Quadruped Molecular Anchoring to an Insulator: Functionalized Ferrocene on CaF2 Bulk and Thin Film Surfaces
Autor(en): | Lafloer, Linda Schlage, Fabian A. Kantorovich, Lev Moriarty, Philip J. Reichling, Michael Rahe, Philipp |
Stichwörter: | ADSORPTION; Chemistry; Chemistry, Physical; CRYSTAL; FORCE MICROSCOPY; Materials Science; Materials Science, Multidisciplinary; Nanoscience & Nanotechnology; Science & Technology - Other Topics; WIRES | Erscheinungsdatum: | 2020 | Herausgeber: | AMER CHEMICAL SOC | Journal: | JOURNAL OF PHYSICAL CHEMISTRY C | Volumen: | 124 | Ausgabe: | 18 | Startseite: | 9900 | Seitenende: | 9907 | Zusammenfassung: | The formation of insulator-supported functional molecular structures requires a firm anchoring of the molecular building blocks to the underlying surface. With a suitable anchoring mechanism, the functionality of single molecules can be maintained and molecular reaction routes for advanced fabrication can be realized to ultimately produce a functional unit. Here, we demonstrate the anchoring of a functionalized ferrocene molecule 1,1'-ferrocenedicarboxylic acid (FDCA) to the CaF2 (111) surface. Due to the large band gap and high purity of CaF2 crystals, as well as the presence of particularly large, defect-free terraces, CaF2 (111) is a prototypical insulator surface most suitable for the fabrication of molecular devices. Noncontact atomic force (NC-AFM) and scanning tunneling microscopy (STM) experiments performed on CaF2 bulk and CaF2/CaF1/Si(111) thin film samples reveal the formation of ultrasmall molecular FDCA islands composed of only a few molecules. This molecular assembly is stable even at room temperature and at temperatures as low as 5 K. A comparison of the experimental data with results of density functional theory (DFT) calculations indicates that the exceptional stability is based on a robust quadruped binding motif. This quadruped anchoring bears strong potential for creating tailored molecular structures on CaF2 (111) surfaces that are stable at room temperature. |
ISSN: | 19327447 | DOI: | 10.1021/acs.jpcc.0c00115 |
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geprüft am 18.05.2024