PMMA Coated PMN-PT Single Crystal Resonator for Sensing Chemical Agents
نویسندگان
چکیده
A highly sensitive lead magnesium niobate-lead titanate (PMN-PT) single crystal resonator coated with a thin film of polymethylmethacrylate (PMMA) useful for detecting chemical agents such as acetone, methanol, and isopropyl alcohol (IPA) is presented. Swelling of the cured PMMA polymer layer in the presence of acetone, methanol, and isopropyl alcohol vapors is sensed as a mass change transduced to an electrical signal by the PMN-PT thickness-shear mode (TSM) sensor. Frequency change in the PMN-PT sensor is demonstrated to vary according to the concentration of chemical vapor present within the sensing chamber. For acetone, the results indicate a frequency change more than 6,000 times greater than that which would be expected from a quartz crystal microbalance (QCM) coated with PMMA. This study is the first of its kind to demonstrate vapor loading of adsorbed chemical agents onto a polymer coated PMN-PT resonator.
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