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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...
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

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Comprehensive Characterization of Extended Defects in Semiconductor Materials by a Scanning Electron Microscope
11:14

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Published on: May 28, 2016

Long-range electronic perturbations caused by defects using scanning tunneling microscopy.

H A Mizes, J S Foster

    Science (New York, N.Y.)
    |May 5, 1989
    PubMed
    Summary

    Scanning tunneling microscopy observed long-range electronic perturbations from molecular defects on graphite. These defects create periodic charge density oscillations, revealing insights into defect properties.

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    Quantitative Atomic-Site Analysis of Functional Dopants/Point Defects in Crystalline Materials by Electron-Channeling-Enhanced Microanalysis

    Published on: May 10, 2021

    Area of Science:

    • Surface science
    • Condensed matter physics
    • Materials science

    Background:

    • Understanding electronic properties of surfaces is crucial.
    • Defects on surfaces can significantly alter electronic behavior.
    • Scanning tunneling microscopy (STM) is a powerful tool for atomic-scale surface analysis.

    Purpose of the Study:

    • To observe and characterize long-range electronic perturbations caused by isolated molecular defects on a graphite surface.
    • To investigate the nature of charge density oscillations induced by these defects.
    • To correlate the symmetry of oscillations with defect characteristics.

    Main Methods:

    • Utilized scanning tunneling microscopy (STM) for real-space imaging.
    • Adsorbed isolated molecules onto a highly oriented pyrolytic graphite (HOPG) surface.
    • Analyzed the resulting electronic perturbations and charge density oscillations.

    Main Results:

    • Successfully observed long-range electronic perturbations around isolated adsorbed molecules on graphite.
    • Identified periodic charge density oscillations, analogous to Friedel oscillations.
    • Determined that the oscillation wavelength is √3 times the graphite lattice constant.
    • Found that the oscillation symmetry is indicative of the specific defect molecule.

    Conclusions:

    • Isolated adsorbed molecules act as defects that induce significant long-range electronic perturbations on graphite surfaces.
    • The observed charge density oscillations provide a direct signature of the electronic influence of surface defects.
    • STM is capable of resolving these subtle electronic effects, offering a method to characterize molecular defects based on their electronic signatures.