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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.
The AFM Probe
The probe is regarded as the heart of any AFM setup and comprises the...
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...
Confocal Fluorescence Microscopy01:16

Confocal Fluorescence Microscopy

Confocal microscopy is an advanced microscopic technique. The prime advantage of the confocal microscope over other microscopy techniques is its ability to block the out-of-focus light from the illuminated samples using pinholes. It is widely used with fluorescence optics to obtain high-resolution, sharp contrast images. Unlike optical microscopes, confocal microscopes use a focused beam of light laser to scan the entire sample surface at different z-planes. These microscopes are, therefore,...
Total Internal Reflection Fluorescence Microscopy01:05

Total Internal Reflection Fluorescence Microscopy

Total internal reflection fluorescence microscopy or TIRF is an advanced microscopic technique used to visualize fluorophores in samples close to a solid surface with a higher refractive index, such as a glass coverslip. TIRF only allows fluorophores in proximity to the solid surface to be excited. When light from a medium with a lower refractive index (such as air) hits the glass coverslip at a critical angle, the light undergoes total internal reflection stead of passing through the glass.
Super-resolution Fluorescence Microscopy01:37

Super-resolution Fluorescence Microscopy

Super-resolution fluorescence microscopy (SRFM) provides a better resolution than conventional fluorescence microscopy by reducing the point spread function (PSF). PSF is the light intensity distribution from a point that causes it to appear blurred. Due to PSF, each fluorescing point appears bigger than its actual size, and it is the PSF interference of nearby fluorophores that causes the blurred image. Various approaches to achieving higher resolution through SRFM have recently been developed.
Phase Contrast and Differential Interference Contrast Microscopy01:26

Phase Contrast and Differential Interference Contrast Microscopy

Phase-Contrast Microscopes
In-phase-contrast microscopes, interference between light directly passing through a cell and light refracted by cellular components is used to create high-contrast, high-resolution images without staining. It is the oldest and simplest type of microscope that creates an image by altering the wavelengths of light rays passing through the specimen. Altered wavelength paths are created using an annular stop in the condenser. The annular stop produces a hollow cone of...

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Quantitative and Qualitative Examination of Particle-particle Interactions Using Colloidal Probe Nanoscopy
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Quantitative and Qualitative Examination of Particle-particle Interactions Using Colloidal Probe Nanoscopy

Published on: July 18, 2014

Quantum point contact microscopy.

Yong-Hui Zhang1, Peter Wahl, Klaus Kern

  • 1Max-Planck-Institut für Festkörperforschung, Heisenbergstrasse 1, 70569 Stuttgart, Germany. zhangyonghui02@tsinghua.org.cn

Nano Letters
|July 28, 2011
PubMed
Summary
This summary is machine-generated.

Quantum point contact microscopy (QPCM) offers a new way to map surfaces with atomic precision. This technique reveals atomic stacking and chemical variations, advancing surface characterization methods.

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Area of Science:

  • Surface Science
  • Scanning Probe Microscopy
  • Quantum Transport

Background:

  • Accurate surface characterization is crucial for understanding material properties and chemical interactions.
  • Existing microscopy techniques have limitations in resolving atomic-scale details and chemical information simultaneously.

Purpose of the Study:

  • To introduce and validate quantum point contact microscopy (QPCM) as a novel surface characterization technique.
  • To demonstrate QPCM's capability for achieving atomic resolution and chemical sensitivity.

Main Methods:

  • Developed QPCM by mapping the conductance through a quantum point contact formed by a metal atom.
  • The quantum point contact is situated between a scanning tunneling microscope tip and the sample surface.
  • Applied QPCM to copper and gold (111) surfaces, and an iron-platinum surface alloy.

Main Results:

  • Achieved reproducible atomic resolution on copper and gold (111) surfaces using QPCM.
  • Observed the alternating atomic stacking of gold (111) surface reconstruction in real space.
  • Demonstrated chemical sensitivity by detecting local variations in transport current on an Fe-Pt surface alloy due to chemical environment changes.

Conclusions:

  • QPCM is a powerful new method for high-resolution surface characterization.
  • The technique provides insights into atomic structure and chemical environments at the nanoscale.
  • QPCM holds significant potential for future applications in materials science and surface chemistry.