FTIR

FTIR SPECTROSCOPY SERVICES

Fourier Transform Infra-Red (FTIR) Spectroscopy is an infra-red spectroscopy technique, meaning the interaction of infra-red (IR) light and the sample of interest is observed to determine characteristics of the material. In FTIR Spectroscopy, a wide range of IR light wavelengths are used at once, produced by a light source. This light is either reflected on the sample, or transmitted through the sample and the out-coming beam is analyzed to determine the effect the sample had on the different wavelengths it received. Different materials absorb IR wavelengths in ways that are characteristic of the material.

In FTIR data analyses, presented as a plot of absorbance (or transmittance) as a function of wavelength, the composition of unknown materials can be accurately characterized. FTIR Spectroscopy is particularly suitable in determining impurities in and contamination of a material.

APPLICATION AREAS FOR FTIR:

FTIR data analysis is widely used as a non-destructive method for measuring the concentration of the residual oxygen in a Silicon (Si) wafer. The oxygen-related absorption peak in silicon is observed at 1106 cm-1 in infrared spectrum.

MEASUREMENTS FROM FTIR:

  • Molecular composition (solid, liquid, gas)
  • Comparison of sample to reference

USES & LIMITATIONS OF FTIR:

  • What it is great for:
    • Determining impurities in and contamination of a material, especially organic species.
    • Works for solid, liquid, powder samples
    • Complementary to Raman Spectroscope
  • Limitations:
    • Requires use of the appropriate library or use of a reference sample
    • Materials not appropriate for FTIR identification
    • Most inorganic don’t exhibit an FTIR spectrum
    • Metals (reflect IR)
    • Glass

Example Outputs

FTIR Spectroscopy

INSTRUMENTS WE USE FOR FTIR

Bruker Vector 33 FTIR bench and FTIR Microscope

Nicolet 6700 IR Spectrometer