Fourier Transform Infrared Spectroscopy (FTIR) is an effective analytical technique for quickly identifying the “chemical family” of a substance. Typically, organic and polymeric compounds (and, to a lesser degree, inorganic compounds) produce a “fingerprint” IR spectrum, which can be compared to EAG’s extensive reference database, and the unknown component’s chemical family or actual identity may be determined.
FTIR measures the absorbance of infrared light by a sample and generates a spectrum based on the functional groups in the material. In addition to typical sample preparation methods (such as micro-extraction, dilution, KBr pellet and mulling techniques), EAG also utilizes various Attenuated Total Reflectance (ATR) accessories, which allows insoluble or multi-layer samples to be examined directly.
Ideal Uses of FTIR
Characterization and identification of complex mixtures of materials, including gases, liquids and solids
Identification of organic contaminants (e.g. particles, residues) on the macro and micro scales
Quantification of Oi in Si wafers and H in SiN, SiON and a-Si thin films (Si-H vs. N-H)
Medical device chemical characterization via ISO 10993:18
Firstly, limited surface sensitivity (typical limit of detection is a film thickness of 100 nm)
Only specific inorganic species exhibit an FTIR spectrum (for example: yes: silicates, carbonates, nitrates and sulfates; no: titinia, oxides, etc.)
Sample quantitation requires the use of standards
Glass absorbs infrared light and is not an appropriate substrate for FTIR analysis
Water also strongly absorbs infrared light and may interfere with the analysis of dissolved, suspended or wet samples
Simple cations and anions, e.g., Na+ and Cl–, do not absorb FTIR light and hence cannot be detected by FTIR. Identification of mixtures/multiple sample components may require additional laboratory preparations and analyses.
Lastly, FTIR cannot analyze metals that reflect light
FTIR Technical Specifications
Signal Detected: Infrared absorption
Elements Detected: Molecular functional groups (NOT elements)
Detection Limits: 1-10 wt% (quantification of known components); 5-20 % (identification of unknown components)
ATR Depth Resolution: ~0.1-1 micron
Transmission FTIR: Infrared light passes through the entire sample
In conclusion, EAG offers our customers FTIR services to analyze many materials. Moreover, you can count on fast turnaround times, accurate data and person-to-person service, ensuring you understand the information that you receive.
Would you like to learn more about using Fourier Transform Infrared Spectroscopy?
Contact us today for your Fourier Transform Infrared Spectroscopy (FTIR) needs. Please complete the form below to have an EAG expert contact you.
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