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Frequency responses of bilayer modified QCM quartz crystal discs. The first layer corresponds to an identical spin-coated PDMS film, followed by a spray-coated sorbent composite suspension. The last four samples were prepared differently. The QCM responses, based on sampling 100 μg Tropine, are plotted on the ordinate. All measurements were repeated at 3 different isothermal QCM detector temperatures.
