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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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Related Experiment Video

Updated: May 31, 2026

Nanoscale Characterization of Liquid-Solid Interfaces by Coupling Cryo-Focused Ion Beam Milling with Scanning Electron Microscopy and Spectroscopy
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Nanoscale Characterization of Liquid-Solid Interfaces by Coupling Cryo-Focused Ion Beam Milling with Scanning Electron Microscopy and Spectroscopy

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Ballistic emission microscopy studies on metal-molecule interfaces.

N Chandrasekhar1

  • 1Institute of Materials Research and Engineering, 3 Research Link, 117602, Singapore.

Journal of Physics. Condensed Matter : an Institute of Physics Journal
|June 23, 2011
PubMed
Summary

Ballistic electron emission microscopy (BEEM) reveals significant differences in transport uniformity through molecular layers. These findings impact the development of future electronic devices utilizing metal-molecule interfaces.

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Area of Science:

  • Materials Science
  • Surface Science
  • Nanotechnology

Background:

  • Ballistic Electron Emission Microscopy (BEEM) is a powerful technique for probing electron transport at interfaces.
  • Metal-molecule interfaces are crucial components in molecular electronics and spintronics.

Purpose of the Study:

  • To investigate the influence of molecular orientation on electron transport through a molecular layer using BEEM.
  • To compare the uniformity of transport for different molecular orientations at metal-molecule interfaces.

Main Methods:

  • Ballistic Electron Emission Microscopy (BEEM) experiments were conducted.
  • Two distinct molecular orientations were prepared and analyzed.

Main Results:

  • Significant variations in the uniformity of electron transport were observed between the two molecular orientations.
  • The data suggests that molecular arrangement critically affects charge carrier transport properties.

Conclusions:

  • Molecular orientation is a key factor determining transport uniformity in metal-molecule interfaces.
  • Understanding these transport differences is essential for designing and optimizing molecular electronic devices.