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Related Concept Videos

Electron Microscope Tomography and Single-particle Reconstruction01:07

Electron Microscope Tomography and Single-particle Reconstruction

Transmission electron microscopy (TEM) can be used to determine the 3D structure of biological samples with the help of techniques such as electron microscope tomography and single-particle reconstruction. While single-particle reconstruction can examine macromolecules and macromolecular complexes in vitro conditions only, tomography permits the study of cell components or small cells in vivo.
Electron Tomography
Electron tomography can be performed either in TEM or STEM (scanning transmission...

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Updated: May 11, 2026

Graphene Enclosure of Chemically Fixed Mammalian Cells for Liquid-Phase Electron Microscopy
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Published on: September 21, 2020

Graphene-layered steps and their fields visualized by 4D electron microscopy.

Sang Tae Park1, Aycan Yurtsever, John Spencer Baskin

  • 1Physical Biology Center for Ultrafast Science and Technology, Arthur Amos Noyes Laboratory of Chemical Physics, California Institute of Technology, Pasadena, CA 91125, USA.

Proceedings of the National Academy of Sciences of the United States of America
|May 22, 2013
PubMed
Summary
This summary is machine-generated.

Photon-induced near-field electron microscopy (PINEM) reveals high-contrast imaging of nanometer-scale graphene steps. This technique enhances visualization of atomic layer structures, surpassing traditional electron microscopy methods.

Keywords:
atomic-scale stepsdark field imagingdiscrete dipole approximationlight scatteringphoton-electron interaction

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Area of Science:

  • Condensed Matter Physics
  • Materials Science
  • Nanotechnology

Background:

  • Graphene nanostructures exhibit unique electronic and optical properties.
  • High-resolution imaging is crucial for understanding nanoscale phenomena.
  • Traditional electron microscopy has limitations in visualizing certain nanoscale features.

Purpose of the Study:

  • To investigate the application of photon-induced near-field electron microscopy (PINEM) for imaging graphene-layered steps.
  • To achieve enhanced image contrast at atomic layer thicknesses.
  • To extend PINEM methodology to high aspect ratio nanostructures.

Main Methods:

  • Utilized photon-induced near-field electron microscopy (PINEM) with synchronous femtosecond pulses of light and electrons.
  • Imaged graphene strips (hundreds of nanometers wide, micrometers long) on a graphene substrate.
  • Supported experimental findings with theoretical analysis and numerical simulations.

Main Results:

  • Achieved significantly enhanced image contrast at graphene-layered steps (few nanometers in height) using PINEM.
  • Demonstrated that PINEM measurements reflect electron-field interactions at step edges, yielding higher contrast than bright-field TEM.
  • Elucidated the nature of the electric field at graphene layer steps.

Conclusions:

  • PINEM is a powerful technique for high-contrast imaging of atomic layer structures like graphene steps.
  • The study successfully extended PINEM applications to high aspect ratio nanostructures.
  • PINEM offers superior visualization capabilities compared to conventional electron microscopy for specific nanoscale features.