Abstract
We present herein a Quartz Crystal Microbalance (QCM) chemical sensor in which various wt% of nano clay doped polymeric films are used to modify the piezo electric crystal for sensing of toxic chemicals in environments. Nanoclay doped polymeric interfaces are studied on QCM sensor. The microstructures of the coated film on quartz crystal obtained by solvent evaporation technique are evaluated using Atomic Force Microscope (AFM) and Scanning Electron Microscopic (SEM). Such nanoclay filled interface materials are evaluated for sensing applications. The polyepichlorohyrin (PECH) based QCM has sensitivity of detecting toxic gas (sulphur mustard) up to a concentration of 0.17 ppm with the response time of 60s. AFM and SEM study reveals that surface finish is highly uniform for nanoclay doped materials as compared to bare polymeric film. Sensor performance is enhanced as a result of nanoclay doping due to increase of the surface to volume ratio and the number of trapping sites available to the gaseous molecules for adsorption.
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