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Related Concept Videos

Raman Spectroscopy: Overview01:20

Raman Spectroscopy: Overview

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The underlying principle of Raman spectroscopy is based on the interaction between light and matter, specifically molecules' inelastic scattering of photons. When a monochromatic beam of light, typically from a laser source, interacts with a sample, most scattered light has the same frequency as the incident light. This is known as Rayleigh scattering.
However, a small fraction of the scattered light exhibits a frequency shift due to the exchange of energy between the incident photons and...
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Raman Spectroscopy Instrumentation: Overview01:26

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A conventional Raman spectrophotometer includes a laser source, a sample holding system, a wavelength selector, and a detector.
The monochromatic laser source, typically using visible or near-infrared radiation, generates a highly focused beam of light. This light interacts with the molecules of the sample, scattering some of the light. Liquid and gaseous samples are usually tested in ordinary glass capillaries, while solids can be analyzed as powders packed in capillaries or as potassium...
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Van der Waals Equation01:10

Van der Waals Equation

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The ideal gas law is an approximation that works well at high temperatures and low pressures. The van der Waals equation of state (named after the Dutch physicist Johannes van der Waals, 1837−1923) improves it by considering two factors.
First, the attractive forces between molecules, which are stronger at higher densities and reduce the pressure, are considered by adding to the pressure a term equal to the square of the molar density multiplied by a positive coefficient a. Second, the volume...
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Van der Waals Interactions01:24

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Atoms and molecules interact with each other through intermolecular forces. These electrostatic forces arise from attractive or repulsive interactions between particles with permanent, partial, or temporary charges. The intermolecular forces between neutral atoms and molecules are ion–dipole, dipole–dipole, and dispersion forces, collectively known as van der Waals forces.
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This lesson delves into the geometry of a radical, which is influenced by the electronic structure of the molecule. The principle is similar to that of a lone pair, where the unpaired electron influences the geometry at the radical center.
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¹H NMR: Complex Splitting01:13

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Resonance Raman Spectroscopy of Extreme Nanowires and Other 1D Systems
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Nontrivial Raman Characteristics in 2D Non-Van der Waals Mo5N6.

Ching-Hsiang Yao1, Hongze Gao1, Lu Ping1

  • 1Department of Chemistry, Boston University, Boston, Massachusetts 02215, United States.

ACS Nano
|November 12, 2024
PubMed
Summary

Raman spectroscopy reveals thickness-dependent shifts in molybdenum nitride (Mo5N6), a non-van der Waals material. This technique proves valuable for characterizing the thickness of 2D non-vdW materials.

Keywords:
Brite–Wigner–Fano (BWF)defect-induced peakmetal nitridesresonant Ramanthickness dependencetwo-dimensional materials

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Area of Science:

  • Materials Science
  • Condensed Matter Physics
  • Nanotechnology

Background:

  • Two-dimensional (2D) materials are crucial for next-generation electronics.
  • Non-van der Waals (vdW) 2D materials exhibit unique properties due to stronger interlayer interactions.
  • Molybdenum nitride (Mo5N6) is an emerging non-vdW 2D material with potential applications.

Purpose of the Study:

  • To investigate the resonant Raman spectra of molybdenum nitride (Mo5N6) across various thicknesses.
  • To assign observed Raman peaks using theoretical calculations and experimental measurements.
  • To explore the thickness-dependent behavior of Raman spectra in Mo5N6.

Main Methods:

  • Resonant Raman spectroscopy measurements on Mo5N6 films of varying thicknesses (few to tens of nanometers).
  • First-principles calculations to determine the stable structure and assign Raman peak frequencies.
  • Angular-dependent Raman measurements to support peak assignments.
  • Analysis of thickness-dependent Raman shifts.

Main Results:

  • Fifteen distinct Raman peaks were observed and assigned, with one intense peak at 215 cm⁻¹ identified as a defect-induced double-resonance peak.
  • The 215 cm⁻¹ peak is not observed in 3D molybdenum nitrides and is not a first-order Raman-active mode.
  • Thickness-dependent blue shifts were observed for peaks at 215 cm⁻¹ (out-of-plane) and 540 cm⁻¹ (in-plane), plateauing around 20 nm.
  • The observed thickness-dependent shifts are attributed to strong stacking interactions in non-vdW Mo5N6.

Conclusions:

  • Raman spectroscopy is a powerful tool for characterizing the thickness of 2D non-vdW materials like Mo5N6.
  • The strong interlayer interactions in non-vdW materials lead to nontrivial thickness-dependent Raman shifts.
  • Understanding these shifts provides insights into the structural and electronic properties of 2D non-vdW materials.