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Related Concept Videos

Two-Dimensional (2D) NMR: Overview01:12

Two-Dimensional (2D) NMR: Overview

1.5K
The 1D NMR spectrum of large and complex molecules like natural products has complicated splitting patterns and overlapping signals, which can be easily interpreted using 2-dimensional (2D) NMR. Unlike 1D NMR, 2D NMR has two frequency axes that provide the coupling information between the nucleus A and nucleus B in a molecule. The process from which 2D spectra are obtained has four steps.
The first step is the preparation period, during which nucleus A is excited with a radiofrequency pulse....
1.5K
2D NMR: Overview of Homonuclear Correlation Techniques01:16

2D NMR: Overview of Homonuclear Correlation Techniques

649
Homonuclear correlation spectroscopy (COSY) is a powerful technique used in Nuclear Magnetic Resonance (NMR) spectroscopy to study the correlations between nuclei of the same type within a molecule. It provides information about scalar couplings between adjacent nuclei, which helps determine connectivity and structural information. There are several COSY variants, each with its unique strengths and experimental parameters.
COSY90 is the standard two-dimensional (2D) COSY experiment that...
649
2D NMR: Overview of Heteronuclear Correlation Techniques01:18

2D NMR: Overview of Heteronuclear Correlation Techniques

795
Heteronuclear correlation spectroscopy is an analytical technique that investigates the coupling between different types of nuclei, often a proton and an X-nucleus, such as carbon-13 or nitrogen-15. This method is commonly used in nuclear magnetic resonance (NMR) spectroscopy to gain insights into complex chemical compounds' structural and compositional aspects. A typical heteronuclear correlation spectrum displays X-nucleus chemical shifts on one axis and a proton spectrum on the other...
795
2D NMR: Homonuclear Correlation Spectroscopy (COSY)01:06

2D NMR: Homonuclear Correlation Spectroscopy (COSY)

2.0K
Homonuclear correlation spectroscopy, or COSY, is a 2-dimensional NMR technique that provides information about coupled protons. Typically, the geminal and vicinal coupling are observed. For example, consider the COSY spectrum of ethyl acetate, where its 1D proton NMR spectrum is plotted along the vertical and horizontal axes with their corresponding chemical shift scale. Three spots on the diagonal corresponding to the three peaks in the 1D proton spectrum are called diagonal peaks. The COSY...
2.0K
2D NMR: Heteronuclear Single-Quantum Correlation Spectroscopy (HSQC)01:19

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

1.4K
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...
1.4K
Molecular Shapes01:18

Molecular Shapes

61.8K
Molecules have characteristic shapes that are crucial for their function. The arrangement of various electron groups around the central atom dictates their molecular geometry. Electron pairs in the valence shell of a central atom will adopt an arrangement that minimizes repulsions between the electron pairs by maximizing the distance between them. The valence electrons form either bonding pairs, located primarily between bonded atoms, or lone pairs.
Two regions of electron density in a diatomic...
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Stable DNA Motifs, 1D and 2D Nanostructures Constructed from Small Circular DNA Molecules
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Bottom-Up Grown 2D InSb Nanostructures.

Sasa Gazibegovic1,2, Ghada Badawy1, Thijs L J Buckers1

  • 1Department of Applied Physics, Eindhoven University of Technology, 5600, MB, Eindhoven, The Netherlands.

Advanced Materials (Deerfield Beach, Fla.)
|February 20, 2019
PubMed
Summary
This summary is machine-generated.

Researchers developed novel 2D indium antimonide (InSb) nanoflakes for quantum devices. These materials exhibit high carrier mobility and quantum Hall effects, paving the way for advanced electronic applications.

Keywords:
InSbfree-standinghigh mobilitynanoflakes

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Area of Science:

  • Condensed Matter Physics
  • Materials Science
  • Nanotechnology

Background:

  • Low-dimensional indium antimonide (InSb) materials offer unique electronic properties.
  • High carrier mobility, low effective mass, and large g-factor make InSb suitable for quantum devices.
  • Existing InSb 2D electron gases and nanowires demonstrate various quantum phenomena.

Purpose of the Study:

  • To demonstrate controlled growth of 2D InSb nanostructures (nanoflakes) on an InSb platform.
  • To combine the advantages of nanoscale pristine structures and flexible design for quantum devices.
  • To enable the realization of devices like multiterminal topological Josephson devices.

Main Methods:

  • Controlled growth of 2D nanostructures (nanoflakes) on an InSb substrate.
  • Fabrication of nanoflakes with dimensions smaller than the InSb Bohr radius.
  • Experimental control over nanowire vs. nanoflake growth via parameter tuning.
  • Hall bar measurements to characterize nanostructure properties.

Main Results:

  • Demonstrated controlled growth of InSb nanoflakes with diverse dimensions and morphologies.
  • Achieved mobilities up to approximately 20,000 cm² V⁻¹ s⁻¹ in the nanostructures.
  • Observed quantum Hall plateaus, confirming high-quality 2D electron gas behavior.
  • Successfully controlled the growth to produce either nanowires or nanoflakes.

Conclusions:

  • The developed InSb nanoflakes represent a viable nanoscale 2D platform.
  • These structures possess properties suitable for next-generation quantum devices.
  • The ability to control growth offers design flexibility for advanced applications.