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Liquid-Phase Electron Microscopy with Controllable Liquid Thickness.

Sercan Keskin1, Peter Kunnas1, Niels de Jonge1,2

  • 1INM - Leibniz Institute for New Materials , D-66123 Saarbrücken , Germany.

Nano Letters
|June 28, 2019
PubMed
Summary
This summary is machine-generated.

Controlling liquid thickness in liquid-phase electron microscopy (LPEM) is crucial for high-resolution imaging. A novel pressure controller precisely manipulates liquid cell membranes, enabling accurate thickness control for advanced nanoscale analysis.

Keywords:
EELSLiquid phase electron microscopyatomic resolutionliquid cellphase contrastpressure controller

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Area of Science:

  • Materials Science
  • Nanotechnology
  • Microscopy

Background:

  • Liquid-phase electron microscopy (LPEM) enables imaging in liquid environments.
  • Spatial resolution in LPEM is limited by liquid layer thickness, affecting image contrast and clarity.
  • Standard liquid cells have variable liquid thickness due to membrane deformation, differing from spacer height.

Purpose of the Study:

  • To develop a method for precise control of liquid thickness in LPEM.
  • To improve spatial resolution and contrast in LPEM imaging of nanostructures.
  • To demonstrate the capability of controlled liquid thickness for nanoscale imaging.

Main Methods:

  • Utilized a pressure controller setup to balance pressure differences across membrane windows.
  • Manipulated the shape profiles of silicon nitride (SiN) membrane windows.
  • Employed Electron Energy Loss Spectroscopy (EELS) to measure and confirm liquid thickness.

Main Results:

  • Demonstrated precise control over liquid thickness by regulating the internal pressure of the liquid cell.
  • Achieved atomic resolution imaging of gold nanoparticles.
  • Obtained clear phase contrast images of silica nanoparticles in liquid with controlled thickness.

Conclusions:

  • The developed pressure control method allows for accurate manipulation of liquid thickness in LPEM.
  • Precise liquid thickness control is essential for achieving high-resolution and high-contrast nanoscale imaging.
  • This technique enhances the utility of LPEM for studying dynamic processes in liquid environments.