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Related Concept Videos

Preparation of Samples for Electron Microscopy01:20

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To be visualized by an electron microscope, either transmission or scanning, biological samples need to be fixed (stabilized) so the electron beam does not destroy them and dried thoroughly (desiccated/dehydrated) so the vacuum does not affect them. Fixation needs to be done as quickly as possible because the sample properties will start changing as soon as it is removed from its natural environment. For example, in a tissue sample, the oxygen levels begin decreasing, causing an altered...
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Cryo-electron Microscopy Specimen Preparation By Means Of a Focused Ion Beam
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An optimized TEM specimen preparation method of quantum nanostructures.

Hongguang Wang1, Vesna Srot1, Bernhard Fenk1

  • 1Max Planck Institute for Solid State Research, 70569 Stuttgart, Germany.

Micron (Oxford, England : 1993)
|November 16, 2020
PubMed
Summary

Optimized ion-beam-milling improves transmission electron microscopy (TEM) specimen preparation for strontium ruthenium oxide (SrRuO3) quantum dots (QDs). This method yields higher quality TEM samples of nanostructures compared to traditional techniques.

Keywords:
Focused ion beamIon millingNanoMillQuantum nanostructuresTripod polishing

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Area of Science:

  • Materials Science
  • Nanotechnology
  • Solid State Physics

Background:

  • Transmission Electron Microscopy (TEM) requires electron-transparent lamellae with preserved microstructure and chemistry for accurate analysis.
  • Preparing high-quality TEM specimens of quantum nanostructures, like quantum dots (QDs), presents significant challenges.

Purpose of the Study:

  • To optimize a sample preparation routine for high-quality TEM specimens of strontium ruthenium oxide (SrRuO3) quantum dots (QDs) on strontium titanate (STO) substrates.
  • To compare the efficacy of advanced ion-beam-milling techniques against conventional methods for TEM sample preparation of nanostructures.

Main Methods:

  • A novel ion-beam-milling approach was developed, utilizing simultaneous imaging in a focused ion-beam (FIB) device for precise QD region positioning.
  • Samples were cut at a 5° inclination relative to the QD array to ensure dot presence in the lamella.
  • Lamellae were prepared with multiple large electron-transparent regions separated by thicker walls to minimize bending.
  • A final polishing step using a NanoMill effectively removed amorphous layers without inducing further damage.

Main Results:

  • The optimized ion-beam-milling method produced higher-quality TEM specimens of SrRuO3 QDs compared to tripod polishing followed by Ar+ ion milling.
  • Simultaneous FIB imaging allowed for accurate targeting and confirmation of QDs within the prepared lamellae.
  • The resulting lamellae exhibited reduced bending and offered extensive thin areas suitable for TEM analysis.
  • The NanoMill step successfully removed surface amorphous layers, preserving the underlying nanostructure integrity.

Conclusions:

  • Advanced ion-beam-milling techniques offer a superior method for preparing TEM specimens of quantum nanostructures.
  • The developed FIB-based approach with inclined cutting and NanoMill finishing provides high-quality, artifact-free TEM lamellae of SrRuO3 QDs.
  • This optimized protocol facilitates more reliable and detailed TEM investigations of quantum nanostructures.