Selective detection of organic molecules with polymers and supramolecular compounds: application of capacitance, quartz microbalance and calorimetric transducers

Microsensors for In-Situ, Real-Time Detection and Characterization of Toxic Organic Substances

“…Moderately chemically specific (surface modification) coatings can be used to enhance the adsorption of target molecules. However, unlike gravimetric type devices the selectivity of micro-calorimetric spectroscopy is not a consequence of a highly selective coating but comes from the unique photothermal signature for each target chemical [20][21][22][23][24][25][26]. In addition regeneration can also be accomplished.…”

Synthesis of Novel β-Cyclodextrin and Calixarene Derivatives and Their Use in Gas Sensing on the Basis of Molecular Recognition

“…[4Ϫ6] Supramolecular compounds possess inherent advantages for use as coating materials, because their molecular recognition ability and selectivity may be readily adjusted by chemical modification and tailoring. Various macrocyclic receptors, such as crown ethers, [7] cryptands, [8,9] cavitands, [10,11] cyclodextrins [12Ϫ15] and calixarenes, [16,17] have therefore been used as coatings for piezoelectric quartz crystal sensors.…”

Detection of some volatile organic compounds with chitosan-coated quartz crystal microbalance

“…The frequency of the quartz crystal decreased due to the adsorption of the vapors into the film according to Equation (1). The equilibrium was obtained after few minutes.…”

“…Macrocyclics, [1][2][3][4] mono-and multi-layers [5][6][7], and bio-organic molecules [8,9] have been used as coatings on the QCM electrode to improve its sensitivity and selectivity. It has been reported that in the gas systems, the simple dispersion forces, hydrogen bonding, or dipole-dipole interactions between the sensor coating and the analytes result in an increased signal intensity.…”