Substrate-induced symmetry reduction of CuPc on Cu(111) : an LT-STM study
| Autor: | H. Karacuban, O. Weingart, Johannes Schaffert, Manfred Lange, Th. Wagner, Rolf Möller |
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| Jazyk: | angličtina |
| Rok vydání: | 2009 |
| Předmět: |
Materials science
Surfaces and Interfaces Substrate (electronics) Physik (inkl. Astronomie) Condensed Matter Physics Symmetry (physics) Surfaces Coatings and Films law.invention Tunnel effect Crystallography Adsorption law Microscopy Materials Chemistry Molecule Scanning tunneling microscope Principal axis theorem |
| Popis: | The adsorption of copper phthalocyanine (CuPc) on Cu(1 1 1) was studied by means of low-temperature scanning microscopy. At very low coverage, individual molecules are randomly distributed over the surface. Increasing the coverage, the molecules align in chains before forming ordered domains with a rectangular unit cell. The molecules are centered on top of a copper atom aligning two opposite lobes with a principal axis of the substrate. The topographic images of the molecules show a reduction of the fourfold to a twofold symmetry. At negative sample bias, a switching between two states at a typical rate of 500 Hz is observed for isolated molecules, which are neither adsorbed at defects nor forming chains or domains. |
| Databáze: | OpenAIRE |
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