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Selective Fabrication of Single-Molecule Junctions by Interface Engineering.

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  • 1Pen-Tung Sah Institute of Micro-Nano Science and Technology, College of Chemistry and Chemical Engineering and State Key Laboratory of Physical Chemistry of Solid Surfaces, IKKEM, iChEM, Xiamen University, Xiamen, 361005, China.

Small (Weinheim an Der Bergstrasse, Germany)
|November 6, 2020
PubMed
Summary

Researchers controllably fabricated single-molecule junctions using electric fields. This method allows for selective junction formation and modulation, paving the way for advanced molecular devices.

Keywords:
STM-break junctionelectrode interfacemolecular electronicssingle-molecule conductance

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Area of Science:

  • Nanoscience and Nanotechnology
  • Molecular Electronics
  • Physical Chemistry

Background:

  • Advancements in single-molecule electronics rely on precise control over molecular junction fabrication.
  • Electrically driven single-molecule behaviors offer potential for controllable device construction.

Purpose of the Study:

  • To demonstrate the selective fabrication and modulation of single-molecule junctions using an external electric field.
  • To investigate the influence of electric fields on the formation probabilities of different molecular junctions.

Main Methods:

  • Utilizing single-molecule break junction (SMBJ) techniques to form molecular junctions.
  • Analyzing plateau traces to extract formation probabilities under varying electric fields.
  • Employing density functional theory (DFT) calculations to understand molecular behavior.

Main Results:

  • Selective fabrication of single-molecule junctions (methylthio, thioacetate, amine, pyridyl) was achieved via electric field manipulation.
  • The formation probability of methylthio-anchored junctions showed a distinct trend with increasing electric field compared to others.
  • Switching between methylthio- and thioacetate-anchored junctions was demonstrated by altering the electric field in a mixed solution.

Conclusions:

  • External electric fields provide a novel approach for the controllable fabrication of single-molecule junctions.
  • This technique enables modulation of molecular junctions, offering new possibilities for bottom-up nanodevice construction.
  • The findings are consistent with theoretical predictions from DFT calculations.