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Title

Metal-organic extended 2D structures: Fe-PTCDA on Au(111)

AuthorsÁlvarez, Lucía; Peláez, Samuel ; Caillard, Renaud ; Serena, Pedro A. ; Martín-Gago, José A. ; Méndez, Javier
KeywordsSurface
Nanoscale materials
Organic Materials
Organometallic Materials
Scanning Tunneling Microscopy STM
Density Funtional Theory DFT
Issue Date9-Jul-2010
SeriesNanotechnology 21
305703 (2010)
AbstractIn this work we combine organic molecules of 3,4,9,10-perylenetetracarboxylic dianhydride (PTCDA) with iron atoms on an Au (111) substrate in ultra-high vacuum conditions at different temperatures. By means of scanning tunnelling microscopy (STM) we study the formation of stable 2D metal-organic structures. We show that at certain growth conditions (temperature, time and coverage) stable 'ladder-like' nanostructures are obtained. These are the result of connecting together two metal-organic chains through PTCDA molecules placed perpendicularly, as rungs of a ladder. These structures, stable up to 450 K, can be extended in a 2D layer covering the entire surface and presenting different rotation domains. STM images at both polarities show a contrast reversal between the two molecules at the unit cell. By means of density functional theory (DFT) calculations, we confirm the stability of these structures and that their molecular orbitals are placed separately at the different molecules.
URIhttp://iopscience.iop.org/0957-4484/21/30/305703
http://hdl.handle.net/10261/26142
DOI10.1088/0957-4484/21/30/305703
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