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Related Concept Videos

Atomic Force Microscopy01:08

Atomic Force Microscopy

Atomic force microscopy (AFM) is a type of scanning probe microscopy that can analyze topographic details of various specimens like ceramics, glass, polymers, and biological samples. AFM offers over 1000 times more resolution than the optical imaging system. Images generated from AFM are three-dimensional surface profiles, offering an advantage over the flat, two-dimensional images from other imaging techniques.
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The probe is regarded as the heart of any AFM setup and comprises the...
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Overview of Microscopy Techniques

The early pioneers of microscopy opened a window into the invisible world of microorganisms. In 1830, Joseph Jackson Lister created an essentially modern light microscope. The 20th century saw the development of microscopes that leveraged nonvisible light, such as fluorescence microscopy that uses an ultraviolet light source and electron microscopy that uses short-wavelength electron beams. These advances significantly improved magnification, image resolution, and contrast. By comparison, the...
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
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Transmission Electron Microscopy01:15

Transmission Electron Microscopy

In 1931, physicist Ernst Ruska—building on the idea that magnetic fields can direct an electron beam just as lenses can direct a beam of light in an optical microscope—developed the first prototype of the electron microscope. This development led to the development of the field of electron microscopy. In the transmission electron microscope (TEM), electrons are produced by a hot tungsten element and accelerated by a potential difference in an electron gun, which gives them up to 400 keV in...
Overview of Electron Microscopy01:25

Overview of Electron Microscopy

The wavelengths of visible light ultimately limit the maximum theoretical resolution of images created by light microscopes. Most light microscopes can only magnify 1000X, and a few can magnify up to 1500X. Electrons, like electromagnetic radiation, can behave like waves, but with wavelengths of 0.005 nm, they produce significantly greater resolution up to 0.05 nm as compared to 500 nm for visible light. An electron microscope (EM) can create a sharp image that is magnified up to 2,000,000X.
Scanning Electron Microscopy01:07

Scanning Electron Microscopy

A scanning electron microscope (SEM) is used to study the surface features of a sample by using an electron beam that scans the sample surface in a two-dimensional manner. Typically, areas between ~1 centimeter to 5 micrometers in width can be imaged. SEM can be used to image bacteria, viruses, tissues as well as larger samples like insects. Conventional SEM gives a magnification ranging from 20X to 30,000X and spatial resolution of 50 to 100 nanometers.
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Picometer-Precision Atomic Position Tracking through Electron Microscopy
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Picometer-Precision Atomic Position Tracking through Electron Microscopy

Published on: July 3, 2021

Single atom microscopy.

Wu Zhou1, Mark P Oxley, Andrew R Lupini

  • 1Materials Science and Technology Division, Oak Ridge National Laboratory, Oak Ridge, TN 37831, USA. wu.zhou@vanderbilt.edu

Microscopy and Microanalysis : the Official Journal of Microscopy Society of America, Microbeam Analysis Society, Microscopical Society of Canada
|November 14, 2012
PubMed
Summary
This summary is machine-generated.

Advanced electron microscopy can now analyze atomic structure, chemical identity, and optical properties of defects in 2D materials with single-atom precision. This technique visualizes defect movement and quantifies scattering effects for deeper insights.

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Area of Science:

  • Materials Science
  • Condensed Matter Physics
  • Nanotechnology

Background:

  • Point defects in 2D materials significantly influence their properties.
  • Understanding defect behavior at the atomic level is crucial for material design.
  • Existing techniques often lack the resolution or sensitivity to fully characterize point defects.

Purpose of the Study:

  • To demonstrate the capability of aberration-corrected scanning transmission electron microscopy (STEM) at low voltages for analyzing point defects in monolayer graphene.
  • To simultaneously determine atomic configuration, chemical identity, and optical response at defect sites with single-atom resolution.
  • To visualize and quantify defect dynamics and electron scattering phenomena.

Main Methods:

  • Aberration-corrected scanning transmission electron microscopy (STEM) at low accelerating voltages.
  • Sequential fast-scan annular dark-field (ADF) imaging for defect visualization and diffusion analysis.
  • Quantitative image analysis for atomic identification and defect characterization.
  • Electron energy-loss spectrum imaging (EELSI) for quantifying inelastic scattering.
  • Full quantum mechanical calculations to model electron delocalization.

Main Results:

  • Simultaneous analysis of atomic structure, chemical identity, and optical response at point defect sites in graphene with single-atom resolution.
  • Direct visualization of point defect diffusion within the graphene lattice using ADF imaging.
  • Quantification of inelastic electron scattering delocalization at the single-atom level.
  • Accurate theoretical description of delocalization effects using quantum mechanical calculations.

Conclusions:

  • Low-voltage aberration-corrected STEM offers unprecedented single-atom sensitivity for probing point defects in 2D materials.
  • The developed methods enable detailed studies of defect structure, dynamics, and local optical properties.
  • This approach opens new avenues for understanding and engineering 2D materials with atomic precision.