Influence of steps on the orientation of copper phthalocyanine monolayers on Au(111)

I. Chizhov, G. Scoles, Antoine Kahn

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102 Scopus citations

Abstract

The structure of monolayer films of copper phthalocyanine (CuPc) deposited on a Au(111) surface in ultrahigh vacuum is studied using scanning tunneling microscopy and low-energy electron diffraction. CuPc molecules adsorb with their molecular plane parallel to the surface and form a highly ordered overlayer with a square unit cell. On terraces wider than approx. 15 nm, the orientation of the monolayer is determined by the underlying substrate and the sides of CuPc square unit cells coincide very closely with the [112̄] and [11̄0] directions of the Au(111) surface. On narrow terraces, the sides of the CuPc unit cells are aligned along the step edges. This effect is explained in terms of the maximization of coverage which favors the formation of the CuPc domains where the molecules are aligned parallel to the step edges.

Original languageEnglish (US)
Pages (from-to)4358-4361
Number of pages4
JournalLangmuir
Volume16
Issue number9
DOIs
StatePublished - May 2 2000

All Science Journal Classification (ASJC) codes

  • Materials Science(all)
  • Condensed Matter Physics
  • Surfaces and Interfaces
  • Spectroscopy
  • Electrochemistry

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