Single-Molecule Junctions with Highly Improved Stability
Autor: | Maïwenn Combes, Maxime Vonesch, Xinlei Yao, Xiaonan Sun, Jean Weiss, Jean-Christophe Lacroix |
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Rok vydání: | 2021 |
Předmět: |
Materials science
chemistry.chemical_element Bioengineering 02 engineering and technology 010402 general chemistry 01 natural sciences law.invention chemistry.chemical_compound law Molecule General Materials Science Mechanical Engineering Conductance Free base General Chemistry 021001 nanoscience & nanotechnology Condensed Matter Physics Porphyrin 0104 chemical sciences Crystallography chemistry Covalent bond Scanning tunneling microscope 0210 nano-technology Break junction Cobalt |
Zdroj: | Nano letters. 21(15) |
ISSN: | 1530-6992 |
Popis: | Single-molecule junctions (SMJs) have been fabricated using layers generated by diazonium electroreduction. This process creates a C-Au covalent bond between the molecule and the electrode. Rigid oligomers of variable length, based on porphyrin derivatives in their free base or cobalt complex forms, have been grafted on the surface. The conductance of the oligomers has been studied by a scanning tunneling microscopy break junction (STM-bj) technique and G(t) measurements, and the lifetime of the SMJs has been investigated. The conductance histograms indicate that charge transport in the porphyrins is relatively efficient and influenced by the presence of the cobalt center. With both systems, random telegraph G(t) signals are easily recorded, showing SMJ on/off states. The SMJs then stabilize and exhibit a surprisingly long lifetime around 10 s, and attenuation plots, obtained by both G(t) and STM-bj measurements, give identical values. This work shows that highly stable SMJs can be prepared using a diazonium grafting approach. |
Databáze: | OpenAIRE |
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