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Related Concept Videos

Raman Spectroscopy: Overview01:20

Raman Spectroscopy: Overview

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 the...
Raman Spectroscopy Instrumentation: Overview01:26

Raman Spectroscopy Instrumentation: Overview

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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Related Experiment Video

Updated: Jun 10, 2026

Graphene-Assisted Quasi-van der Waals Epitaxy of AlN Film on Nano-Patterned Sapphire Substrate for Ultraviolet Light Emitting Diodes
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Published on: June 25, 2020

First-layer effect in graphene-enhanced Raman scattering.

Xi Ling1, Jin Zhang

  • 1College of Chemistry and Molecular Engineering, Peking University, Beijing 100871, People's Republic of China.

Small (Weinheim an Der Bergstrasse, Germany)
|August 24, 2010
PubMed
Summary
This summary is machine-generated.

The first layer of molecules on graphene significantly enhances Raman scattering, confirming graphene-enhanced Raman scattering (GERS) relies on a chemical-enhanced mechanism, similar to surface-enhanced Raman scattering (SERS). This finding aids in understanding molecular interactions with graphene.

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Fabrication of Three-Dimensional Graphene-Based Polyhedrons via Origami-Like Self-Folding

Published on: September 23, 2018

Area of Science:

  • Materials Science
  • Spectroscopy
  • Nanotechnology

Background:

  • Graphene-enhanced Raman scattering (GERS) utilizes graphene as a substrate to amplify Raman signals.
  • The "first-layer effect" is a known mechanism in surface-enhanced Raman scattering (SERS), explaining enhanced signals from molecules closest to the substrate.
  • Understanding the enhancement mechanisms in GERS is crucial for its application in chemical sensing and analysis.

Purpose of the Study:

  • To investigate the presence and impact of the "first-layer effect" in graphene-enhanced Raman scattering (GERS).
  • To determine the influence of molecular configuration and proximity to graphene on Raman signal enhancement.
  • To provide evidence supporting a chemical-enhanced mechanism for GERS.

Main Methods:

  • Utilized the Langmuir-Blodgett (LB) technique to create ordered mono- and multilayer aggregates of protoporphyrin IX (PPP) on graphene.
  • Collected and analyzed Raman spectra of PPP films with varying numbers of layers deposited on graphene.
  • Correlated Raman signal enhancement with the number of PPP layers and the molecular orientation relative to the graphene surface.

Main Results:

  • The first monolayer of PPP on graphene exhibited a significantly larger contribution to Raman enhancement compared to subsequent layers, demonstrating the "first-layer effect" in GERS.
  • Raman enhancement was dependent on the molecular configuration, with functional groups in direct contact with graphene showing stronger enhancement.
  • The observed distance-dependent enhancement strongly suggests a chemical-enhanced mechanism for GERS.

Conclusions:

  • Graphene-enhanced Raman scattering (GERS) exhibits a "first-layer effect", analogous to SERS, confirming its chemical-enhanced mechanism.
  • The proximity and orientation of molecules to the graphene surface are critical factors influencing Raman signal enhancement.
  • This study establishes a facile system for investigating chemical enhancement mechanisms and advancing the understanding of SERS.