Electronic structure, imaging contrast and chemical reactivity of graphene moiré on metals

Abstract

Realization of graphene moiré superstructures on the surface of 4d and 5d transition metals offers templates with periodically modulated electron density, which is responsible for a number of fascinating effects, including the formation of quantum dots and the site selective adsorption of organic molecules or metal clusters on graphene. Here, applying the combination of scanning probe microscopy/spectroscopy and the density functional theory calculations, we gain a profound insight into the electronic and topographic contributions to the imaging contrast of the epitaxial graphene/Ir(111) system. We show directly that in STM imaging the electronic contribution is prevailing compared to the topographic one. In the force microscopy and spectroscopy experiments we observe a variation of the interaction strength between the tip and high-symmetry places within the graphene moiré supercell, which determine the adsorption cites for molecules or metal clusters on graphene/Ir(111).

submitted on Sep, 6th 2012

References in corpus (6)

• Graphene Segregated on Ni surfaces and Transferred to Insulators
• Two Dimensional Ir-Cluster Lattices on Moiré of Graphene with Ir(111)
• Dirac Cones and Minigaps for Graphene on Ir(111)
• Graphene on Ir(111) characterized by angle-resolved photoemission
• Graphene on Rh(111): STM and AFM studies
• Topographic and electronic contrast of the graphene moiré on Ir(111) probed by scanning tunneling microscopy and non-contact atomic force microscopy

Cited by in corpus (13)

• Graphene growth and properties on metal substrates
• Understanding the origin of band gap formation in graphene on metals: graphene on Cu/Ir(111)
• Thermal mirror buckling in freestanding graphene locally controlled by scanning tunneling microscopy
• Graphene quantum dot on boron nitride: Dirac cone replica and Hofstadter butterfly
• Graphene Ripples as a Realization of a Two-Dimensional Ising Model: A Scanning Tunneling Microscope Study
• Scanning probe microscopy and spectroscopy of graphene on metals
• Moiré superlattices in strained graphene-gold hybrid nanostructures
• Spatial segregation of substitutional B atoms in graphene patterned by the moiré superlattice on Ir(111)
• Ab-initio calculation of the real contact area on the atomic scale
• Graphene layer on Rh(111): combined DFT, STM, and NC-AFM studies
• Depressions by stacking faults in nanorippled graphene on metals
• Graphene Layer Morphology as an Indicator of the Metals Alloy Formation at the Interface
• Moiré induced organization of size-selected Pt clusters soft landed on epitaxial graphene