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Related Concept Videos

Raman Spectroscopy Instrumentation: Overview01:26

Raman Spectroscopy Instrumentation: Overview

296
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...
296
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...
311

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Three-Dimensional (3D) Surface-Enhanced Raman Spectroscopy (SERS) Substrates for Sensing Low-Concentration Molecules

Ashutosh Mukherjee1,2,3, Frank Wackenhut1,2, Alfred J Meixner3,4

  • 1Center for Process Analysis and Technology (PA&T), School of Life Sciences, Reutlingen University, Alteburgstraße 150, 72762 Reutlingen, Germany.

Nanomaterials (Basel, Switzerland)
|November 8, 2024
PubMed
Summary

This study presents a novel 3D surface-enhanced Raman spectroscopy (SERS) substrate using silica microparticles with nanoparticles for reliable liquid analysis. This method enhances detection sensitivity for low-abundance analytes in real-time applications.

Keywords:
SERS in solutionSERS substratesplasmonicssilica microparticlessurface-enhanced Raman spectroscopythree-dimensional SERS substrates

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Area of Science:

  • Analytical Chemistry
  • Spectroscopy
  • Materials Science

Background:

  • Surface-enhanced Raman spectroscopy (SERS) in liquid solutions faces challenges like signal instability and low sensitivity, especially for trace analytes.
  • Existing SERS methods struggle with reproducibility and reliable data acquisition in dynamic liquid environments.

Purpose of the Study:

  • To develop a robust and reproducible 3D SERS substrate for enhanced detection in liquid samples.
  • To overcome the limitations of traditional SERS techniques in analyzing low-concentration analytes and dynamic processes.

Main Methods:

  • Fabrication of a 3D SERS substrate using silica microparticles (SMPs) functionalized with plasmonic nanoparticles (NPs).
  • Application of the 3D SERS substrate in liquid solutions, utilizing glycerin for immobilization and high-resolution imaging.
  • Conducting time-dependent SERS measurements with freely suspended SMPs in aqueous solutions.

Main Results:

  • Achieved enhancement factors (EFs) greater than 200 in both immobilized and suspended 3D SERS configurations.
  • Demonstrated reliable and reproducible SERS measurements in liquid environments.
  • Enabled sensitive detection of low-abundance analytes.

Conclusions:

  • The developed 3D SERS substrate offers a reliable method for liquid-phase analysis, overcoming previous limitations.
  • This technique shows significant potential for real-time monitoring, sensitive molecular detection, and applications in biomolecular studies, environmental monitoring, and diagnostics.