Reliably Probing the Conductance of a Molecule in a Cavity via van der Waals Contacts
2020
To
address a long-standing issue of building molecular electrical
circuits heavily relying on anchoring chemistry, we propose an alternative
method to immobilize anchor-free molecules in a molecular cavity between
metal electrodes. In such a scheme, well-defined conductance distribution
of anchor-free molecules was obtained by means of a scanning tunneling
microscopy break-junction technique. Density functional theory calculations
suggest that effective electronic coupling at the molecule-electrode
interface can be achieved through well-defined van der Waals (vdW)
interactions when the molecule is confined in a cavity with a defined
geometry. This work offers a new paradigm to achieve reliable conductance
measurements of molecules via vdW interaction without metal-binding
groups.
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