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Related Concept Videos

Overview of Microscopy Techniques01:22

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...
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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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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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Hand Controlled Manipulation of Single Molecules via a Scanning Probe Microscope with a 3D Virtual Reality Interface
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Theoretical simulation of scanning probe microscopy.

Masaru Tsukada1

  • 1WPI Advanced Institute for Materials Research, Tohoku University, Katahira 2-1-1, Aoba, Sendai 980-8577, Japan. tsukada@wpi-aimr.tohoku.ac.jp

Analytical Sciences : the International Journal of the Japan Society for Analytical Chemistry
|February 16, 2011
PubMed
Summary
This summary is machine-generated.

Theoretical simulations for scanning probe microscopy techniques like scanning tunneling microscopy (STM), atomic force microscopy (AFM), and Kelvin probe force microscopy (KPFM) are reviewed. Advanced methods for STM, AFM, and KPFM simulations are presented with recent case studies.

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Area of Science:

  • Physics
  • Materials Science
  • Chemistry

Background:

  • Scanning probe microscopy (SPM) techniques are crucial for nanoscale surface characterization.
  • Theoretical simulations provide insights into SPM experimental data and guide future research.
  • Existing simulation methods require advancements to accurately model complex tip-sample interactions.

Purpose of the Study:

  • To review and present advanced theoretical simulation methods for SPM techniques.
  • To highlight recent case studies in scanning tunneling microscopy (STM), atomic force microscopy (AFM), and Kelvin probe force microscopy (KPFM).
  • To introduce novel formalisms and approaches for improved simulation accuracy.

Main Methods:

  • Non-equilibrium Green's function theory beyond Bardeen's perturbation theory for STM simulations.
  • 3D-force mapping and theoretical analysis of nano-mechanical experiments for AFM simulations.
  • Electrostatic multi-pole interaction modeling for KPFM image simulations.

Main Results:

  • Emphasis on the importance of tip electronic states in STM simulations.
  • Demonstration of 3D-force maps for AFM in aqueous environments.
  • Theoretical analysis of protein molecule nano-mechanical experiments.
  • Introduction of a simulation approach for KPFM based on multi-pole interactions.

Conclusions:

  • Advanced theoretical simulations are essential for interpreting and predicting SPM experimental outcomes.
  • Novel methods enhance the accuracy and applicability of STM, AFM, and KPFM simulations.
  • These simulation advancements facilitate deeper understanding of nanoscale phenomena and material properties.