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A novel approach to the construction of core–shell gold–polyaniline nanoparticles

Uniform core–shell gold–polyaniline (Au–PANI) nanoparticles were successfully fabricated by in situ polymerization of aniline using poly(N-isopropylacrylamide)-co-poly(acrylic acid) (PNIPAM-co-PAA)/AuNP hybrid microgel particles as a template. TEM images gave direct evidence of the core–shell nanostructure of Au–PANI particles, which were composed of gold nanoparticles as the core and polyaniline as the shell. The shell thickness of as-prepared core–shell Au–PANI nanoparticles can be easily tuned by controlling the reaction time. A possible mechanism for the formation of core–shell Au–PANI nanostructures was proposed. This novel synthetic method may be extended to the synthesis of other core–shell nanostructures with diverse functionality and high colloidal stability.