Phthalocyanine arrangements on Ag(100): From pure overlayers of CoPc and F16CuPc to bimolecular heterostructure
| Autor: | Franciszek Gołek, Piotr Mazur, Artur Trembulowicz, Agata Sabik, Grazyna Antczak |
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| Rok vydání: | 2018 |
| Předmět: |
Materials science
Low-energy electron diffraction General Physics and Astronomy Heterojunction 02 engineering and technology 010402 general chemistry 021001 nanoscience & nanotechnology 01 natural sciences 0104 chemical sciences law.invention Crystallography chemistry.chemical_compound Adsorption chemistry law Lattice (order) Monolayer Phthalocyanine Molecule Physical and Theoretical Chemistry Scanning tunneling microscope 0210 nano-technology |
| Zdroj: | The Journal of Chemical Physics. 149:144702 |
| ISSN: | 1089-7690 0021-9606 |
| DOI: | 10.1063/1.5050377 |
| Popis: | We have utilized scanning tunneling microscopy (STM) and low energy electron diffraction to determine the structural properties of two types of metal-phthalocyanines (MPcs), i.e., cobalt-phthalocyanine (CoPc) and hexadecafluorinated copper-phthalocyanine (F16CuPc) on the Ag(100) surface. For coverage close to one monolayer, both systems form long-range ordered structures with square unit cells. The size and rotation of the unit cell with respect to the silver lattice depend on the chemical composition of MPc. Both types of molecules prefer adsorption with around a 30° angle between the molecular axis and the [011] silver direction. The CoPcs mainly arrange in a (5 × 5)R0 phase; however, two additional local arrangements, a 26×26R11○ and a (7 × 7)R0, were detected by STM. The F16CuPcs form a 29×29R22○ structure. The co-adsorption of CoPc and F16CuPc on the Ag(100) surface in a 1:1 ratio leads to the formation of a compositionally ordered chessboard-like 52×52R45○ structure. During filled states imaging, the different appearance of the central part of each MPc allows us to distinguish CoPcs from F16CuPcs. Regardless of the applied voltage polarity, the ligands of F16CuPcs appear brighter than the ligands of CoPcs. |
| Databáze: | OpenAIRE |
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