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Preparation And Characterization Of PTCa/PEEK Pyroelectric Composite For Temperature Sensing

W.K.Sakamoto, G.P.Estevam

Ferroelectric ceramic/polymer composites were fabricated in the film form hot pressing Calcium modified lead titanate (PTCa) powder and poly(ether-ether-ketone) (PEEK) as polymer matrix. Different ceramic contents such as 40, 50 and 60 volume percent were used and composites films were obtained in the thickness range of 100 to 300m. To display pyroelectric activity the samples were poled by appropriated electric field. Using this composite as temperature sensors, a fire alarm was constructed. The alarm turn on when the sensor detects a signal variation corresponding to the frequency oscillation of fire light in the range of 5 Hz to 40Hz. Low density, mechanical resistance and high pyroelectric figure of merit(FOM) are some interesting characteristic of this composite, which allow to state that it can be used in photo-thermal spectroscopy.