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Liquid thickness estimation in transmission electron microscopy.

Lau Morten Kaas1, Raquel Aymerich-Armengol1, Daan Hein Alsem2

  • 1Center for Visualizing Catalytic Processes (VISION), Department of Physics, Technical University of Denmark, 2800 Kongens Lyngby, Denmark.

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Summary
This summary is machine-generated.

This study introduces a new method using electron energy-loss spectroscopy (EELS) to measure thicker liquid layers in transmission electron microscopy. This technique improves nano-scale material characterization in liquid environments.

Keywords:
Clamped chip assembliesElectron energy loss spectroscopyLiquid phase transmission electron microscopyLiquid thicknessTransmission electron microscopy

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Area of Science:

  • Materials Science
  • Nanotechnology
  • Analytical Chemistry

Background:

  • Transmission electron microscopy (TEM) is crucial for studying nano-scale materials in liquid environments.
  • Accurate measurement and control of liquid thickness are vital for TEM imaging resolution and contrast.
  • The log-ratio method in electron energy-loss spectroscopy (EELS) is limited for thicker liquid layers (log-ratio > 4).

Purpose of the Study:

  • To develop an alternative method for measuring thicker liquid layers in TEM.
  • To improve the characterization of nano-scale materials under liquid exposure.
  • To address limitations of existing EELS thickness measurement techniques.

Main Methods:

  • Utilized the energy position of the multiple scattering peak in EELS for thickness measurement.
  • Applied the method under both broad-beam and focused-beam illumination conditions.
  • Investigated sample holder effects on liquid thickness.

Main Results:

  • The multiple scattering peak position in EELS provides a reliable measure for thicker liquid layers.
  • Identified silicon chip bulging as an additional source of liquid thickness variation.
  • Demonstrated methods to mitigate unwanted bulging effects in liquid holders.

Conclusions:

  • The calibrated multiple scattering peak in EELS offers a robust alternative for liquid thickness measurement.
  • Understanding and controlling sample holder-induced bulging is essential for accurate TEM analysis.
  • This work enhances the capability of time-resolved TEM for nano-materials in liquids.