Fourier transform infrared spectroscopy (FTIR) is an optical analytical method used to detect the presence of organic and polymeric substances in solid, liquid, and gaseous samples. By creating an infrared absorption spectrum, it can recognise the chemical connections within a molecule. High-resolution spectral data are concurrently collected over a broad spectral range by an FTIR spectrometer.
Fourier transform infrared spectroscopy (FTIR) is an optical analytical technique frequently used to identify organic and polymeric compounds in solid, liquid and gaseous samples. It is widely used for gaining structural information of unknown compounds in samples, residue and contaminants analysis, product development, failure analysis, investigative studies, etc.
FTIR uses infrared light to irradiate a sample and polymeric and organic compounds, present in the sample, produce their distinctive fingerprint in the form of an infrared absorption spectrum (interferograms). The FTIR software applies fourier transformations to convert this interferogram to IR spectra that are unique to the various functional groups and chemical bonds present in the sample. Comparing these spectrographs against available databases can give quantitative analysis of the compounds present in the materials.
There are different sampling techniques such as transmission, specular reflectance, diffuse reflectance, and Attenuated Total Reflection (ATR). Specular reflectance is used for both organic and inorganic samples having large, flat, and reflective surfaces. In diffuse reflectance, powder samples are examined in the form of a KBr pellet. In ATR, insoluble, multi-layer, or solid samples are analyzed using hard crystal material.
In order to get over the restrictions imposed by dispersive devices, Fourier Transform Infrared (FT-IR) spectroscopy was created. The lengthy scanning procedure was the biggest challenge. It was necessary to develop a technique for sensing all infrared wavelengths simultaneously as opposed to separately. An interferometer, a very basic optical tool, was used to create a solution.
All of the infrared frequencies are “encoded” into a special kind of signal that the interferometer generates. The measurement time for the signal is typically on the order of one second or less. As a result, the time element per sample is decreased from several minutes to a few seconds.
Infrared spectroscopy now provides a number of important practical benefits thanks to the Fourier Transform Infrared (FT-IR) technology. It has enabled the creation of numerous new sampling approaches that have been intended to solve difficult situations that were insurmountable with earlier technologies. It has almost unlimited the application of infrared analysis.
Video 01: Introduction to Infrared Spectroscopy (IR)
Fourier Transform Infrared Spectroscopy (FTIR) Common Uses
Fourier Transform Infrared Spectroscopy (FTIR) Laboratories
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Fourier transform infrared spectroscopy (FTIR) provides chemical composition and physical state information of films, solids, powders, or liquids. It is used to identify and characterize unknown materials, Identify contamination, Identify additives in polymers, etc.
Typical fourier transform infrared spectroscopy (FTIR) analysis includes quantitative analysis of organic and inorganic samples. Reference libraries are available with 1000’s standards that are used to identify materials and for quantitative analysis. Gaseous phase analysis is available where FTIR can be coupled with thermal analysis, chromatography, and rheometry.
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