SYNTHESIS OF A POLYANILINE–SILVER NANOCOMPOSITE AND INVESTIGATION OF THE TEMPERATURE DEPENDENCE OF ITS ELECTRICAL CONDUCTIVITY
DOI:
https://doi.org/10.5281/Keywords:
Polyaniline, silver nanoparticles, nanocomposite, electrical conductivity, temperature dependence, sulphuric acid doping, electrochemical materials.Abstract
Polyaniline-based nanocomposites containing metallic nanoparticles have attracted significant attention due to their enhanced electrical, thermal, and electrochemical properties. In the present study, a silver nanoparticle–polyaniline nanocomposite (AgNPs–PANI–H₂SO₄) was synthesized through the adsorption of silver ions onto sulphuric acid-doped polyaniline followed by chemical reduction with ascorbic acid. The adsorption capacity of PANI–H₂SO₄ towards silver ions was determined to be 50 mg g⁻¹. The temperature dependence of the electrical conductivity of the resulting nanocomposite was investigated in the temperature range of 25–84°C under a constant applied voltage of 11 V. Experimental results showed that the electric current increased from 5 μA at 25°C to 21 μA at 84°C, indicating a significant increase in electrical conductivity with temperature. This behaviour is characteristic of semiconducting materials and can be attributed to enhanced charge carrier mobility, increased polaron and bipolaron transport, and improved electron transfer pathways provided by silver nanoparticles within the polymer matrix. The obtained results demonstrate that the AgNPs–PANI–H₂SO₄ nanocomposite is a promising temperature-sensitive conductive material with potential applications in sensors, thermistors, and electrochemical devices.
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