Effect of monomer concentration on interfacial synthesis of platinum loaded polyaniline nanocomplex using poly(styrene sulfonic acid)

Polyaniline-poly(styrene sulfate)-platinum (PANI-PSS-Pt) composites were prepared via interfacial synthesis. Polymerization of aniline and an incorporation of platinum (Pt) in polyaniline (PANI) were carried out simultaneously by using H₂PtCl₆ as an oxidizing agent in poly(styrene sulfonic acid) solution. To find an optimal synthesis condition, PANI-PSS-Pt composites were prepared with different mole ratio of aniline monomer and platinum precursor concentration. Resulting composites were compared with PANI-Pt-PSS composites prepared by using non-interfacial synthesis method. Doping degree and electronic structure of PANI-PSS-Pt composites were characterized by UV-Vis absorption spectroscopy. The morphological structures of PANI-PSS-Pt were evaluated by using scanning electron microscopy (SEM) and transmission electron microscopy (TEM). The electrochemical behaviors of PANI-PSS-Pt were investigated according to their characteristic current-voltage curves. PANI-PSS-Pt composite synthesized in 0.05 M monomer concentration showed smaller cluster size of composites and the highest current density value of 0.45 mA/mg.