PLAČEK Tomáš VSB - Technical University of Ostrava

Measurement and Evaluation of the Electrical Conductivity of PANI and PANI/Kaolinite/Titanium Dioxide Pressed Pellets – Study of Load Sensor


Polyaniline (PANI) is one of the widely studied conducting polymers due to its light weight, low cost, excellent environmental stability and reversible acid-base switching of its electrical conductivity. Composites based on conducting polymers, are often used as sensors. This research deals with specific conductivity measurement of PANI and PANI-based composite containing titanium dioxide (TiO2). The layered silicate kaolinite was used as carrier of TiO2 nanoparticles (KATI). Pure PANI samples and PANI/KATI composite samples were prepared in powder form using simple one-step process. Pure PANI was prepared from aniline sulphate (precursor) and ammonium peroxodisulphate (oxidizing agent). PANI/KATI composite was prepared in a similar way but in the presence of KATI powder without preliminary intercalation of anilinium into KATI. Pressed pellets were prepared at room temperature under pressure 28 MPa. The dependence of electrical current flowing through the pellet on mechanical load was used to study the possibility of using pellets as load sensors. Electrical current was recorded during loading and unloading the pellets with constant weights. It was found that PANI/KATI pellets exhibit more stable response to the loading and unloading than PANI/kaolinite pellets and pure PANI pellets. Special attention has been paid to to the thermal pre-treatment of KATI composite and to the amount of TiO2. ACKNOWLEDGEMENTS: This work was supported by the Ministry of Education, Youth and Sports of Czech Republic (project reg. no. SP2014/37).