Graphene-Induced Substrate Decoupling and Ideal Doping of a Self-Assembled Iron-phthalocyanine Single Layer

• Published in: Journal of physical chemistry. C Vol. 117; no. 6; pp. 3019 - 3027
• Main Authors: Scardamaglia, Mattia, Lisi, Simone, Lizzit, Silvano, Baraldi, Alessandro, Larciprete, Rosanna, Mariani, Carlo, Betti, Maria Grazia
• Format: Journal Article
• Language: English
• Published: Columbus, OH American Chemical Society 14-02-2013
• Subjects: Cross-disciplinary physics: materials science; rheology; Exact sciences and technology; Materials science; Methods of nanofabrication; Physics; Self-assembly; Moire fringes; Self-assembled layers; Coverage rate; Core levels; Thin films; Self-assembly; Electronic structure; Iron complexes; Graphene; Metallophthalocyanine; Free-standing film; Absorption spectra; X-ray photoelectron spectra
• ISSN: 1932-7447; 1932-7455
• DOI: 10.1021/jp308861b

Iron-phthalocyanine molecules self-assemble on the moiré pattern of graphene/Ir(111) as a flat and weakly interacting layer, as determined by core-level photoemission and absorption spectroscopy. The graphene buffer layer decouples the FePc two-dimensional structure from the underlying metal; the electronic structure of the FePc molecular macrocycles is preserved; and the Fe-L2,3 edges present narrower and slightly modified resonances at the FePc single-layer coverage with respect to a thin film. The FePc layer induces a slight electron doping to the Ir-supported graphene resulting in the Dirac cone position expected for an ideal free-standing-like graphene layer with the standard Fermi velocity.