Skip to main content Accessibility help
×
Home

Effect of Oxygen Pressure on the Initial Oxidation Behavior of Cu and Cu-Au Alloys

  • Langli Luo (a1), Yihong Kang (a2), Zhenyu Liu (a2), Judith C Yang (a2) and Guangwen Zhou (a1)...

Abstract

A wide information gap exists between our present atomic-scale knowledge of metal oxidation derived from conventional ultrahigh vacuum (UHV) surface science experiments and the oxidation mechanisms obtained from the growth of bulk oxide thin films under technologically relevant realistic (or near-) atmospheric conditions. To bridge this pressure gap, we present an in-situ transmission electron microscopy (TEM) study of the initial oxidation stage of Cu(100) and Cu-Au(100) surfaces where the oxygen partial pressure varies from 5x10-4 to 150 Torr. For Cu(100), with increasing oxygen partial pressure (pO2), the nucleation density of the oxide islands increases and so does the growth rate of the oxide islands. As the pO2 continues to increase, a transition from epitaxial cube-on-cube Cu2O islands to randomly oriented oxide islands is observed. A kinetic model based on the classic heterogeneous nucleation theory is developed to explain the effect of oxygen partial pressure on the oxide orientation. It is shown that such a transition in the oxide nucleation orientation is related to the effect of oxygen pressure on the nucleation barrier and atom collision rate. The Cu-Au(111) alloy revealed the same oxygen pressure dependency of the oxide nucleation orientation as pure Cu oxidation.

Copyright

References

Hide All
1. Lundgren, E., Gustafson, J., Mikkelsen, A., Andersen, J. N., Stierle, A., Dosch, H., Todorova, M., Rogal, J., Reuter, K., and Scheffler, M., Phys. Rev. Lett. 92, 046101 (2004).
2. Eastman, J. A., Fuss, P. H., Rehn, L. E., Baldo, P. M., Zhou, G. W., Fong, D. D., and Thompson, L. J., Appl. Phys. Lett. 87, 051914 (2005).
3. Lahtonen, K., Hirsimaki, M., Lampimaki, M., and Valden, M., The Journal of Chemical Physics 129, 124703 (2008).
4. Lyubinetsky, I., Thevuthasan, S., McCready, D. E., and Baer, D. R., Journal of Applied Physics 94, 7926 (2003).
5. Zhou, G. W., Phys. Rev. B 81, 195440 (2010).
6. Zhou, G. W., Yang, J. C., Physical Review Letters 89, 106101 (2002).
7. Zhou, G. W., Yang, J. C., Applied Surface Science 210/3–4, 165 (2003).
8. Zhou, G. W., Yang, J. C., Surface Science 531/3, 359 (2003).
9. Zhou, G. W., Yang, J. C., Applied Surface Science 222, 357364 (2004).
10. Zhou, G. W., Yang, J. C., Surface Science 559/2–3, 100110 (2004).
11. Luo, Langli, Kang, Yihong, Liu, Zhenyu, Yang, Judith C, and Zhou, Guangwen, Phys. Rev. B, Accepted on March 2nd, 2011
12. Gaskell, D. R., “Introduction to Metallurgical Thermodynamics” (Scripta, Washington, D.C., 1973).

Keywords

Effect of Oxygen Pressure on the Initial Oxidation Behavior of Cu and Cu-Au Alloys

  • Langli Luo (a1), Yihong Kang (a2), Zhenyu Liu (a2), Judith C Yang (a2) and Guangwen Zhou (a1)...

Metrics

Full text views

Total number of HTML views: 0
Total number of PDF views: 0 *
Loading metrics...

Abstract views

Total abstract views: 0 *
Loading metrics...

* Views captured on Cambridge Core between <date>. This data will be updated every 24 hours.

Usage data cannot currently be displayed.