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Raman Spectroscopy: Overview

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...

Raman Spectroscopy Instrumentation: Overview

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: Sep 19, 2025

Sampling, Identification and Characterization of Microplastics Release from Polypropylene Baby Feeding Bottle during Daily Use

Sampling, Identification and Characterization of Microplastics Release from Polypropylene Baby Feeding Bottle during Daily Use

Published on: July 24, 2021

Raman spectroscopy for identifying postconsumer packaging plastics for recycling.

Letícia Parada Moreira¹, Amanda Selinger², Helen Sadauskas-Henrique³

¹Department of Ecotoxicology, Universidade Santa Cecília - UNISANTA, Santos, Brazil.

Journal of the Air & Waste Management Association (1995)

|June 3, 2025

Summary

Raman spectroscopy accurately identifies postconsumer plastic types (1-6) for recycling. This method enhances sorting efficiency, contributing to more sustainable plastic recycling and a circular economy.

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Area of Science:

Analytical Chemistry
Materials Science
Environmental Science

Background:

Accurate identification of postconsumer plastics is crucial for effective recycling.
Current separation methods can be inefficient, leading to contamination.
Developing advanced tools for plastic identification is essential for sustainable waste management.

Purpose of the Study:

To utilize Raman spectroscopy for identifying and separating different types of postconsumer plastics.
To assess the accuracy of Raman spectroscopy in classifying plastics for recycling applications.
To explore the potential of this technique in recycling plants and stations.

Main Methods:

Postconsumer plastic samples were analyzed using Raman spectroscopy.
Spectra were collected with a dispersive spectrometer (830 nm excitation).
Partial least squares regression was employed for spectral classification and group separation.

Main Results:

Raman spectroscopy successfully identified plastic types based on their spectral fingerprints.
A classification model achieved 100% accuracy for plastics types 1 through 6.
Similar spectra were observed for High-Density Polyethylene (PE-HD) and Low-Density Polyethylene (PE-LD) due to their shared chemical structure.
Dye peaks from packaging and labels were also detected.

Conclusions:

Raman spectroscopy is a highly effective tool for the accurate identification and separation of postconsumer plastics.
This technique can significantly improve sorting efficiency in recycling facilities.
The method supports enhanced recycling practices, reduces contamination, and promotes a circular economy.