Interface atom mobility and charge transfer effects on CuO and Cu2O formation on Cu3Pd(111) and Cu3Pt(111)

Interface atom mobility and charge transfer effects on CuO and Cu2O formation on Cu3Pd(111) and Cu3Pt(111)

Blog Article

Abstract We bombarded $$mbox{$ ext{Cu}_{3} ext{Pd}(111)$}$$ Cu 3 Pd ( 111 ) and $$mbox{$ ext{Cu}_{3} ext{Pt}(111)$}$$ Cu 3 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 $$300, ext{K}$$ 300 K , CuO forms on both $$mbox{$ ext{Cu}_{3} ext{Pd}(111)$}$$ Cu 3 Pd ( 111 ) and $$mbox{$ ext{Cu}_{3} ext{Pt}(111)$}$$ Cu 3 Pt ( 111 ).When we increase the surface temperature to $$500, ext{K}$$ 500 Barriers K , $$mbox{$ ext{Cu}_{2} ext{O}$}$$ Cu 2 O also forms on $$mbox{$ ext{Cu}_{3} ext{Pd}(111)$}$$ Cu 3 Pd ( 111 ) , but not on $$mbox{$ ext{Cu}_{3} ext{Pt}(111)$}$$ Bun Pans Cu 3 Pt ( 111 ).

For comparison, $$mbox{$ ext{Cu}_{2} ext{O}$}$$ Cu 2 O forms even at $$300, ext{K}$$ 300 K on Cu(111).On $$mbox{$ ext{Cu}_{3} ext{Au}(111)$}$$ Cu 3 Au ( 111 ) , $$mbox{$ ext{Cu}_{2} ext{O}$}$$ Cu 2 O forms only after $$500, ext{K}$$ 500 K , and no oxides can be found at $$300, ext{K}$$ 300 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).