Coverage-Dependent Self-Assembly Regimes of Alkyl-Substituted Thiophene Oligomers on Au(111): Scanning Tunneling Microscopy and Spectroscopy
| Autor: | Alejandro L. Briseno, George V. Nazin, Christian F. Gervasi, Stefan C. B. Mannsfeld, Dmitry A. Kislitsyn, Lei Zhang, Benjamen N. Taber |
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| Rok vydání: | 2015 |
| Předmět: |
chemistry.chemical_classification
Chemistry Analytical chemistry Surfaces Coatings and Films Electronic Optical and Magnetic Materials law.invention chemistry.chemical_compound Crystallography General Energy Adsorption law Thiophene Molecule Self-assembly Physical and Theoretical Chemistry Scanning tunneling microscope Spectroscopy Conformational isomerism Alkyl |
| Zdroj: | The Journal of Physical Chemistry C. 119:26959-26967 |
| ISSN: | 1932-7455 1932-7447 |
| Popis: | Charge transport in electronic applications involving molecular semiconductor materials strongly depends on the electronic properties of molecular-scale layers interfacing with external electrodes. In particular, local variations in molecular environments can have a significant impact on the interfacial electronic properties. In this study, we use scanning tunneling microscopy and spectroscopy to investigate the self-assembly regimes and resulting electronic structures of alkyl-substituted quaterthiophenes adsorbed on the Au(111) surface. We find that at dilute molecular concentrations, dimerized cis conformers were formed, while at higher concentrations corresponding to small fractions of a submonolayer, the molecular conformation converted to trans, with the molecules self-assembled into ordered islands. At approximately half-monolayer concentrations, the structure of the self-assembled islands transformed again showing a different type of the trans conformation and qualitatively different registry with... |
| Databáze: | OpenAIRE |
| Externí odkaz: |
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