Electrical conductivity and acetaldehyde vapour sensing studies on synthetic polypyrrole-titanium(IV)sulphosalicylophosphate nanocomposite cation exchange material

摘要

In the present study, a novel electrically conductive polypyrrole-titanium(IV) sulphosalicylophosphate (PPy-TSCP) cation exchange nanocomposite was synthesized by an in situ chemical oxidative polymerization of pyrrole in the presence of titanium(IV) sulphosalicylophosphate (TSCP). The PPy-TSCP cation exchange nanocomposite was characterized by various instrumentation techniques such as FTIR, FE-SEM, XRD, TGA, DTA, DTG and EDXA. The composite exhibited good ion-exchange capacity (IEC) (2.10 meq g(-1)) as well as electrical conductivity (0.756 S cm(-1)) and isothermal stability in terms of DC electrical conductivity retention under ambient conditions up to 100 degrees C. The PPy-TSCP cation exchange nanocomposite based sensor was fabricated for the detection of acetaldehyde vapours, and it was found that the resistivity of the nanocomposite increases on exposure to a high concentration of acetaldehyde vapors at room temperature (25 degrees C). The rate of reaction for acetaldehyde vapour sensing on PPy-TSCP was observed to be first order.