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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...
Attenuated Total Reflectance (ATR) Infrared Spectroscopy: Overview01:13

Attenuated Total Reflectance (ATR) Infrared Spectroscopy: Overview

Attenuated total reflectance (ATR) infrared spectroscopy is a powerful analytical technique used to study the composition of materials. It is widely employed in chemistry, materials science, forensic science, and other fields where sample characterization is required. ATR has several advantages over traditional transmission IR spectroscopy, including the requirement of little to no sample preparation and the ability to analyze a wide range of samples.
The ATR process begins by directing a beam...
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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Updated: May 18, 2026

Fabrication of polydimethylsiloxane (PDMS)-Based Flexible Surface-Enhanced Raman Scattering (SERS) Substrate for Ultrasensitive Detection
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Looking inside catalyst extrudates with time-resolved surface-enhanced Raman spectroscopy (TR-SERS).

Clare E Harvey1, Ingeborg E Iping Petterson, Bert M Weckhuysen

  • 1Debye Institute for Nanomaterials Science, Utrecht University, Universiteitsweg 99, 3584 CG Utrecht, The Netherlands.

Applied Spectroscopy
|October 4, 2012
PubMed
Summary

Time-resolved Raman spectroscopy (TRRS) overcomes fluorescence and scattering issues in heterogeneous catalyst analysis. This advancement enables deeper chemical insights and broader applications in industrial catalysis research.

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Area of Science:

  • Catalysis and Materials Science
  • Analytical Chemistry

Background:

  • Raman spectroscopy is a key nondestructive technique for studying heterogeneous catalysts.
  • Practical application on millimeter-sized catalyst bodies (e.g., extrudates) is limited by fluorescence and scattering.
  • Existing methods struggle to provide in-depth chemical information from complex catalyst structures.

Purpose of the Study:

  • To evaluate advanced Raman spectroscopy techniques for analyzing heterogeneous catalysts.
  • To overcome limitations of fluorescence and scattering in catalyst characterization.
  • To demonstrate enhanced applicability of Raman spectroscopy in industrial catalysis.

Main Methods:

  • Time-resolved Raman spectroscopy (TRRS)
  • Spatially offset Raman spectroscopy (SORS)
  • Surface-enhanced Raman spectroscopy (SERS)
  • Combinations of these techniques

Main Results:

  • TRRS effectively provides chemical information from within catalyst bodies, overcoming fluorescence.
  • TRRS allows visualization of analytes at different depths within the catalyst.
  • Time-resolved SERS offers insights into localized catalytic activity within catalyst bodies.

Conclusions:

  • Advanced Raman techniques, particularly TRRS, significantly enhance the analysis of heterogeneous catalysts.
  • These methods overcome previous limitations, making Raman spectroscopy more practical for industrial catalysis research.
  • Deeper chemical insights and visualization capabilities are now achievable for catalyst studies.