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Updated: Jan 15, 2026

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Atom and Molecule Migrations between Scanning Tunneling Microscopy Tips and Surfaces.

Xin Li1, Yifan Wang1, Guilin Zhu2

  • 1Center for Carbon-Based Electronics and Key Laboratory for the Physics and Chemistry of Nanodevices, School of Electronics, Peking University, Beijing 100871, China.

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|October 8, 2025
PubMed
Summary
This summary is machine-generated.

Researchers visualized atomic and molecular migrations in nanoscale junctions using scanning tunneling microscopy. This reveals the structure-conductance relationship crucial for developing reliable single-molecule electronic devices.

Keywords:
C60 conductancescanning tunneling microscopysingle atom manipulationsingle molecule manipulationsurface science

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Area of Science:

  • Nanoscale science and technology
  • Surface science
  • Single-molecule electronics

Background:

  • Chemical bond dynamics in nanoscale junctions are key to single-molecule electronics.
  • Atomic-scale visualization of junction structure is vital for understanding conductance.
  • Current methods lack direct atomic-scale correlation between structure and conductance.

Purpose of the Study:

  • To directly visualize atomic and molecular migrations within tunneling junctions.
  • To establish an atomic-scale correlation between junction structure and electrical conductance.
  • To gain insights into structural changes during junction rupture for device development.

Main Methods:

  • Utilized a low-temperature scanning tunneling microscope (LT-STM) for atomic manipulation and imaging.
  • Constructed silver (Ag) clusters (1-4 atoms) on a Ag(111) surface via tip manipulation.
  • Employed Ag and fullerene (C60) functionalized tips to probe Ag clusters and observe migrations.

Main Results:

  • Successfully visualized the migration of individual atoms and molecules within tunneling junctions.
  • Demonstrated the formation of four distinct Ag cluster structures on the Ag(111) surface.
  • Established unambiguous atomic-scale structure-conductance relationships for the studied junctions.

Conclusions:

  • Direct visualization techniques provide crucial insights into nanoscale junction behavior.
  • Understanding atom and molecule migration is essential for designing stable and reliable single-molecule electronic devices.
  • This work lays the foundation for precise control and engineering of molecular junctions.