Growth kinetics of racemic heptahelicene-2-carboxylic acid nanowires on calcite (104)
| Autor: | Irena G. Stará, Philipp Maass, Ivo Starý, Markus Nimmrich, Tobias Richter, Mario Einax, Angelika Kühnle, Philipp Rahe |
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| Rok vydání: | 2016 |
| Předmět: |
chemistry.chemical_classification
Nanostructure Carboxylic acid Nanowire General Physics and Astronomy 02 engineering and technology Rate equation 021001 nanoscience & nanotechnology 01 natural sciences Crystallography Nanolithography chemistry Chemical physics 0103 physical sciences Self-assembly Physical and Theoretical Chemistry 010306 general physics 0210 nano-technology Row Deposition (law) |
| Zdroj: | The Journal of chemical physics. 145(13) |
| ISSN: | 1089-7690 |
| Popis: | Molecular self-assembly of racemic heptahelicene-2-carboxylic acid on a dielectric substrate at room temperature can be used to generate wire-like organic nanostructures consisting of single and double molecular rows. By means of non-contact atomic force microscopy, we investigate the growth of the wire-like pattern after deposition by experimental and theoretical means. From analyzing the time dependence of the mean row length, two distinct regimes were found. At the early post-deposition stage, the mean length grows in time. Subsequently, a crossover to a second regime is observed, where the mean row length remains nearly constant. We explain these findings by a mean-field rate equation approach providing a comprehensive picture of the growth kinetics. As a result, we demonstrate that the crossover between the two distinct regimes is accomplished by vanishing of the homochiral single rows. At later stages only heterochiral double row structures remain. Published by AIP Publishing. |
| Databáze: | OpenAIRE |
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