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The Analysis of Vapor-Deposited Pd Particles Supported on Thin Oxides

  • Helmut Poppa (a1), F. Rumpf (a2), R. D. Moorhead (a3) and C. Henry (a2)


Problems of analyzing by TEM and TPD (Temperature Programmed Desorption) the structure and micromorphology of small Pd particles vapor deposited in UHV onto clean oxide supports are discussed. Particle changes induced during extended exposures to high intensity electron irradiation of a number of electron transparent support materials such as Al2O3, SiO2, TiO2, MgO, and mica are examined. Different damage mechanisms are evaluated and experimental means of reducing the damage are explored. The possibility of extracting particle morphology information from a detailed analysis of CO thermal desorption spectra is also investigated. Evidence suggests that it may be possible to obtain micromorphology information down to very small particle sizes from TPD measurements if the effects of intrinsic particle morphology can be separated from the influence of diffusion of support species.



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1. Poppa, H., Vacuum 34,1081 (1984).
2. Poppa, H., Ultramicroscopy 11, 105 (1983).
3. Poppa, H., Moorhead, R.D., Heinemann, K., Thin Solid Films 128, 251 (1985).
4. Hobbs, L.W., Ultramicroscopy 23, 339 (1987).
5. Egerton, R.F., Ultramicroscopy 23, 305 (1987).
6. Low-T TEM provided by DrMardingly, J., Lockheed Research Laboratories, Sunnyvale, California.
7. Heinemann, K., Poppa, H., J. Vac. Sci. Techn. A4, 127 (1986).
8. Yacaman, M.J., Heinemann, K., Poppa, H., CRC Critical Rev. Sol. State Mat. 10, 243 (1983).
9. Datye, A.K., MRS National Symposium, Boston, December 1987; L.D. Schmidt, MRS National Symposium, Boston, December 1987.
10. Hulse, J., Kuppers, J., Wandelt, K., Ertl, G., Surf. Sci. 6, 453 (1980).
11. Takasu, Y., Unwin, R., Tesche, B., Bradshaw, A.M., Grunze, M., Surf. Sci. 77, 219 (1978).
12. Thomas, M., Dickinson, J.T., Poppa, H., Pound, G.M., J. Vac. Sci. Techn. 15, 568 (1978).
13. Doering, D.L., Poppa, H., Dickinson, J.T., J. Vac. Sci. Techn. 17, 198 (1980).
14. Koch, R., Browning, R., to be published.
15. Drechsler, M., Surface Mobilities on Solid Materials, edited by Binh, V. Thien, NATO Advanced Study Institute (Plenum Press, New York/London 1981), p. 405.
16. Heyraud, J.C., Metois, J.J., J. Cryst. Growth 50, 571 (1980).
17. Wang, T., Lee, C., Schmidt, L.D., Surf. Sci. 163, 181 (1985).
18. Park, C., Durrer, W.G., Poppa, H., Dickinson, J.T., J. Catalysis 95, 361 (1985).
19. Doering, D.L., Poppa, H., Dickinson, J.T., J. Catalysis 73, 104 (1982).
20. Durrer, W.G., Poppa, H., Dickinson, J.T., Park, C., J. Vac. Sci. Techn. A 3, 1545 (1985).
21. Gillet, E., Channakhone, S., Matolin, V., J. Catal. 97, 437 (1986).
22. Altman, E.I., Gorte, R.J., Surf. Sci. 172, 71 (1986).
23. Koch, R., Poppa, H., JVST A (5), 1845 (1987).
24. Kiskinova, M.P., Bliznakov, G.M., Surf. Sci. 123, 61 (1982).
25. Koch, R., Poppa, H., Thin Solid Films 151, 365 (1987).
26. Koch, R., to be published.
27. Van Hardeveld, R., Hartog, F., Surf. Sci. 15, 189 (1969).
28. Henry, C.R., Poppa, H., Proc. AVS National Symposium, Anaheim/California, Novevember 1987, to be published.
29. Micrograph acquired at the National Facility for Electron Microscopy, Univeristy of California, Berkeley, California.

The Analysis of Vapor-Deposited Pd Particles Supported on Thin Oxides

  • Helmut Poppa (a1), F. Rumpf (a2), R. D. Moorhead (a3) and C. Henry (a2)


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