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2D NMR: Heteronuclear Single-Quantum Correlation Spectroscopy (HSQC)01:19

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Heteronuclear single-quantum correlation spectroscopy (HSQC) is a 2D NMR technique that reveals one-bond correlations between hydrogen and a heteronucleus. The HSQC experiment is similar to the heteronuclear correlation experiment (HETCOR) but is more sensitive. In the HSQC spectrum, the proton chemical shift is plotted on the horizontal F2 axis, while the 13C chemical shift is plotted on the vertical F1 axis. The corresponding proton and 13C spectra are also shown. The HSQC contour plot does...
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Schottky defects arise when some lattice points in a crystal, such as those in NaCl, remain unoccupied, creating lattice vacancies without disturbing the overall electrical neutrality of the crystal. This defect is common in ionic crystals where the positive and negative ions are similar in size, as seen in sodium chloride and cesium chloride. The presence of Schottky defects enables the crystal to conduct electricity to a small extent through an ionic mechanism. Electric fields cause nearby...
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Non-stoichiometric defects refer to a type of defect in the crystal structure of a compound where the ratio of its constituent elements deviates from the ideal stoichiometric ratio. There are two main types of non-stoichiometric defects: metal excess defects and metal deficiency defects.Metal excess defects occur when there is a slight surplus of metal ions than what is required by the stoichiometric ratio of the compound. For example, heating a sodium chloride crystal in sodium vapor results...

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Probing Defectivity Beneath the Hydrocarbon Blanket in 2D hBN Using TEM-EELS.

Dana O Byrne1,2,3, Jim Ciston3, Frances I Allen2,3,4

  • 1Department of Chemistry, University of California, Berkeley, CA 94720, USA.

Microscopy and Microanalysis : the Official Journal of Microscopy Society of America, Microbeam Analysis Society, Microscopical Society of Canada
|July 19, 2024
PubMed
Summary

Broad-beam electron energy loss spectroscopy (EELS) effectively characterizes defects in 2D hexagonal boron nitride (hBN) despite surface contamination. This technique identifies spectral signatures of boron-oxygen bonding, quantifying defectiveness after ion beam treatments.

Keywords:
2D materialsEELScontaminationdefectshexagonal boron nitride

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Area of Science:

  • Materials Science
  • Nanotechnology
  • Surface Science

Background:

  • Controlled defect engineering in 2D materials is crucial for novel functionalities.
  • Surface contamination severely limits atomic-scale defect characterization via direct imaging.
  • Need for analysis techniques robust to contamination is critical for 2D material research.

Purpose of the Study:

  • To adapt X-ray absorption spectroscopy principles for defect characterization in 2D materials.
  • To utilize broad-beam electron energy loss spectroscopy (EELS) for analyzing 2D hexagonal boron nitride (hBN) defects.
  • To establish a method for defect quantification in hBN, even with surface contamination.

Main Methods:

  • Employed broad-beam electron energy loss spectroscopy (EELS) in a transmission electron microscope (TEM).
  • Focused analysis on the averaged fine structure of the boron K-edge in hBN.
  • Performed in-situ imaging within the TEM to monitor contamination and sample integrity.

Main Results:

  • Demonstrated TEM-EELS for ion-beam irradiated 2D hBN samples with varying ion types and doses.
  • Identified distinct spectral signatures corresponding to boron-oxygen bonding, correlating with defect levels.
  • Established boron-oxygen bonding as a quantifiable measure of sample defectiveness post-treatment.

Conclusions:

  • Broad-beam TEM-EELS provides an effective method for characterizing atomic-scale defects in 2D hBN, overcoming surface contamination limitations.
  • The technique offers spectral signatures for assessing defectiveness, particularly boron-oxygen bonding, after ion irradiation.
  • Averaging-based TEM-EELS is valuable for efficient sample surveys, complementing atomically resolved analyses.