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Mechanical and Chemical Interactions in Atomically Defined Contacts.

Damla Yesilpinar1,2, Bertram Schulze Lammers1,2, Alexander Timmer1,2

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Small (Weinheim an Der Bergstrasse, Germany)
|July 21, 2021
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Summary
This summary is machine-generated.

Atomic force microscopy reveals how probe tip properties influence single atom manipulation. Oxygen-terminated tips enable controlled atomic manipulation via pulling, sliding, and pushing mechanisms with piconewton sensitivity.

Keywords:
atom manipulationfunctionalized tipsnon-contact atomic force microscopy

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Area of Science:

  • Surface Science
  • Atomic Force Microscopy
  • Nanotechnology

Background:

  • Atomic force microscopy (AFM) enables studying atomic interactions by measuring forces required to move single atoms or molecules.
  • Tip-sample interactions are critically dependent on the chemical and structural properties of the AFM probe tip.
  • Atomically defined contacts are essential for reproducible and interpretable single-atom manipulation experiments.

Purpose of the Study:

  • To investigate the influence of chemically and structurally diverse probe tip terminations on single atom manipulation.
  • To establish atomically defined contacts for controlled manipulation of Xenon atoms on a metal/metal-oxide boundary.
  • To quantitatively analyze the mechanical and chemical interactions governing atomic manipulation at the piconewton scale.

Main Methods:

  • Functionalization of AFM probe tips with various chemical and structural terminations.
  • Manipulation of single Xenon (Xe) atoms along an atomically defined metal/metal-oxide boundary.
  • Quantitative analysis of threshold forces and manipulation mechanisms (pulling, sliding, pushing) using piconewton sensitivity.

Main Results:

  • All tested tips exhibited a pulling mechanism for lateral Xe atom movement along the boundary, with minor force variations attributed to polarization effects.
  • Chemically reactive tips (Cu) led to Xe atom pickup rather than manipulation due to a higher energy barrier for detachment.
  • Passivation with inert particles (Xe, CO) hindered manipulation by insufficient vertical attraction and tip relaxation.
  • Structurally rigid, oxygen-terminated Cu-tips facilitated manipulation, progressing from pulling to sliding and pushing modes.

Conclusions:

  • The chemical and structural properties of the AFM probe tip are crucial determinants of single atom manipulation outcomes.
  • Oxygen-terminated Cu-tips offer superior control for atomic manipulation, enabling diverse manipulation modes.
  • Understanding these tip-sample interactions is key for advancing highly controlled nanoscale experiments with high force sensitivity.