A NOVEL TGS 70/30 VDF-TRFE COPOLYMER COMPOSITE-MATERIAL FOR PYROELECTRIC SENSORS/

A novel thin composite film has been fabricated in which both phases a re electroactive. Triglycine sulphate crystals (5 mum in size), grown by rapid quenching and freeze drying of an aqueous solution, were mixe d (10% w/w) with 70:30 vinylidene fluoride:trifluoroethylene copolymer in butanone. When spin cast, the material possessed a pyroelectric co efficient of (60+/-2)muCm-2K-1 and a figure of merit (pyroelectric coe fficient/square-root(relative permittivity x dielectric loss)) of 150 muCm-2K-1, some 18% and 35% larger, respectively, than that of the pur e copolymer.