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Sensor materials based on convex and concave chemistry-optical detection and mass sensitive devices

TRANSDUCERS '91: 1991 International Conference on Solid-State Sensors and Actuators. Digest of Technical Papers, 1991

Based on the principles of convex and concave chemistry, sensor materials were developed for the detection of organic solvent vapors and ammonia. Species with pronounced electron donating properties are especially easy to detect with organic and inorganic cations. The resulting convex interactions permit the monitoring of ammonia by means of optical and resistive measurements. Concave chemistry was realized with liquid ...


QCM and SAW transducers allow analyte detection from nanometer- to micrometer-dimensions using imprinting techniques

Proceedings of the 2001 IEEE International Frequncy Control Symposium and PDA Exhibition (Cat. No.01CH37218), 2001

Mass-sensitive devices like the quartz crystal microbalance (QCM) and surface acoustic wave (SAW) devices show a major advantage as a transducer principle as every analyte can be detected due to its mass. In order to transfer QCMs and SAWS into chemical sensors a layer has to be applied in which the desired analyte is preferentially incorporated. Such coatings can vary ...



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IEEE.tv Videos

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IEEE-USA E-Books

  • Sensor materials based on convex and concave chemistry-optical detection and mass sensitive devices

    Based on the principles of convex and concave chemistry, sensor materials were developed for the detection of organic solvent vapors and ammonia. Species with pronounced electron donating properties are especially easy to detect with organic and inorganic cations. The resulting convex interactions permit the monitoring of ammonia by means of optical and resistive measurements. Concave chemistry was realized with liquid crystals, molecular holes, and channels. The incorporation of solvent vapors by cholesteric liquid crystals leads to absorbance changes by dichroic effects. Molecular holes and channels show an analogy to enzymes and are able to include guests which can be detected by mass-sensitive devices such as the quartz microbalance and the more sensitive surface-acoustic-wave oscillator.<<ETX>>

  • QCM and SAW transducers allow analyte detection from nanometer- to micrometer-dimensions using imprinting techniques

    Mass-sensitive devices like the quartz crystal microbalance (QCM) and surface acoustic wave (SAW) devices show a major advantage as a transducer principle as every analyte can be detected due to its mass. In order to transfer QCMs and SAWS into chemical sensors a layer has to be applied in which the desired analyte is preferentially incorporated. Such coatings can vary from molecular hollows like calix[n]arenes to monolayers and molecular imprinted polymers (MIP). MIPs are produced by polymerization of carefully selected monomers around a template, the desired analyte. Such monomers can carry functional groups which interact with the analyte. When the template is removed by evaporation or washed out, it leaves behind specially adapted hollows in respect to size and interactions in which the analyte can be re-included. With these sensitive layers it was possible to achieve selectivities for poly aromatic hydrocarbons which are comparable to that of natural antibodies. Bulk imprinted MIPs allow the synthesis of,highly packed artificial, receptor sites for small organic molecules. The high amount of sites within the coating of a QCM/SAW allows detection limits down to the ppb range. Due to diffusion limitations the imprinting technique has to be adapted to the size of the analyte. The technique is not limited to single compounds, complex mixtures can also be used as templates. In this way it was possible to determine motor oil degradation. Even whole cells can act as imprinting media.



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