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Related Experiment Videos

A fully automated, 'thimble-size' scanning tunnelling microscope.

E Laegsgaard1, F Besenbacher, K Mortensen

  • 1Institute of Physics, University of Aarhus, Denmark.

Journal of Microscopy
|December 1, 1988
PubMed
Summary
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A new scanning tunnelling microscope (STM) offers fully automated, high-stability imaging. Its innovative design uses piezoelectric ceramic tubes and a

Area of Science:

  • Materials Science and Engineering
  • Nanotechnology
  • Instrumentation

Background:

  • Scanning Tunneling Microscopy (STM) is a powerful surface analysis technique.
  • Conventional STMs often require complex mechanical components and are sensitive to environmental factors.
  • There is a need for more stable, automated, and user-friendly STM systems.

Purpose of the Study:

  • To develop a novel, fully automated, high-stability, high-eigenfrequency scanning tunnelling microscope (STM).
  • To introduce a new linear motor ('nano-worm') for precise tip positioning.
  • To enhance the convenience and reduce the sensitivity of STM operation.

Main Methods:

  • The developed STM utilizes two piezoelectric ceramic tubes for tip motion (x-y-z) and coarse positioning ('nano-worm').

Related Experiment Videos

  • The 'nano-worm' allows for electronic control of tip advancement in 0.2-16 nm steps over a 2 mm range at speeds up to 2000 steps/s.
  • An axial-symmetry, temperature-compensated construction minimizes sensitivity to vibrations and temperature fluctuations.

    • Main Results:

    • The novel STM demonstrates high stability and high eigenfrequency, enabling precise imaging.
    • The 'nano-worm' facilitates fully electronic, convenient tip positioning without mechanical coupling.
    • The microscope exhibits reduced sensitivity to mechanical/acoustic vibrations and temperature variations.
    • Successful imaging of various surfaces, including graphite and biological samples, was achieved in air.

    Conclusions:

    • The developed automated STM offers a significant advancement in ease of use and operational stability.
    • The integration of piezoelectric tubes and the 'nano-worm' linear motor provides precise, electronically controlled nanoscale positioning.
    • This novel STM design is suitable for imaging diverse samples under ambient conditions, broadening its applicability.