²Istituto di Acustica "O. M. Corbino" - Area di Ricerca di Tor Vergata - Via del Fosso del Cavaliere,100 - 00133 ROMA

Electrical and SAW sensors have been performed by spinning p -conjugated polymer membranes on appropriate substrates. Polymers from monosubstituted acetylenes

H-Cē C-R (R=C₆H₅,; C₁₃H₈OH ; CH₂OH ; CH₂N(CH₃)₂) and polymers of the general formula [-M(PBu₃)₂-Cē C-C₆H₄-C₆H₄-Cē C-]_n (M = Pt, Pd) were syntesized and investigated. These polymers can be easily deposited to give homogeneous membranes sensitive to R.H. variations. The responses of different devices are compared. Their behaviour is dependent on the R pendant group of the polymeric chains, on the doping agents and on the chain metal in the [-M(PBu₃)₂-Cē C-C₆H₄-C₆H₄-Cē C-]_n polymers. The sensors exhibit different sensitivities in different R.H. ranges. An appropriate choice of sensors can therefore better cover the complete R.H. range from 0 to 90%.