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Related Experiment Video

Updated: Jun 12, 2026

Detection and Quantification of Tunneling Nanotubes Using 3D Volume View Images
12:45

Detection and Quantification of Tunneling Nanotubes Using 3D Volume View Images

Published on: August 31, 2022

Recognition tunneling.

Stuart Lindsay1, Jin He, Otto Sankey

  • 1Biodesign Institute, Arizona State University, Tempe, AZ 85287, USA.

Nanotechnology
|June 5, 2010
PubMed
Summary
This summary is machine-generated.

Chemically functionalized electrodes enable reliable single-molecule interrogation in tunnel junctions. This breakthrough allows for precise analysis of intermolecular bonding and has implications for DNA sequencing.

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All-electronic Nanosecond-resolved Scanning Tunneling Microscopy: Facilitating the Investigation of Single Dopant Charge Dynamics
11:33

All-electronic Nanosecond-resolved Scanning Tunneling Microscopy: Facilitating the Investigation of Single Dopant Charge Dynamics

Published on: January 19, 2018

Area of Science:

  • Chemistry and Physics
  • Nanotechnology
  • Molecular Electronics

Background:

  • Single-molecule studies are crucial for understanding chemical and physical processes at the most fundamental level.
  • Tunnel junctions offer a platform for electronic interrogation of single molecules, but require stable and reproducible conditions.
  • Chemically functionalized electrodes are key to achieving specific molecular interactions within a tunnel junction.

Purpose of the Study:

  • To investigate the reliable interrogation of single molecules using chemically functionalized electrodes in a tunnel junction.
  • To explore the 'tethered molecule-pair' configuration for monitoring stochastic bonding fluctuations and understanding intermolecular forces.
  • To define conditions for reproducible tunneling data and explore the 'free-analyte' configuration for analyte detection.

Main Methods:

  • Utilizing chemically functionalized electrodes to create a tunnel junction for single-molecule analysis.
  • Monitoring stochastic bonding fluctuations in a 'tethered molecule-pair' configuration.
  • Employing simulations to analyze tunnel gap stability at different current levels.
  • Investigating the 'free-analyte' configuration for trapping analyte molecules and generating tunneling signals.

Main Results:

  • Demonstrated reliable single-molecule interrogation using functionalized electrodes.
  • Identified tunnel gap instability at high currents, leading to current variations.
  • Established stable tunneling conditions at low currents (large gaps) for the 'free-analyte' configuration.
  • Showed that analyte trapping in the gap generates a distinct tunneling signal.

Conclusions:

  • Chemically functionalized electrodes provide a robust method for single-molecule analysis in tunnel junctions.
  • Understanding tunnel gap dynamics is critical for reproducible electronic measurements.
  • The 'free-analyte' configuration offers a new electronic interface for detecting molecules, with potential for DNA sequencing.