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Towards atomically resolved EELS elemental and fine structure mapping via multi-frame and energy-offset correction

Yi Wang1, Michael R S Huang1, Ute Salzberger1

  • 1Stuttgart Center for Electron Microscopy, Max Planck Institute for Solid State Research, Heisenbergstr. 1, Stuttgart, 70569 Germany.

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|November 6, 2017
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Summary

We developed a new spectrum imaging technique for scanning transmission electron microscopy. This method improves chemical analysis at atomic resolution by reducing image distortions and enhancing spectral quality.

Keywords:
Core loss fine structuresEELSMapping at high resolutionSTEMSpectrum image

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Area of Science:

  • Materials Science
  • Analytical Chemistry
  • Microscopy

Background:

  • Scanning transmission electron microscopy (STEM) enables chemical analysis at atomic resolution using techniques like electron energy-loss spectroscopy (EELS) and energy-dispersive X-ray spectroscopy (EDS).
  • Despite hardware advancements, challenges remain in acquiring and interpreting high-resolution spectra, particularly for fine structures, due to image distortions and low signal-to-noise ratios.

Purpose of the Study:

  • To develop an improved spectrum imaging technique for STEM to overcome limitations in atomic-resolution chemical analysis.
  • To enhance the quality of EELS spectra and elemental mapping for detailed microstructural investigations.

Main Methods:

  • Implementation of a novel spectrum imaging technique using customized DigitalMicrograph scripts.
  • Integration of multi-frame spectrum acquisition and automatic energy-offset correction to suppress image distortions.
  • Application of the technique to SrTiO3 bulk material and Sr-doped La2CuO4 superlattices.

Main Results:

  • Significant suppression of image distortions and improvement in the signal-to-noise ratio of EELS spectra.
  • Demonstrated enhanced quality of elemental mapping for complex materials.
  • Successful application to advanced materials like perovskite superlattices.

Conclusions:

  • The developed spectrum imaging technique substantially improves the reliability and detail of atomically resolved chemical analysis in STEM.
  • This advancement opens new avenues for high-resolution EELS fine structure mapping in materials science and nanotechnology.