Calixarene-coated piezoelectric quartz crystal sensor for the detection of organic amine in liquids

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Abstract
Five calixarene compounds were applied as piezoelectric quartz crystal (PQC) sensory coatings for the selective detection of organic amines in liquids. The complexation based on the host–guest interaction between the calixarene coating and the analyte makes the coated PQC sensors sensitive to organic amines and results in quasi-irreversible frequency changes. The relative selectivity of the analytes is explained by the cavity inclusion of analyte molecule, complete or partial, or by steric hindrance interaction. A PQC sensor coated with a calixarene with an acetate ester group exhibits a nearly linear response for analytes in the concentration range 0–200 ppm.

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