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Electrochemical control of single-molecule conductance by Fermi-level tuning and conjugation switching.

Type of publication Peer-reviewed
Publikationsform Original article (peer-reviewed)
Author Baghernejad Masoud, Zhao Xiaotao, Baruël Ørnsø Kristian, Füeg Michael, Moreno-García Pavel, Rudnev Alexander V, Kaliginedi Veerabhadrarao, Vesztergom Soma, Huang Cancan, Hong Wenjing, Broekmann Peter, Wandlowski Thomas, Thygesen Kristian S, Bryce Martin R,
Project Electron Transport at the Nanoscale - An Electrochemical Approach II
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Original article (peer-reviewed)

Journal Journal of the American Chemical Society
Volume (Issue) 136(52)
Page(s) 17922 - 5
Title of proceedings Journal of the American Chemical Society
DOI 10.1021/ja510335z

Abstract

Controlling charge transport through a single molecule connected to metallic electrodes remains one of the most fundamental challenges of nanoelectronics. Here we use electrochemical gating to reversibly tune the conductance of two different organic molecules, both containing anthraquinone (AQ) centers, over >1 order of magnitude. For electrode potentials outside the redox-active region, the effect of the gate is simply to shift the molecular energy levels relative to the metal Fermi level. At the redox potential, the conductance changes abruptly as the AQ unit is oxidized/reduced with an accompanying change in the conjugation pattern between linear and cross conjugation. The most significant change in conductance is observed when the electron pathway connecting the two electrodes is via the AQ unit. This is consistent with the expected occurrence of destructive quantum interference in that case. The experimental results are supported by an excellent agreement with ab initio transport calculations.
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