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Overview of Electron Microscopy01:25

Overview of Electron Microscopy

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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.
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Scanning Electron Microscopy01:07

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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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Transmission Electron Microscopy01:15

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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...
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Immunoelectron microscopy utilizes immunogold labeling of endogenous proteins with specific antibodies to detect and localize these proteins in cells and tissues. The procedure provides insights into the distribution and quantification of protein under different stimulation conditions offering clues about their functions. Conjugating highly electron-dense gold particles with primary or secondary antibodies allow antigen detection on and within cells, with high resolution and specificity.
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Conventional electron microscopy (EM) involves dehydration, fixation, and staining of biological samples, which distorts the native state of biological molecules and results in several artifacts. Also, the high-energy electron beam damages the sample and makes it difficult to obtain high-resolution images. These issues can be addressed using cryo-EM, which uses frozen samples and gentler electron beams. The technique was developed by Jacques Dubochet, Joachim Frank, and Richard Henderson, for...
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To be visualized by an electron microscope, either transmission or scanning, biological samples need to be fixed (stabilized) so the electron beam does not destroy them and dried thoroughly (desiccated/dehydrated) so the vacuum does not affect them. Fixation needs to be done as quickly as possible because the sample properties will start changing as soon as it is removed from its natural environment. For example, in a tissue sample, the oxygen levels begin decreasing, causing an altered...
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Related Experiment Video

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Correlative Light- and Electron Microscopy Using Quantum Dot Nanoparticles
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Scalable 3D Nanoparticle Trap for Electron Microscopy Analysis.

Xingwu Sun1, Erwin J W Berenschot1, Henk-Willem Veltkamp2

  • 1Mesoscale Chemical Systems, MESA+ Institute for Nanotechnology, University of Twente, P.O. Box 217, 7500, AE, Enschede, The Netherlands.

Small (Weinheim an Der Bergstrasse, Germany)
|October 17, 2018
PubMed
Summary
This summary is machine-generated.

Researchers developed smaller nanoscale pyramidal cages for precise nanoparticle trapping and tracking. This advancement enables size-selective capture and individual particle traceability using advanced lithography techniques.

Keywords:
3D nanofabricationdisplacement Talbot lithographynanoparticle trappingscanning electron microscopytransmission electron microscopy

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Area of Science:

  • Materials Science
  • Nanotechnology
  • Nanofabrication

Background:

  • Previous methods for fabricating nanoscale cages were limited in miniaturization.
  • Developing precisely controlled nanoscale structures is crucial for advanced particle manipulation.

Purpose of the Study:

  • To fabricate significantly miniaturized nanoscale pyramidal cages for size-selective nanoparticle trapping.
  • To demonstrate the capability for individual nanoparticle traceability in an array format.

Main Methods:

  • Combined wafer-scale corner lithography with displacement Talbot lithography.
  • Incorporated an additional resist etching step for creating sub-50 nm masking dots.
  • Utilized a 365 nm UV source for high-resolution patterning.

Main Results:

  • Achieved an order of magnitude reduction in pyramidal cage size compared to prior work.
  • Fabricated cages with distinct entrance and exit openings for size-selective trapping.
  • Demonstrated successful trapping of gold nanoparticles (25, 150, 200 nm).

Conclusions:

  • The novel fabrication method enables highly miniaturized pyramidal cages for controlled nanoparticle manipulation.
  • The array format and cage design facilitate individual particle traceability through correlative microscopy.
  • These advancements pave the way for precise nanoscale assembly and analysis.