Quartz Technology Ltd
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Quartz Technology Ltd
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Quartz crystal microbalance sorption sensors essentially weigh the amount of gas or vapour interacting with a sensing layer coated onto a microbalance. The process is essentially a single step sensing mechanism followed by a separate transduction step - direct weighing of the interacting analyte. In conductimetric sensors the interaction and transduction step (conduction change) are coupled. This feature has the advantage of allowing the array designer to optimise a single, well understood interaction - the gas/coating interaction. A wide range of well understood and stable coatings such as gas chromatography (GC) stationary phases can be utilised .
The weighing step makes certain assumptions in the performance of the coating in the presence of different vapours and the array designer will need to validate the coating experimentally. However, once suitable coatings have been selected, the inherent reliability of the quartz microbalance and coatings mean that stable and highly repeatable array fabrication is possible. |
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