Energy dependence of methyl-radical adsorption on diamond (001)-(2×1) surface

Huang, Z., Pan, Z.Y., Zhu, W.J., Wang, Y.X., & Du, A.J. (2001) Energy dependence of methyl-radical adsorption on diamond (001)-(2×1) surface. Surface & Coatings Technology, 141(2-3), pp. 246-251.

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Abstract

The deposition of hyperthermal CH3 on diamond (001)-(2×1) surface at room temperature has been studied by means of molecular dynamics simulation using the many-body hydrocarbon potential. The energy threshold effect has been observed. That is, with fixed collision geometry, chemisorption can occur only when the incident energy of CH3 is above a critical value (Eth). Increasing the incident energy, dissociation of hydrogen atoms from the incident molecule was observed. The chemisorption probability of CH3 as a function of its incident energy was calculated and compared with that of C2H2. We found that below 10 eV, the chemisorption probability of C2H2 is much lower than that of CH3 on the same surface. The interesting thing is that it is even lower than that of CH3 on a hydrogen covered surface at the same impact energy. It indicates that the reactive CH3 molecule is the more important species than C2H2 in diamond synthesis at low energy, which is in good agreement with the experimental observation.

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ID Code: 61178
Item Type: Journal Article
Refereed: Yes
Keywords: Growth models; Molecular dynamics simulation; Impact test; Methane; Diamond; Energetic molecular deposition
DOI: 10.1016/S0257-8972(01)01262-2
ISSN: 0257-8972
Divisions: Current > Schools > School of Chemistry, Physics & Mechanical Engineering
Current > QUT Faculties and Divisions > Science & Engineering Faculty
Deposited On: 08 Jul 2013 02:56
Last Modified: 08 Jul 2013 02:56

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