Abstract
This work reports on the association between a conductive polymer and zeolite framework towards SO2. Responses and the interaction mechanism of conductive polymer/zeolite composite sensors were investigated. Poly(3,4-ethylenedioxythiophene) (PEDOT)–poly(styrene sulphonic acid) (PSS) complexes were prepared at a 1∶1 molar ratio of EDOT/PSS. The adsorption properties of the faujasite zeolite (sodium form), with a Si/Al mole ratio of 5·1, were modified by changing the existing cation with alkaline and alkaline earth metal. The composites were fabricated to investigate the effects of zeolite content (vol.-%) and cation type (univalent cation: H+, Li+, Na+ and K+; divalent cation: Mg2+, Ca2+ and Ba2+) of faujasite zeolite type Y on electrical conductivity response when exposed to SO2. The highest electrical conductivity response and sensitivity belonged to the PEDOT-PSS/KY zeolite composite. The different cation types in the Y zeolite can fine tune the adsorption–desorption properties, which influenced the electrical sensitivity of the composite. The composites showed reversibility to detect SO2.
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