Premium
Dissociative adsorption of molecular deuterium on polycrystalline diamond films activated by medium surface temperature
Author(s) -
Michaelson Shaul,
Berkovitz Tiran,
Akhvlediani Roza,
Hoffman Alon
Publication year - 2014
Publication title -
physica status solidi (a)
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.532
H-Index - 104
eISSN - 1862-6319
pISSN - 1862-6300
DOI - 10.1002/pssa.201431165
Subject(s) - crystallite , deuterium , adsorption , diamond , electron energy loss spectroscopy , analytical chemistry (journal) , high resolution electron energy loss spectroscopy , annealing (glass) , materials science , dissociation (chemistry) , material properties of diamond , chemistry , crystallography , nanotechnology , atomic physics , organic chemistry , composite material , transmission electron microscopy , physics
In this work we report on an investigation of thermally induced dissociative adsorption of molecular deuterium onto hydrogenated and bare polycrystalline diamond film surfaces studied by high resolution electron energy loss spectroscopy (HR‐EELS). Hydrogenated diamond films (grown from CH 4 and H 2 gases) were heated at various temperatures in molecular D 2 ambient at 5 × 10 −6 Torr and then studied by HR‐EELS. This study clearly shows the formation of C–D bonding on hydrogenated polycrystalline diamond surface and gradual disappearance of C–H mode as a function of annealing temperature. The C–D bonding configurations and thermal stability of adsorbed deuterium resulting from dissociate adsorption were compared to those occurring on deuterated diamond films (grown from CD 4 and D 2 gases). We report and assign at least three contributions to C–D stretching HR‐EELS mode associated to (111), (100) crystallographic orientations as well as grain boundary associated vibrations in accordance with similar vibrations of C–H stretching vibrations, reported previously.