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Pure Appl. Chem., 2000, Vol. 72, No. 1-2, pp. 157-162

Processible nanomaterials with high conductivity and magnetizability. Preparation and properties of maghemite/polyaniline nanocomposite films

Ben Zhong Tang*, Yanhou Geng, Qunhui Sun, Xi Xiang Zhang and Xiabin Jing

Department of Chemistry, Hong Kong University of Science & Technology, Clear Water Bay, Kowloon, Hong Kong, China

Abstract: A versatile process employing anionic surfactants has been developed for the preparation of processible nanocomposite films with electrical conductivity and magnetic susceptibility. Maghemite (γFe2O3) nanoclusters (~10 nm in size) are coated with 4-dodecyl-benzenesulfonic acid, and polyaniline (PAn) chains are doped with 10-camphorsulfonic acid. The coated nanoclusters and doped polymers are soluble in common solvents, and casting the solutions readily gives free-standing nanocomposite films with nanocluster contents as high as ~50 wt %. The γFe2O3/PAn nanocomposites show high conductivity (82–237 S cm -1 ) and magnetizability (up to ~35 emu/g γFe2O3).