Gas sensing behavior of nano-structured polypyrrole prepared by ‘‘carbon nanotubes seeding’’ approach

Gas-sensing behaviors to chemical vapors of both the polypyrrole and the nano-structured polypyrrole composite film prepared by adding a small amount of carbon nano-tubes (CNTs) to act as nanofiber seeds were investigated. The experimental results showed that although the gas-sensitivity of the film to trimethylamine was decreased to a certain extent by adding CNTs to form the nano-structure, the resistance of the film to moisture was improved greatly while the rapid response was remained. Moreover, SEM and XRD indicated that the orientation degree of the polypyrrole composite film was improved significantly by the CNTs.