Abstract
We report evidence in this letter for the encapsulation of Fe clusters supported by single crystal TiO2. After thermal annealing in ultrahigh vacuum (UHV) at 500–700 ° C for several hours, Fe clusters are almost completely covered by Ti suboxides TiOx while Fe remains mainly in the metallic state. The phenomenon can be clearly measured using LETS (low energy ion scattering) and XPS (X-ray photoelectron spectroscopy).
Keywords
Iron titanium dioxide ultrathin films SMSIPreview
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References
- [1]G.L. Haller and D.E. Resasco, Adv. Catal. 36 (1989) 173.Google Scholar
- [2]V.E. Henrich, Rep. Prog. Phys. 48 (1985) 1481.Google Scholar
- [3]S.J. Tauster, S.C. Fung and R.L. Garten, J. Am. Chem. Soc. 100 (1978) 170.Google Scholar
- [4]D.E. Resasco and G.L. Haller, J. Catal. 82 (1983) 279.Google Scholar
- [5]H.R. Sadeghi and V.E. Henrich, Appl. Surf. Sci. 19 (1984) 330.Google Scholar
- [6]B.J. Tatarchuk and J.A. Dumesic, J. Catal. 70 (1981) 335.Google Scholar
- [7]S. Takatani and Y.-W. Chung, J. Catal. 90 (1984) 75.Google Scholar
- [8]J.-M. Pan and T.E. Madey, J. Vac. Sci. Technol. A11 (4) (1993).Google Scholar
- [9]J.-M. Pan, B.L. Maschhoff, U. Diebold and T.E. Madey, J. Vac. Sci. Technol. A10 (4) (1992).Google Scholar
- [10]E. Taglauer, ed.,Ion Scattering Spectroscopy (Plenum Press, New York).Google Scholar
- [11]E. Taglauer and W. Heiland,Proc. 7th Int. Vac. Congr. and 3rd Int. Conf. Solid Surface, ed. R. Dobrozemsky (Vienna, 1977).Google Scholar
- [12]B.L. Maschhoff, J.-M. Pan and T.E. Madey, Surf. Sci. 259 (1991) 190.Google Scholar
- [13]S. Tougaard, Surf. Sci. 162 (1985) 875.Google Scholar
- [14]S.O. Saied, J.L. Sullivan, T. Choudhury and C.D. Pearce, Vacuum 38 (1988) 917.Google Scholar
- [15]W. Göpel, J.A. Anderson, D. Frankel, M. Jaehnig, K. Phillips, J.A. Schafer and G. Rocker, Surf. Sci. 139 (1984) 333.Google Scholar
- [16]J.-M. Pan, U. Diebold, L. Zhang and T.E. Madey, Surf. Sci., submitted.Google Scholar
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© J.C. Baltzer AG, Science Publishers 1993