Molecular Junctions Stabilized Manually via Tactile Feedback for the Measurements of Single–Molecule Conductance
Date Issued
2010
Date
2010
Author(s)
Tsai, Miao-Ling
Abstract
The ultimate goal of molecular electronics is the construction of electronic circuit devices from individual molecules and the electron transport through single molecules is crucial to molecular devices. The factors that influence electron transport depend not only on molecules themself but also the detail of molecule-electrode contacts. The latter is considered to be the least controllable aspect of experiments would cause conductance variability due to the contact geometry in molecular junctions. In the scanning tunneling microscopy break junction (STM BJ) method, continuous tip retraction would lead to contact conformation changes, we try to establish a stable contact between the molecule and metal probes and ensure that not the properties of an ensemble but a single molecule are been found. The results presented here is the studies of the single molecular conductance for the self-assembled monolayers (SAMs) of hexanedithiol and octanedithiol (SH-(CH2)n-HS, n=6 and 8) molecules onto Au electrodes by the conductive atomic force microscopy and the PicoAngler. By utilizing the PicoAngler with a force-feedback knob for manual control of the fixed tip-substrate spacing, which can stabilize the molecular junction, our method can not only construct the conductance histogram without the preselection process, but also receive the experimental results similar to the previous reports.
Subjects
single-molecule conductance
Type
thesis
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