Journal Article

PreJuSER-53215

http://join2-wiki.gsi.de/foswiki/pub/Main/Artwork/join2_logo100x88.png Conductance of redox-active single molecular junctions: an electrochemical approach

Li, Z.FZJ* ; Pobelov, I.FZJ* ; Han, B.FZJ* ; Wandlowski, T.FZJ* ; Blaszcyk, A. ; Mayor, M.

2007
IOP Publ. Bristol

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Please use a persistent id in citations: doi:10.1088/0957-4484/18/4/044018

Abstract: 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.

Keyword(s): J

Note: Record converted from VDB: 12.11.2012

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Contributing Institute(s):

1. Grenz- und Oberflächen (IBN-3)
2. Center of Nanoelectronic Systems for Information Technology (CNI)
3. Jülich-Aachen Research Alliance - Fundamentals of Future Information Technology (JARA-FIT)

Research Program(s):

1. Grundlagen für zukünftige Informationstechnologien (P42)

Appears in the scientific report 2007

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