Hydroxylation and self-assembly of colloidal hydrogenated nanodiamonds by aqueous oxygen radicals from atmospheric pressure plasma jet

0499824 - FZÚ 2019 RIV GB eng J - Journal Article
Jirásek, Vít - Stehlík, Štěpán - Štenclová, Pavla - Artemenko, Anna - Rezek, Bohuslav - Kromka, Alexander
Hydroxylation and self-assembly of colloidal hydrogenated nanodiamonds by aqueous oxygen radicals from atmospheric pressure plasma jet.
RSC Advances. Roč. 8, č. 66 (2018), s. 37681-37692. E-ISSN 2046-2069
R&D Projects: GA ČR(CZ) GJ18-11711Y; GA MŠMT EF16_019/0000760; GA MZd(CZ) NV15-33018A
Grant - others:OP VVV - SOLID21(XE) CZ.02.1.01/0.0/0.0/16_019/0000760
Institutional support: RVO:68378271
Keywords : self-assembly * plasma jet * APPJ * oxygen atoms * nanodiamonds
OECD category: Condensed matter physics (including formerly solid state physics, supercond.)
Impact factor: 3.049, year: 2018

Plasma chemical modification of nanoparticles in gas-liquid type reactors enables controllable, specific, low-cost, and environmentally friendly alternative to other treatments. Here the atmospheric pressure radio-frequency microplasma jet (μ-APPJ) operating with 0.6% O2 in He is used to deliver aqueous oxygen radicals (AOR) to ~3 nm hydrogenated detonation nanodiamonds (H-DNDs) suspended in water. The main reaction mechanism is identified as the abstraction of surface hydrogen atoms by O or OH radicals and a consequent attachment of the OH group, thereby increasing concentration of alcohols, carboxyls, and aldehydes on the DND’s surface. FTIR spectra reveal also a structural re-arrangement of the surface water on the AOR-treated H-DNDs. Yet zeta-potential of AOR-treated H-DNDs still remains positive (decreases from +45 mV to +30 mV). The chemical modification gives rise to formation of nanoscale chain-like aggregates when AOR-treated H-DNDs are deposited on Si substrate.

Permanent Link: http://hdl.handle.net/11104/0292017