EDS analysis of bromine in polymers
Abstract
Design requirements for the Inertial Confinement Fusion program at LLNL frequently require polymers to be modified with known amounts of dopants without seriously degrading the surface finish. Techniques such as x-ray fluorescence permit reliable quantitative analyses of the dopants. However, our strong emphasis on surface finish requires frequent SEM examinations, and the need for rapid analyses instigated an evaluation of EDS to analyze bromine in the SEM. Brominated polymers based on polystyrene and a plasma-deposited hydrocarbon with a composition of approximately CH were analyzed. Since standard ZAF programs are not effective for hydrocarbon-based materials, calibration curves were generated by correlating Br Lα/C Kα peak ratios with known compositions. The ratio technique was selected because it was highly sensitive to bromine and provided an effective internal standard based on carbon. The analyses were performed using a thin window in a NORAN Micro-Z II Si(Li) EDS on a Hitachi S-800 FESEM. The specimens were coated with palladium.
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