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In this work, we have investigated and compared three important parameters: resistance, absorbance, and sensitivity of the sensitive layer in the ammonia gas sensor made of conductive polymers. Using a simulation based on the Langmuir absorption model, we have examined the changes in resistance, absorbance, and sensitivity of both the pure conducting polymer and the layer doped with carbon nanotubes. We analyzed the results using Matlab software. The findings demonstrate that the addition of carbon nanotubes reduces the resistance and enhances the absorbance and sensitivity.

This paper offers an analytical modeling of thin-filmed, multi-layer piezoelectric microcantilevers that are used as MEMS sensors. These sensors are chemical kind and use piezoelectric microcantilever. These types of microcantilevers are covered with variety of unique probe coating. The sensor has high sensitivity with external voltage measured in mV and uses PSD† system to indentify chemical ingredients of materials. The identification of the chemical ingredient of materials is based on change in angle of micro cantilever in the liquid or gas environment. The deflection of microcantilever results in varying voltage that can be used to analyze materials. Analytical simulation using Cosmol software and theoretical computations using equations will be offered in order to determine the parameters for optimal design setting. The analytical simulation includes design of mems and Cosmol software model development. The analytical model of the cantilever will be analyzed and the process of its construction will be discussed.