Fourier transform infrared (FTIR) microscopy identifies organic contaminants, residues, polymers, and adhesives by their molecular fingerprint. Combining an infrared spectrometer with a microscope, it analyzes particles, films, and residues down to microscopic size, and reference library matching identifies the material and helps trace contamination to its source.
FTIR microscopy is also referred to as micro-FTIR, FT-IR microscopy, and infrared microspectroscopy.
Materials FTIR Identifies
- Flux and process residues
- Polymers, plastics, and fibers
- Adhesives, epoxies, and conformal coatings
- Oils, greases, and lubricants
- Silicone contamination and outgassing films
- Foreign particles and debris
How FTIR Microscopy Works
Infrared light passes through the sample, and molecular bonds absorb energy at frequencies characteristic of their chemical structure. The resulting absorption spectrum acts as a molecular fingerprint. The microscope isolates the specific particle or region of interest, so a single contaminant can be analyzed without interference from surrounding material. The measured spectrum is then compared against a reference library to identify the material.
Applications
- Electronics: residues that cause leakage, corrosion, or poor adhesion on die, packages, and circuit boards.
- Medical devices: particulate and residue identification on implants, components, and device surfaces.
- Space and defense hardware: debris and outgassing residue identification on sensitive assemblies.
- Manufacturing: verification of incoming materials and investigation of process contamination.
FTIR and SEM/EDX: Complete Contamination Identification
FTIR identifies organic compounds by molecular structure, while SEM/EDX identifies the elements present, which is ideal for metals, salts, and inorganic residues. Many contaminants contain both organic and inorganic components, so using the two techniques together provides a complete identification of debris and contamination.
Turnaround and Deliverables
Typical turnaround for FTIR analysis is 2 to 3 days. Results include the measured spectra, reference library match results, and an interpretation of the material identity in an engineering report.
Related Services
- Scanning Electron Microscopy (SEM/EDX)
- Low Power Optical Microscopy
- High Power Reflected Optical Microscopy
- Cross-Sectioning Services
Frequently Asked Questions
What can FTIR identify?
FTIR identifies organic and many inorganic compounds by their infrared absorption, including polymers, adhesives, flux residues, oils, silicones, and fibers.
How small a particle can FTIR microscopy analyze?
FTIR microscopy analyzes particles and residues at microscopic scale, isolating a single contaminant from its surroundings. Contact us with your sample size and we will confirm feasibility.
Should I use FTIR or SEM/EDX for contamination analysis?
Use FTIR for organic materials and SEM/EDX for metals and inorganic residues. When the contaminant is unknown, using both techniques together gives the most complete identification.
Request FTIR Analysis
Watson Analytical is an ISO 9001:2015 certified, ITAR-registered failure analysis laboratory in San Diego, California, serving semiconductor, defense, space, biomedical, and litigation customers. Contact us to discuss your samples and request a quote.