POLY(N-VINYLCARBAZOLE)-PROPYLAMINE COMPOSITE THIN-FILMS WITH ENHANCEDSENSITIVITY TO PROPYLAMINE VAPOR

The response (measured as a change in work function) of poly(N-vinylca rbazole) (PVCz) film towards propylamine (PrNH2) vapour can be optimiz ed by exposing the sensing layer to saturated PrNH2 vapour. Quartz cry stal microbalance, Fourier transform infrared spectroscopy and electro chemical measurements proved that PrNH2 absorbed from the gaseous phas e onto PVCz can be incorporated into its bulk structure by the electro chemical redeposition of PVCz. This procedure was used for the prepara tion of multilayered PVCz-PrNH2 composite films showing higher sensiti vity to PrNH2 than the single PVCz layers investigated previously.