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Nana K M Nazriq1, E Minamitani2, T K Yamada1,3

  • 1Department of Materials Science, Chiba University, 1-33 Yayoi-cho, Inage-ku, Chiba 263-8522, Japan.

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Researchers precisely manipulated carbon monoxide (CO) molecules using a CO-functionalized tungsten (W) tip in scanning tunneling microscopy (STM). Repulsive interactions enabled controlled lateral movement, crucial for molecular assembly and catalysis research.

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Area of Science:

  • Surface Science
  • Nanotechnology
  • Scanning Probe Microscopy

Background:

  • Precise control of individual molecules is essential for nanoscale manipulation.
  • Scanning tunneling microscopy (STM) and atomic force microscopy (AFM) are key techniques for atomic-scale interactions.
  • Understanding tip-molecule interactions is critical for developing advanced manipulation strategies.

Purpose of the Study:

  • To demonstrate atomic-scale manipulation of target carbon monoxide (CO) molecules.
  • To investigate the interactions between a CO-functionalized tungsten (W) tip and CO molecules on a copper (Cu)(111) substrate.
  • To explore the potential of repulsive tip-molecule interactions for controlled molecular positioning.

Main Methods:

  • Fabrication of a CO-functionalized W tip by picking up a single CO molecule.
  • Utilizing an ultra-high vacuum STM system at 5 K for experiments.
  • Monitoring manipulation events via sudden current drops in simultaneously measured current-distance (I-z) curves.

Main Results:

  • Repulsive interactions between the CO-tip and target CO molecules were observed, enabling lateral hopping without vertical movement.
  • A significantly larger barrier height (∼9.5 eV) was measured, indicating electron-driven manipulation is not the primary mechanism.
  • The CO-tip selectively manipulated target CO molecules, even in the presence of nearby CO molecules, and exhibited enhanced interaction with paired CO molecules.

Conclusions:

  • CO-functionalized tips enable precise, repulsive-interaction-driven lateral manipulation of CO molecules.
  • The observed phenomenon is distinct from electron-driven manipulation and offers high selectivity.
  • Findings are valuable for designing 2D molecular networks and understanding catalytic oxidation processes.