The specificity of the core-shell polyvinylidene/polyaniline nanocomposite sensing applications

摘要

The strong differences in sensitivity of the nanostructured films of the polyvinylidene/polyaniline doped with dodecylbenzenesulfonic acid (PVDF/PANI-DBSA) nanocomposite (with the core-shell morphology) and of the neat PANI-DBSA to ammonia and moisture containing gaseous media have been found and studied. It is shown that one of the critically important factors contributing to the high sensitivity of these materials to water vapors is small thicknesses of both their nanostructured films and PANI-DBSA shells on the PVDF cores. It is established that magnitudes and rates of the sensor responses strongly depend on the mode (constant flow or injection) of the gaseous analyte delivery to the sensing film. The effect of the dispersing solvent on sensing behavior of both nanostructured PVDF/PANI-DBSA and neat PANI-DBSA has been proved and investigated.