Synthesis And Properties Of Conductive Polymer/Inorganic Nanocomposites

Ployaniline(PANI) and Polypyrrole(PPy) are considered to be the most prospective in application among the various conjugated conductive polymers because its low price, simple method of synthesizing and high conductivity. The study emphasized on finding out a convenient and suitable way by which TiN, CrN nanoparticles with attractive electrical, wear-corrosion resistant property and ITO powder with attractive optical and electrical functions can be intercalated into PANI and PPy to synthesize new types of organic-inorganic composites such as PPy/TiN nanocomposites, PPy/CrN nanocomposites, PANI/CrN nanocomposites, PPy/ITO composites and PANI/ITO composites. The correlative reports have not been seen in all of literatures.Nanosized TiN, CrN powders were prepared by the ammonalysis method. The as-prepared TiN, CrN nanoparticles were modified to disperse in the pyrrole monomers. The PPy/TiN, PPy/CrN nanocomposite were synthesized by in-situ polymerization method. X-ray powder diffraction (XRD), transmission electron microscopy (TEM), Fourier transform infrared spectrum (FT-IR) and four-probe measurements were adopted for the characterization of the as-synthesized composite. The result indicated that PPy was coated on the surface of the TiN, CrN nanoparticles and the composites showed good electrical property.PANI/CrN nanocomposite of core-shell structure was prepared by in situ chemical polymerization in ice bath. X-ray powder diffraction (XRD), Transmission electron microscopy (TEM), Fourier transform infrared spectrum (FT-IR) and four-probe measurements were adopted for the characterization of the as-synthesized composite. The result indicated that the conductivity of the PANI/CrN nanocomposite was increased by one order compared to that of the pure PANI and PANI/TiN nanocomposite which has been reported by documentation. The PANI/CrN nanocomposite showed good conductivity.The ITO intersecting-rods were prepared by hydrothermal method , ITO nanoparticles were prepared by chemical precipitation and InCl₃ and SnCl₃ were used as raw materials. PPy/ITO composites and PANI/ITO intersecting-rods composites were obtained by in situ polymerization. The interaction between ITO and the polymer matrix was characterized by XRD and FTIR. The microstructure of ITO, PPy/ITO composites and PANI/ITO intersecting-rods composites were observed by TEM and SEM. The conductivity of the as-synthesized composites was measured by four-probe measurements. The result indicated that PPy/ITO composites and PANI/ITO intersecting-rods composites were successfully prepared, and the composite also showed good electrical property. The conductivity of PPy/ITO composites were connected with the microstructure of ITO particles.