrystals, and bottom-up high-pressure high-temperature ND (BU_HPHT ND) prepared by HPHT synthesis from chloroadamantane. Zeta potential measurements and Fourier transform infrared spectroscopy analysis (FTIR) reveal the best colloidal stability in neutral to basic pH and the strongest affinity to water for DND. Electrical and FTIR measurements connected with an annealing treatment show a steep increase of electrical conductivity in BU_HPHT ND above 2 nm and reveal different contribution of transfer doping in BU_HPHT ND and TD_HPHT ND despite similar conductivity values. We also confirm the correlation of the ND conductivity with IR transmission at the phonon frequency of the diamond.
Permanent Link: https://hdl.handle.net/11104/0352975