N-Heterocyclic Carbenes for the Self-Assembly of Thin and Highly Insulating Monolayers with High Quality and Stability
| Autor: | Mateusz Wróbel, Krzysztof Kozieł, Anna Krzykawska, Piotr Cyganik |
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| Rok vydání: | 2020 |
| Předmět: |
bond strength
Nanostructure Materials science self-assembled monolayers General Engineering General Physics and Astronomy Molecular electronics Nanotechnology Self-assembled monolayer self-assembly 02 engineering and technology 010402 general chemistry 021001 nanoscience & nanotechnology 01 natural sciences thermal stability 0104 chemical sciences Monolayer General Materials Science Thermal stability N-heterocyclic carbenes conductivity Self-assembly 0210 nano-technology |
| Zdroj: | ACS Nano. 14:6043-6057 |
| ISSN: | 1936-086X 1936-0851 |
| DOI: | 10.1021/acsnano.0c01733 |
| Popis: | As an organic nanostructure, self-assembled monolayers (SAMs) play a central role in many aspects of nanotechnology, including molecular electronics. In this work, we show that SAMs based on N-heterocyclic carbenes on a Au(111) substrate offer a high level of crystallinity and also exhibit the highest possible packing density. As a result of this structural optimization, defect concentrations were reduced by 2-3 orders of magnitude and thermal stability was ∼100 K higher than those of any other SAMs on Au. The conductivity of these SAMs is ∼4 orders of magnitude lower than that of standard alkanethiols of comparable length, which together with very low defect concentration and high thermal stability makes them a highly interesting material for potential application in organic thin film transistors. The self-assembly of such dense, highly crystalline, and notably stable structures is associated with strong C-Au bonding and the rational design of assembled molecules, resulting in the high mobility of both adsorbate and substrate atoms, as confirmed by the size of the molecular domains and the adsorbate-driven modification of the Au(111) substrate, respectively. |
| Databáze: | OpenAIRE |
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