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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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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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Updated: Dec 16, 2025

Fabrication of Gate-tunable Graphene Devices for Scanning Tunneling Microscopy Studies with Coulomb Impurities
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Probing plasma-treated graphene using hyperspectral Raman.

G Robert Bigras1, P Vinchon1, C Allard2

  • 1Département de Physique, Université de Montréal, 1375 Avenue Thérèse-Lavoie-Roux, Montréal, Québec H2V 0B3, Canada.

The Review of Scientific Instruments
|July 3, 2020
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Summary
This summary is machine-generated.

Global hyperspectral Raman imaging reveals how plasma treatment affects graphene, linking surface property changes to the material's initial state. This technique enables fast, high-resolution analysis of graphene films over large areas.

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Area of Science:

  • Materials Science
  • Spectroscopy
  • Nanotechnology

Background:

  • Raman spectroscopy offers detailed insights into graphene's properties, including its pristine, doped, damaged, functionalized, or stressed states.
  • Conventional Raman mapping is limited by slow, pixel-by-pixel acquisition over small areas (∼1 µm).
  • Studying large-scale graphene films necessitates advanced hyperspectral Raman imaging for fast, high-resolution analysis.

Purpose of the Study:

  • To compare scanning and global hyperspectral Raman imaging techniques for analyzing plasma-treated graphene films.
  • To develop an analysis method for assessing surface properties at defects and heterogeneities in graphene.
  • To investigate the correlation between graphene's initial state and its interaction with plasma treatment.

Main Methods:

  • Utilized two Raman imaging schemes: scanning and global hyperspectral Raman.
  • Applied a novel analysis method to assess surface properties at local defects and grain boundaries.
  • Statistically compared pristine and plasma-treated graphene regions to identify inhomogeneities.

Main Results:

  • Highlighted the presence of inhomogeneities in plasma-treated graphene, influenced by the initial surface state.
  • Demonstrated a statistical correlation between the initial graphene state and plasma interaction outcomes.
  • Showcased the capability of global hyperspectral Raman imaging to study graphene over hundreds of microns.

Conclusions:

  • Global hyperspectral Raman imaging, coupled with advanced spectral analysis, is effective for studying graphene physics and chemistry on a large scale.
  • The study provides insights into graphene's response to plasma treatment, emphasizing the role of its initial surface characteristics.
  • This approach facilitates the detailed investigation of inhomogeneities in polycrystalline and heterogeneous graphene films.