This title appears in the Scientific Report :
2007
Please use the identifier:
http://dx.doi.org/10.1088/0957-4484/18/4/044018 in citations.
Conductance of redox-active single molecular junctions: an electrochemical approach
Conductance of redox-active single molecular junctions: an electrochemical approach
The conductance of molecular junctions formed of N, N'-bis(n-thioalkyl)4,4'-bipyridinium bromides or alkanedithiols between a gold (Au) scanning tunnelling microscope tip and a Au(111)-(1x1) electrode has been studied at electrified solid/liquid interfaces. A statistical analysis based on...
Saved in:
Personal Name(s): | Li, Z. |
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Pobelov, I. / Han, B. / Wandlowski, Th. / Blaszcyk, A. / Mayor, M. | |
Contributing Institute: |
Center of Nanoelectronic Systems for Information Technology; CNI JARA-FIT; JARA-FIT Grenz- und Oberflächen; IBN-3 |
Published in: | Nanotechnology, 18 (2007) S. 044018 |
Imprint: |
Bristol
IOP Publ.
2007
|
Physical Description: |
044018 |
DOI: |
10.1088/0957-4484/18/4/044018 |
Document Type: |
Journal Article |
Research Program: |
Grundlagen für zukünftige Informationstechnologien |
Series Title: |
Nanotechnology
18 |
Subject (ZB): | |
Publikationsportal JuSER |
The conductance of molecular junctions formed of N, N'-bis(n-thioalkyl)4,4'-bipyridinium bromides or alkanedithiols between a gold (Au) scanning tunnelling microscope tip and a Au(111)-(1x1) electrode has been studied at electrified solid/liquid interfaces. A statistical analysis based on large sets of individual current - distance traces was applied to obtain the electrical conductance of single junctions. The one-electron reduction of the viologen moiety from the dication V2+ to the radical cation state V+. gives rise to a 50% increase of the junction conductance. Increasing the length of the alkyl spacer units leads to a tunnelling decay constant ss(CH2) = 5.9-6.1 nm(-1). This value is significantly lower than ss(CH2) = 8.2 nm(-1) estimated for molecular junctions of alkanedithiols. The difference is attributed to conformational changes within the two junctions. The contact conductance was estimated to 10 mu S. |