Research output: Contribution to Journal/Magazine › Journal article › peer-review
Research output: Contribution to Journal/Magazine › Journal article › peer-review
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TY - JOUR
T1 - From redox gating to quantized charging
AU - Li, Z.
AU - Liu, Y.
AU - Mertens, S.F.L.
AU - Pobelov, I.V.
AU - Wandlowski, T.
PY - 2010
Y1 - 2010
N2 - 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. © 2010 American Chemical Society.
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. © 2010 American Chemical Society.
KW - Adlayers
KW - Au(1 1 1 )
KW - Condensed media
KW - Coulomb charging
KW - Current-voltage response
KW - Electrochemical gating
KW - Electrochemical STM
KW - Electron transport
KW - Electronic switching
KW - Energy state
KW - Ferrocene moiety
KW - Gap size
KW - Gold nanocluster
KW - Gold Nanoparticles
KW - Immobilized nanoparticle
KW - Multi state
KW - Quantized charging
KW - Redox gating
KW - Redox molecules
KW - Redox process
KW - Redox sites
KW - Reorganization energies
KW - Room temperature
KW - Single electron
KW - Single nanoparticle
KW - Tunneling junctions
KW - Two-state
KW - Electron transitions
KW - Electron transport properties
KW - Iron compounds
KW - Molecular electronics
KW - Tunneling (excavation)
KW - Nanoparticles
KW - ferrocene
KW - gold nanoparticle
KW - article
KW - channel gating
KW - diode
KW - electric current
KW - electric potential
KW - electrochemistry
KW - electron transport
KW - electronics
KW - oxidation reduction reaction
KW - particle size
KW - room temperature
KW - semiconductor
KW - Electric Conductivity
KW - Electrochemistry
KW - Electrodes
KW - Electrolytes
KW - Electron Transport
KW - Ferrous Compounds
KW - Gold
KW - Organometallic Compounds
KW - Spectrum Analysis
KW - Surface Properties
KW - Transistors, Electronic
U2 - 10.1021/ja102754n
DO - 10.1021/ja102754n
M3 - Journal article
VL - 132
SP - 8187
EP - 8193
JO - Journal of the American Chemical Society
JF - Journal of the American Chemical Society
SN - 0002-7863
IS - 23
ER -