Adsorption kinetics of conducting polymer polyprrole with H2O, CO2 and O2

Polypyrrole (PPy) thin film has been used to investigated the sensor response properties against humidity (HO2), carbon Dioxide (CO2) and Oxygen (O2) in the atmospheric environment. TEM and AFM micrographs of thin films show PPY structures of big grain sizes which ranging from 200 nm- 500nm. The adsorption-desorption kinetics of the PPy data of the materials have been obtained by using Quartz Crystal Microbalance technique (QCM). Langmuir model has been used to investigate H2O, CO2, and O2 gases and to compare their adsorption and desorption kinetics of polypyrrole thin films, high-purity nitrogen gas was used as references and cleaning the desorption process. Both QCM and electrochemical deposition technique results polypyrrole coated sensors exhibited promising environmental gas sensor response at room temperature.