TY  - JOUR
AU  - Li, Zhihai
AU  - Liu, Yaqing
AU  - Mertens, Stijn F. L.
AU  - Pobelov, Ilya V.
AU  - Wandlowski, Thomas
TI  - From Redox Gating to Quantized Charging
JO  - Journal of the American Chemical Society
VL  - 132
IS  - 23
SN  - 1520-5126
CY  - Washington, DC
PB  - American Chemical Society
M1  - FZJ-2015-03338
SP  - 8187 - 8193
PY  - 2010
AB  - Electron transport characteristics were studied in redox molecule-modified tunneling junctions Au(111)|6-thiohexanoylferrocene (Fc6)|solution gap|Au STM tip in the absence and in the presence of gold nanoclusters employing an electrochemical STM setup. We observed transistor- and diode-like current−voltage responses accounted for by the redox process at the ferrocene moiety. We demonstrate that the reorganization energy of the redox site decreases with decreasing gap size. As a unique new feature, we discovered the formation of uniform (size ∼2.4 nm) gold nanoparticles, upon multiple oxidation/reduction cycles of the Fc6 adlayer. The immobilized nanoparticles modify the electron transport response of the Fc6 tunneling junctions dramatically. On top of embedded single nanoparticles we observed single-electron Coulomb charging signatures with up to seven narrow and equally spaced energy states upon electrochemical gating. Our results demonstrate the power of the electrochemical approach in molecular electronics and offer a new perspective toward two-state and multistate electronic switching in condensed media at room temperature.
LB  - PUB:(DE-HGF)16
UR  - <Go to ISI:>//WOS:000278717700068
DO  - DOI:10.1021/ja102754n
UR  - https://juser.fz-juelich.de/record/201028
ER  -