Polyaniline(PANI) microwires containing CdS nanoparticles have been prepared by introducing hydrogen bonding and/or electrostatic interaction between mercaptocarboxylic acid capped CdS nanoparticles and PANI. SEM and TEM proved them to be wire-like structures. PL spectra of the PANI/CdS complex is blue-shifted by 14 nm compared to CdS nanoparticles in N-methylpyrrolidinone(NMP).

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Polyaniline (PANI)–Fe3O4 nanoparticles were obtained using a novel method: aniline dimer–COOH assisted polymerization. The synthetic strategy involved two steps: first, the composite of magnetic nanoparticles modified with aniline dimer–COOH was synthesized by a chemical precipitation method. Then aniline monomer and oxidant were added to create PANI–Fe3O4 nanoparticles. The structure of Fe3O4 nanoparticles capped with aniline dimer–COOH was characterized by Fourier transform infrared, ultraviolet–visible, x-ray photoelectron spectroscopy and x-ray diffraction analyses. Transmission electron microscope images of the PANI–Fe3O4 nanocomposite showed that the Fe3O4 nanoparticles were well dispersed in PANI matrices. The PANI–Fe3O4 composite was characterized by means of FTIR, XPS and XRD analyses. The PANI–Fe3O4 nanoparticles were found to be superparamagnetic. The hysteresis loop at room temperature showed high saturated magnetization (Ms = 21 emu g−1) and a low coercive force (μc = 0).