What is Raman Spectroscopy?

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What is Raman Spectroscopy? Blog Image


Recently, Scientists from the Centre for Nano and Soft Matter Sciences (CeNS), an autonomous institute of the Department of Science & Technology (DST), Govt. of India, have designed an efficient SERS substrate.

Why in news?

  • Scientists have developed a new low-cost substrate that can increase the sensitivity of Surface-enhanced Raman spectroscopy (SERS) -- a vital analytical and sensing tool for detecting molecules. 
  • The substrate is based on the unique sea urchin morphology of molybdenum trioxide for the rapid detection of industrial pollutants.

Key facts about the Raman spectroscopy

  • It was discovered by C.V. Raman in 1928 to study the vibrational, rotational, and low-frequency modes of the molecules.
  • Principle: The principle behind Raman spectroscopy is that the monochromatic radiation is passed through the sample such that the radiation may get reflected, absorbed, or scattered.
  • The scattered photons have a different frequency from the incident photon as the vibration and rotational properties vary.
  • Types of Raman Spectroscopy are
    • Resonance Raman Spectroscopy (RRS)
    • Surface-enhanced Raman Spectroscopy (SERS)
    • Micro-Raman Spectroscopy
    • Non-linear Raman Spectroscopic Techniques

What is a substrate?

  • A substrate can be the surface on which an organism (eg: plant, fungus, or animal) lives or the substance on which an enzyme can act.


Q1) What is a Sea urchin?

A sea urchin is a small, spiny marine animal belonging to the class Echinoidea. Sea urchins are found in oceans all over the world, from shallow rocky shores to deep ocean trenches.

Source: New low-cost substrates can enhance the sensitivity of analytical tools for detecting toxic pollutants