A surface reaction with atoms: Hydrogenation of sp- and sp2-hybridized carbon by thermal H(D) atoms
- 15 August 1993
- journal article
- research article
- Published by AIP Publishing in The Journal of Chemical Physics
- Vol. 99 (4), 3125-3128
- https://doi.org/10.1063/1.465166
Abstract
Hydrogen containing carbon (C:H) films have been prepared by ion beam deposition of 160 eV ethane ions on a carrier consisting of a Pt(111) single crystalsurface covered with a monolayer of graphite. Several monolayers thick filmsdeposited at 350 K contain hydrogen bound to sp, sp 2, and sp 3 hybridized carbon.Vibrational spectroscopy reveals that thermal D(H) atoms directed to the C:H filmsurface hydrogenate unsaturated CH groups at the surface and transform sp and sp 2 hybridized carbon to sp 3. The observed reaction mechanism explains the microscopic processes in chemical erosion of graphite by hydrogen atoms which is a crucial reaction step in the low pressure synthesis of diamondlike carbon.Keywords
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