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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.
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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.
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Ratiometric Surface-Enhanced Raman Spectroscopy Quantitative Detection Based on Interfacial Competitive Adsorption.

Longkun Yang1, Mingrui Zhang1, Ruiyang Lv1

  • 1Beijing Key Laboratory for Nano-Photonics and Nano-structure (NPNS), Department of Physics, Capital Normal University, Beijing 100048, China.

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|April 8, 2026
PubMed
Summary
This summary is machine-generated.

This study introduces a new ratiometric Surface-Enhanced Raman Spectroscopy (SERS) method for accurately measuring cationic dyes in water. The technique uses mercury ions to create a reliable signal for sensitive and precise environmental analysis.

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Area of Science:

  • Analytical Chemistry
  • Spectroscopy
  • Environmental Science

Background:

  • Surface-enhanced Raman spectroscopy (SERS) offers high sensitivity and molecular fingerprinting.
  • Quantitative SERS analysis is challenged by significant intensity fluctuations.
  • A need exists for robust, internal-standard-free quantitative SERS methods.

Purpose of the Study:

  • To develop an internal-standard-free ratiometric SERS strategy for accurate quantitation of cationic analytes.
  • To address the challenge of intensity fluctuation in SERS quantitative applications.
  • To enable sensitive detection of cationic dyes in aquatic environments.

Main Methods:

  • A ratiometric SERS approach utilizing competitive adsorption between crystal violet (CV+) and mercury ions (Hg2+) on an iodide-functionalized silver substrate.
  • Measurement of the ratiometric response (IR = I/I0) derived from Hg2+-induced signal attenuation.
  • Application of a microscopic Langmuir adsorption model to explain the quantitation mechanism.

Main Results:

  • A robust linear relationship was observed between the ratiometric response and the logarithm of CV+ concentration over a wide dynamic range (1 × 10-12 to 1 × 10-7 M).
  • The assay achieved a low detection limit of approximately 10-12 M.
  • Excellent quantitation accuracy was demonstrated, with recovery rates up to 98% in spiked samples.

Conclusions:

  • The developed ratiometric SERS strategy provides sensitive and accurate quantitation of cationic analytes without an internal standard.
  • The method overcomes SERS intensity fluctuations by employing a competitive adsorption mechanism and ratiometric signal analysis.
  • This approach holds significant potential for environmental monitoring, food safety, and biomedical applications, especially when integrated with microfluidics.