TY  - JOUR
AU  - Li, Z.
AU  - Pobelov, I.
AU  - Han, B.
AU  - Wandlowski, Th.
AU  - Blaszcyk, A.
AU  - Mayor, M.
TI  - Conductance of redox-active single molecular junctions: an electrochemical approach
JO  - Nanotechnology
VL  - 18
SN  - 0957-4484
CY  - Bristol
PB  - IOP Publ.
M1  - PreJuSER-53215
SP  - 044018
PY  - 2007
N1  - Record converted from VDB: 12.11.2012
AB  - 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.
KW  - J (WoSType)
LB  - PUB:(DE-HGF)16
UR  - <Go to ISI:>//WOS:000243841000019
DO  - DOI:10.1088/0957-4484/18/4/044018
UR  - https://juser.fz-juelich.de/record/53215
ER  -