Interactions of hydrogen and methyl radicals with diamond C(111) studied by sum-frequency vibrational spectroscopy
- Department of Physics, University of California, Berkeley, California 94720 (United States)
- Institute of Atomic and Molecular Sciences, Academia Sinica, P.O. Box 23-166, Taipei (Taiwan)
- IBM Almaden Research Center, 650 Harry Road, San Jose, California 95120-6099 (United States)
Methyl-radical and atomic hydrogen adsorption on C(111) have been studied by infrared-visible sum-frequency vibrational spectroscopy. Methyl iodide, di-tert-butyl-peroxide, and methane passing through a hot filament are used to produce methyl radicals (CH{sub 3}). Low-energy CH{sub 3} from pyrolytic dissociation at {approximately}800{degree}C adsorb intact on the surface, but with surface annealing above 350{degree}C, convert to tetrahedrally bonded CH. High-energy CH{sub 3} produced at {approximately}1800{degree}C convert readily to CH upon adsorption. Co-dosing a high-temperature ({approximately}800{degree}C) C(111) substrate with hydrogen and methane via a hot filament at {approximately}1800{degree}C yields only the stable tetrahedrally-bonded CH-species on the surface. They appear to stabilize the diamond surface structure. The coverage is not full, leaving sites open for CH{sub 3} to adsorb and convert to CH as is necessary for chemical vapor deposition diamond growth. {copyright} {ital 1996 The American Physical Society.}
- Research Organization:
- Lawrence Berkeley National Laboratory
- DOE Contract Number:
- AC03-76SF00098
- OSTI ID:
- 383818
- Journal Information:
- Physical Review, B: Condensed Matter, Journal Name: Physical Review, B: Condensed Matter Journal Issue: 11 Vol. 54; ISSN PRBMDO; ISSN 0163-1829
- Country of Publication:
- United States
- Language:
- English
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