Interface atom mobility and charge transfer effects on CuO and Cu 2 O formation on Cu 3 Pd(111) and Cu 3 Pt(111)
2021
We bombarded $$\mbox{$\text{Cu}_{3}\text{Pd}(111)$}$$
and $$\mbox{$\text{Cu}_{3}\text{Pt}(111)$}$$
with a 2.3 eV hyperthermal oxygen molecular beam (HOMB) source, and characterized the corresponding (oxide) surfaces with synchrotron-radiation X-ray photoemission spectroscopy (SR-XPS). At $$300\,\text{K}$$
, CuO forms on both $$\mbox{$\text{Cu}_{3}\text{Pd}(111)$}$$
and $$\mbox{$\text{Cu}_{3}\text{Pt}(111)$}$$
. When we increase the surface temperature to $$500\,\text{K}$$
, $$\mbox{$\text{Cu}_{2}\text{O}$}$$
also forms on $$\mbox{$\text{Cu}_{3}\text{Pd}(111)$}$$
, but not on $$\mbox{$\text{Cu}_{3}\text{Pt}(111)$}$$
. For comparison, $$\mbox{$\text{Cu}_{2}\text{O}$}$$
forms even at $$300\,\text{K}$$
on Cu(111). On $$\mbox{$\text{Cu}_{3}\text{Au}(111)$}$$
, $$\mbox{$\text{Cu}_{2}\text{O}$}$$
forms only after $$500\,\text{K}$$
, and no oxides can be found at $$300\,\text{K}$$
. We ascribe this difference in Cu oxide formation to the mobility of the interfacial species (Cu/Pd/Pt) and charge transfer between the surface Cu oxides and subsurface species (Cu/Pd/Pt).
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