This title appears in the Scientific Report :
2019
Please use the identifier:
http://dx.doi.org/10.1021/acs.jpcc.9b05865 in citations.
Controlling the Electronic Contact at the Terpyridine/Metal Interface
Controlling the Electronic Contact at the Terpyridine/Metal Interface
Terpyridine derivatives reveal rich coordination chemistry and are frequently used to construct reliable metallo-supramolecular wires, which are promising candidates for optoelectronic or nanoelectronic devices. Here, we examine especially the terpyridine/electrode interface, which is a critical poi...
Saved in:
Personal Name(s): | Mennicken, Max |
---|---|
Peter, Sophia Katharina / Kaulen, Corinna / Simon, Ulrich / Karthäuser, Silvia (Corresponding author) | |
Contributing Institute: |
Elektronische Materialien; PGI-7 JARA-FIT; JARA-FIT |
Published in: |
The journal of physical chemistry |
Imprint: |
Washington, DC
Soc.66306
2019
|
DOI: |
10.1021/acs.jpcc.9b05865 |
Document Type: |
Journal Article |
Research Program: |
Controlling Collective States |
Publikationsportal JuSER |
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520 | |a Terpyridine derivatives reveal rich coordination chemistry and are frequently used to construct reliable metallo-supramolecular wires, which are promising candidates for optoelectronic or nanoelectronic devices. Here, we examine especially the terpyridine/electrode interface, which is a critical point in these organic/inorganic hybrid architectures and of utmost importance with respect to the device performance. We use the approach to assemble nanodevices by immobilization of single terpyridine-functionalized gold nanoparticles with a diameter of 13 nm in between nanoelectrodes with a separation of about 10 nm. Conductance measurements on the formed double-barrier tunnel junctions reveal several discrete conductance values in the range of 10–9–10–7 S. They can be attributed to distinct terpyridine/electrode contact geometries by comparison with conductance values estimated based on the Landauer formula. We could clearly deduce that the respective terpyridine/metal contact determines the length of the tunneling path through the molecule and thus the measured device conductance. Furthermore, the formation of a distinct terpyridine/electrode contact geometry correlates with the chemical pretreatment of the terpyridine ligand shell of the gold nanoparticles with an alkaline solution. By applying infrared reflection absorption spectroscopy, we found that only a chemical treatment with a concentrated ammonia solution results in effective deprotonation of the terpyridine anchor group. This enables the electrical contact to the middle pyridyl ring and thus a short tunneling path through the molecule corresponding to a high conductance value. These findings indicate a way to control the contact geometry at the terpyridine/metal interface, which is a prerequisite for reliable nanodevices based on this class of molecules. | ||
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700 | 1 | |a Simon, Ulrich |0 P:(DE-HGF)0 |b 3 | |
700 | 1 | |a Karthäuser, Silvia |0 P:(DE-Juel1)130751 |b 4 |e Corresponding author | |
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