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Related Experiment Videos

Conductance switching in single molecules through conformational changes.

Z J Donhauser1, B A Mantooth, K F Kelly

  • 1Department of Chemistry, The Pennsylvania State University, University Park, PA 16802-6300, USA.

Science (New York, N.Y.)
|June 26, 2001
PubMed
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Conductance switching in phenylene ethynylene oligomers depends on the surrounding matrix. Well-ordered matrices reduce switching rates, suggesting conformational changes drive this molecular behavior.

Area of Science:

  • Molecular Electronics
  • Conductance Switching Phenomena
  • Oligomer Dynamics

Background:

  • Understanding molecular switching is crucial for developing advanced electronic devices.
  • Phenylene ethynylene oligomers are promising candidates for molecular switches.
  • The influence of the surrounding matrix on molecular behavior is not fully understood.

Purpose of the Study:

  • To investigate the conductance switching dynamics of single and bundled phenylene ethynylene oligomers.
  • To determine the factors influencing the persistence and rate of molecular switching.
  • To elucidate the mechanism behind conductance switching in these oligomers.

Main Methods:

  • Tracking conductance switching over time for isolated and bundled oligomers.

Related Experiment Videos

  • Utilizing alkanethiolate monolayers as isolating matrices.
  • Correlating switching behavior with the ordering of the surrounding matrix.

    • Main Results:

    • Persistence times for ON/OFF states ranged from seconds to tens of hours.
    • Well-ordered matrices exhibited lower switching rates compared to poorly ordered matrices.
    • Switching frequency was higher in less ordered surrounding matrices.

    Conclusions:

    • Molecular switching is primarily driven by conformational changes in the oligomers or bundles.
    • Electrostatic effects of charge transfer are unlikely to be the main cause of switching.
    • The molecular environment significantly impacts the stability and dynamics of molecular switches.