Abstract
A highly sensitive lead magnesium niobate–lead titanate (PMN–PT) single crystalresonator coated with a thin film of polymethylmethacrylate (PMMA) useful for detectingchemical agents such as acetone, methanol, and isopropyl alcohol is presented. Swelling ofthe cured PMMA polymer layer in the presence of acetone, methanol, and isopropyl alcoholvapors is sensed as a mass change transduced to an electrical signal by the PMN–PTthickness shear mode sensor. Frequency change in the PMN–PT sensor is demonstrated tovary according to the concentration of the chemical vapor present within thesensing chamber. For acetone, the results indicate a frequency change more than6000 times greater than that which would be expected from a quartz crystalmicrobalance coated with PMMA. This study is the first of its kind to demonstrate vaporloading of adsorbed chemical agents onto a polymer coated PMN–PT resonator.
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