Conductance Measurements of Alkanedicarboxylic Acids on Gold Electrodes Modified by Underpotentially Deposited Bismuth Monolayer
Date Issued
2015
Date
2015
Author(s)
Chen, Chang-Ming
Abstract
An important goal in molecular electronics is to measure and control electron transport through a molecule attached to two electrodes. Many factors influence the conductance of single molecule, such as the nature of molecular structure, anchoring groups, and electrode materials. A fine molecule-electrode contacts exhibit efficient charge transportation and high conductance. We measured the conductance of alkanedicarboxylic acids on gold electrodes modified by underpotentially deposited bismuth monolayer. Conductive atomic force microscope and scanning tunneling microscope-based break junction were employed to obtain single-molecule conductance. The conductance measured on gold electrodes modified by underpotentially deposited bismuth monolayer was one order of magnitude lager than that measured on bare Au electrodes. Transition voltage spectroscopy was used to confirm that energy alignment was not influenced by electrodes modified. The higher conductance was induced by great interactions between molecule headgroup and modified electrodes.
Subjects
STM
molecular electronics
Type
thesis
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