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Related Concept Videos

Raman Spectroscopy: Overview01:20

Raman Spectroscopy: Overview

2.1K
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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2D NMR: Heteronuclear Single-Quantum Correlation Spectroscopy (HSQC)01:19

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

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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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Raman Spectroscopy Instrumentation: Overview01:26

Raman Spectroscopy Instrumentation: Overview

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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...
1.5K
Two-Dimensional (2D) NMR: Overview01:12

Two-Dimensional (2D) NMR: Overview

1.6K
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....
1.6K
2D NMR: Overview of Homonuclear Correlation Techniques01:16

2D NMR: Overview of Homonuclear Correlation Techniques

736
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...
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Two-Dimensional Heterostructure as a Platform for Surface-Enhanced Raman Scattering.

Yang Tan1, Linan Ma1, Zhibin Gao2,3,4

  • 1School of Physics, State Key Laboratory of Crystal Materials, Shandong University , Shandong, Jinan 250100, P. R. China.

Nano Letters
|March 30, 2017
PubMed
Summary
This summary is machine-generated.

Atomically thin heterostructures of tungsten diselenide (WSe2) and graphene (G) offer a novel platform for enhanced Raman scattering. The stacking order significantly influences the enhancement effect, with G/W heterostructures showing the strongest signal for copper phthalocyanine molecules.

Keywords:
Heterostructuresurface-enhanced Raman scattering

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Area of Science:

  • Materials Science
  • Surface Science
  • Spectroscopy

Background:

  • Raman enhancement on flat surfaces, particularly graphene, is a growing field.
  • Diverse two-dimensional layered materials are explored for Raman enhancement.
  • Atomic layer reassembly into heterostructures enables novel functionalities through charge carrier flow.

Purpose of the Study:

  • To demonstrate heterostructures as a novel platform for Raman enhancement.
  • To investigate the influence of stacking order on Raman enhancement.
  • To explore the underlying mechanisms of Raman enhancement in WSe2/graphene heterostructures.

Main Methods:

  • Fabrication of WSe2/graphene heterostructures with varying stacking orders (G/W, W/G, G/W/G/W, W/G/G/W).
  • Utilizing copper phthalocyanine (CuPc) as a probe molecule for Raman scattering measurements.
  • Employing first-principle calculations and probe-pump measurements to analyze interlayer coupling and electron transition probabilities.

Main Results:

  • Raman scattering intensity is significantly enhanced on heterostructures compared to isolated layers.
  • The G/W heterostructure exhibited the strongest Raman enhancement for CuPc phonon modes.
  • Enhancement effects varied with stacking order, with G/W/G/W showing comparable results to G/W.
  • Observed differences correlate with varying interlayer couplings and electron transition probabilities.

Conclusions:

  • WSe2/graphene heterostructures serve as effective platforms for Raman enhancement.
  • Stacking sequence critically impacts the Raman enhancement efficiency.
  • Interlayer coupling, influenced by stacking, governs the observed enhancement phenomena.