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Synthesis and Characterization of Polyaniline-Zeolite Composites and their Response towards Carbon Monoxide

Muzzaffar Ahmad Mir

A composite of polyaniline and zeolite erionite were utilized to study the electrical response towards carbon monoxide in terms of effect of various ion exchange forms, vapor concentration, cyclic interval and zeolite content. Among various cation forms Na-form shows highest response because of having least electronegativity and large ionic radius. The response of polyaniline towards CO increases as zeolite is added to it because the gas molecules are provided with large surface area. PANI shows least response towards CO among various ion exchanged composites. The response of composite increases when exposed to CO within four minutes of exposure time and then remains constant. The response of composite decreases by increasing number of cyclic intervals. Also response of the composite towards CO attains a steady state above 50 % zeolite content due to reduction in no. of active sites. The composites were characterized by FTIR, XRD, SEM and TGA techniques.