Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
9595198 | Surface Science | 2005 | 7 Pages |
Abstract
As an important surfactant, Pb surface alloying in surfactant-assisted epitaxy growth was studied by synchrotron radiation photoemission. As annealing causes the submonolayer Pb, distributed as two-dimensional islands on Cu(1Â 1Â 1), to form Pb-Cu surface alloy, Cu growth is also found to activate the Pb-Cu surface alloy formation on submonolayer Pb covered Cu(1Â 1Â 1). Whereas, different from the fact that the Pb-Cu surface alloy is replaced by a Pb overlayer when the Pb coverage increases up to 1.0Â ML, Co deposition gives rise to the Pb-Co surface alloy even on the 1.0Â ML Pb covered Cu(1Â 1Â 1) surface. In the Pb-Cu surface alloy the Pb 5d core level is shifted toward Fermi level by about 20Â meV. Heating de-alloys the Pb-Co surface alloy, while the interface intermixture between Co film and Cu substrate is also enhanced at the same time.
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Authors
M.C. Xu, H.J. Qian, F.Q. Liu, K. Ibrahim, W.Y. Lai, H.J. Gao,