Premium
Low‐Temperature hydrogenation of diamond nanoparticles using diffuse coplanar surface barrier discharge at atmospheric pressure
Author(s) -
Kromka Alexander,
Čech Jan,
Kozak Halyna,
Artemenko Anna,
Ižák Tibor,
Čermák Jan,
Rezek Bohuslav,
Černák Mirko
Publication year - 2015
Publication title -
physica status solidi (b)
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.51
H-Index - 109
eISSN - 1521-3951
pISSN - 0370-1972
DOI - 10.1002/pssb.201552232
Subject(s) - annealing (glass) , materials science , diamond , hydrogen , atmospheric pressure , plasma , nanoparticle , analytical chemistry (journal) , atmospheric pressure plasma , atmospheric temperature range , chemical engineering , chemistry , nanotechnology , composite material , organic chemistry , oceanography , physics , quantum mechanics , engineering , geology , meteorology
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 5 nm were annealed (oxidized) in air at 450 °C for 30 min 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 3.1 W/cm 2 . While infrared spectra of annealed DNPs were dominated by oxygen containing functional groups, plasma‐hydrogenated DNPs revealed increase of bands of CH stretching vibrations in the region of 2800–3000 cm −1 with only 5 min of plasma treatment. Prolonged plasma treatments up to 60 min resulted in the increase of CH stretching vibrations and a decrease of COC groups in the spectral region of 1000–1300 cm −1 .