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Folding a Single-Molecule Junction.

Chuanli Wu1,2, Demetris Bates1, Sara Sangtarash3

  • 1Department of Chemistry, University of Liverpool, Crown Street, Liverpool L69 7ZD, United Kingdom.

Nano Letters
|October 13, 2020
PubMed
Summary
This summary is machine-generated.

Molecular junctions change conductance when mechanically manipulated, revealing a new type of mechanoresistive device. Folding a molecule causes conductance changes via through-space tunneling, a novel quantum phenomenon.

Keywords:
conformationaldionemolecular devicesmechanoresistivitysingle-molecule junctionsswitching

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Area of Science:

  • Nanoelectronics
  • Quantum Phenomena
  • Molecular Devices

Background:

  • Stimuli-responsive molecular junctions are key nanoelectronic devices.
  • Quantum phenomena offer pathways to large conductance changes.

Purpose of the Study:

  • Investigate significant conductance changes in molecules via mechanical manipulation.
  • Explore novel mechanoresistive molecular devices.

Main Methods:

  • Repeatedly compressing and relaxing molecules.
  • Analyzing molecular folding and conformational changes (anti/syn).
  • Employing power spectral density analysis and DFT transport calculations.

Main Results:

  • Achieved significant conductance changes through mechanical cycling.
  • Identified molecular folding and anti-syn conformational shifts.
  • Demonstrated through-space tunneling between phenyl fragments as the conductance increase mechanism.

Conclusions:

  • This work introduces a novel class of mechanoresistive molecular devices.
  • The mechanism relies on intramolecular nonbonding interactions and through-space tunneling.
  • Contrasts with existing mechanoresistivity studies focused on molecule-electrode interfaces.