Structural and electrical properties of HCl–polyaniline–Ag composites synthesized by polymerization using Ag-coated (NH₄)₂S₂O₈ powder

Abstract

Ag nanoparticles were sputter-deposited on ammonium persulfate ((NH₄)₂S₂O₈) powder to obtain (NH₄)₂S₂O₈−Ag powder, which was used to synthesize the HCl-doped polyaniline−Ag (HCl−PANI−Ag) composite via a polymerization procedure. The Ag nanoparticles were dispersed in the HCl−PANI matrix, and their sizes mainly ranged from 3 to 6 nm. The Ag nanoparticles did not affect the structure of emeraldine salt in the composite, and they increased the ordered crystalline regions in the HCl−PANI matrix. The HCl−PANI−Ag composite had a conductivity of (6.8 ± 0.1) S/cm, which is about four times larger than that of the HCl−PANI. The charge transport mechanism in the composite is explained by the three-dimensional Mott variable-range hopping (3D-Mott-VRH).

Keywords

hydrochloric-acid-doped polyaniline / silver nanoparticles / composite / structure / conductivity

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