Epitaxial Growth of Ru and Pt on Pt(111) and Ru(0001), Respectively: A Combined AES and RHEED Study

Figure 4

(a) LEED (66 eV) and (b) the RHEED ([112] azimuth) patterns for an Ru-deposited Pt(111) electrode surface (0.25 ML); the RHEED patterns (c) ([110]) and (d) ([112]) for an Ru-deposit modified Pt(111) electrode surface with the Ru coverage of 0.64, showing intensity modulation and satellite reflections besides the Pt substrate reflections; (e) the RHEED pattern ([−211]) obtained at another position of the electrode surface, where both the Pt- and satellite-reflections are clearly resolvable at the first- and zero-Laue zones; the RHEED patterns (f) ([−110]) and (g) ([−211]) for an Ru-modified Pt(111) electrode surface with ~1 ML coverage.

(a)

(b)

(c)

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(e)

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(g)