Kromka A.,Institute of PhysicsAcademy of science of the Czech RepublicCukrovarnicka 10162 00 Prague 6Czech Republic |
Cech J.,Regional R and nter for Low Cost Plasma and Nanotechnology Surface ModificationsMasaryk UniversityKotlarska 2611 37 BrnoCzech Republic |
Kozak H.,Institute of PhysicsAcademy of science of the Czech RepublicCukrovarnicka 10162 00 Prague 6Czech Republic |
Artemenko A.,Institute of PhysicsAcademy of science of the Czech RepublicCukrovarnicka 10162 00 Prague 6Czech Republic |
And 4 more authors.
Physica Status Solidi (B) Basic Research
Due to an extraordinary combination of intrinsic properties of diamond nanoparticles (DNPs), there is an increased demand for their usage in various areas. While a broad range of surface termination is often done by wet-chemical, UV-irradiation or plasma treatments, DNPs hydrogenation is still an open issue. Thermal annealing or microwave plasma treatment, both known as high-temperature processes, do not offer satisfactory solutions for DNPs hydrogenation. Here, we report on a new approach for plasma-assisted DNPs hydrogenation at temperatures below 100°C. As-received detonation DNPs with size about 5nm were annealed (oxidized) in air at 450°C for 30min to reduce non-diamond carbon content. Then the annealed DNPs were plasma treated using atmospheric-pressure diffuse coplanar surface barrier discharge in pure hydrogen at powers densities of 1.8 and 3.1W/cm2. While infrared spectra of annealed DNPs were dominated by oxygen containing functional groups, plasma-hydrogenated DNPs revealed increase of bands of C-H stretching vibrations in the region of 2800-3000cm-1 with only 5min of plasma treatment. Prolonged plasma treatments up to 60min resulted in the increase of C-H stretching vibrations and a decrease of C-O-C groups in the spectral region of 1000-1300cm-1. © 2015 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim. Source