An STM study of growth and alloying of Cr on Ru(0001) and CO adsorption on the alloy

Characterization and Chemical Properties of Pd−Au Alloy Surfaces†

“…However, a decrease of more than two-thirds is observed, indicating that the probability of CO adsorption on Au decreases substantially on the Pd−Au alloy surface. The preference of CO adsorption for isolated metal sites in bimetallic alloy systems has been observed previously. − For instance, for the Pt−Co alloy system with STM, Gauthier et al found CO to adsorb exclusively on top of the Pt sites . Also the IRAS study from Rutten et al suggested that CO adsorption at atop Rh sites was preferred over Pt atop sites on a Pt 0.25 Rh 0.75 single-crystal surface, even though the CO adsorption heats for Pt(111) and Rh(111) surfaces are very close .…”

Spin-polarized scanning tunneling microscopy and spectroscopy study of chromium on a Cr(001) surface

“…The presence of an oxygen peak (O KLL = 510 eV) can only be detected as a shoulder of the Cr LMM peak and is therefore rather difficult to quantify. Furthermore, the segregation of oxygen has been demonstrated to occur at temperatures above 700 • C and we can therefore expect a small amount of this element as segregant [13]. The presence of S, C and N is observed in both samples but with higher concentration in Cr/Cr(001).…”

“…Chromium islands have been successfully obtained by epitaxial growth on several surfaces. For example, Cr islands with sizes ranging from 2 to 30 nm have been created on Cr(001) [10], Au(001) [11], Ir(111) [12], Ru(0001) [13] and W(110) [14]. Conventional STM and SP-STM measurements have shown that the crystal and magnetic structures of these Cr films are deeply influenced by the nature of the substrate.…”

Monolayer bimetallic surfaces: Experimental and theoretical studies of trends in electronic and chemical properties

“…Hager et al [125] noticed a similar strong coupling for the Cu/Ru(0001) surface while examining PdCu surface alloys on Ru(0001). Engelhardt et al [126,127] examined the effects of monolayer Cr modification of Ru(0001). They found that for Cr deposited and annealed between 700-1000 K, Cr and Ru formed a surface alloy that enhanced the activity of CO dissociation as compared to Ru(0001).…”