STABILITY OF DISK AND STRIPE PATTERNS OF NANOSTRUCTURES AT SURFACES

[摘要] The ordering of two-dimensional Ag islands embedded in the Pt(111) surface layer has been investigated using He-atom scattering and scanning tunneling microscopy. At lower Ag coverage the embedded islands consist of compact clusters (disks) arranged into a short-range ordered two-dimensional array. At higher coverage the Ag islands have an elongated shape leading to a ''labyrinthine'' pattern of regularly spaced meandering stripes. As the temperature is increased, both the disk and stripe arrays of embedded Ag clusters transform reversibly into a disordered 2D Ag-Pt mixture. The observed behavior is explained in terms of strain-induced long-range interactions.

[发布日期] 1995-11-20

[关键词] ATOM-SOLID SCATTERING AND DIFFRACTION - ELASTIC;LOW INDEX SINGLE CRYSTAL SURFACES;PLATINUM;SCANNING TUNNELING MICROSCOPY;SILVER;SURFACE STRESS;SURFACE STRUCTURE, MORPHOLOGY, ROUGHNESS, AND TOPOGRAPHY