Abstract
The structural evolution during dissolution of Cu from Cu3Pt (111) single crystal surfaces under potential control has been studied by X-ray scattering. An epitaxial, compressively strained, Pt-rich overlayer is formed upon Cu dissolution and thickens as the potential increases (more anodic). The compressive lattice strain in the Pt-rich overlayers decreases as the potential and overlayer thickness increase. The Pt-rich overlayers exhibit same fcc stacking sequence as the substrate. We compare and contrast the behavior of the dealloyed single crystals with similarly dealloyed Cu3Pt thin films and nanoparticles.
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