Pyroelectric Parameters Measurement of Infrared Sensor Based on PANICSA/ PVDF/BaTiO3 Composite Films

Abstract

An infrared sensor based on composite of polyaniline/polyvinylidene fluoride (PANI/PVDF)/ barium titanate (BaTiO 3) with different weight percentages (25, 50, 70 and 100) of BaTiO 3 has been fabricated. PANI doped with camphor sulfonic acid (CSA) was prepared chemically. Electrical measurements such as electrical conductivity and pyroelectric current and coefficient of these composites were performed. It was found that the pyroelectric coefficient increases with increasing of the weight percentage of BaTiO 3. The behavior of electrical conductivity of PANI-CSA/PVDF/BaTiO 3 composite films with different weight percentages of BaTiO 3 was followed up the percolation theory. The percolation threshold value of PANI-CSA/PVDF/BaTiO 3 composite films was found at 25 wt.% of BaTiO 3. The conductivity of the composite films was increased from 4.08×10-8 S/cm 0 wt.% of BaTiO 3 to 8.84×10-6 S/cm at 100 wt.% of BaTiO 3. The pyroelectric coefficient values were enhanced from 2.35×10-5 to 1.27×10-3 C/m 2˚C at 0 wt.% and 100 wt.% of BaTiO 3 , respectively.