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Atom-selective imaging and mechanical atom manipulation using the non-contact atomic force microscope.

Seizo Morita1, Yoshiaki Sugimoto, Noriaki Oyabu

  • 1Department of Electronic Engineering, Graduate School of Engineering, Osaka University, 2-1 Yamada-Oka, Suita, Osaka 565-0871, Japan. smorita@ele.eng.osaka-u.ac.jp

Journal of Electron Microscopy
|June 8, 2004
PubMed
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Researchers used non-contact atomic force microscopy (NC-AFM) to distinguish and manipulate individual atoms like oxygen, silicon, and tin on surfaces. This technique enables precise atom placement for future nanomaterial construction.

Area of Science:

  • Surface science
  • Atomic force microscopy
  • Nanotechnology

Background:

  • Distinguishing individual atoms on surfaces is crucial for understanding surface chemistry and enabling atomic-scale engineering.
  • Precise manipulation of atoms is a key challenge in constructing novel nanomaterials and nanodevices.

Purpose of the Study:

  • To develop and demonstrate a method for distinguishing between different atomic species on surfaces using non-contact atomic force microscopy (NC-AFM).
  • To achieve controlled mechanical manipulation (removal and deposition) of individual silicon atoms on a silicon surface at the atomic level.
  • To combine atom identification and manipulation for potential future construction of complex nanostructures.

Main Methods:

  • Utilized non-contact atomic force microscopy (NC-AFM) at room temperature to image and differentiate between oxygen, silicon, and tin atoms on Si(111) surfaces.

Related Experiment Videos

  • Analyzed NC-AFM images based on atom counts, tip-sample distance dependencies, and surface distribution to identify atom species.
  • Employed soft nanoindentation with a silicon tip at 78 K for mechanical manipulation, including removing and depositing individual silicon adatoms.

    • Main Results:

    • Successfully distinguished oxygen from silicon atoms on an oxygen-adsorbed Si(111)7 x 7 surface.
    • Differentiated between silicon and tin atoms on various Sn-intermixed and mosaic-phase Si(111) surfaces.
    • Demonstrated the removal of a selected silicon adatom and the deposition of a silicon atom into a vacancy on Si(111)7 x 7 using nanoindentation at 78 K.

    Conclusions:

    • NC-AFM provides a powerful tool for atom-selective imaging and characterization at the atomic scale.
    • Mechanical manipulation via soft nanoindentation allows for precise control over individual atom placement.
    • The combination of atom identification and manipulation opens pathways for bottom-up fabrication of multi-atom-species nanomaterials and nanodevices.