| Abstract
| - A simple and versatile method for the synthesis of a wide range of polyaniline (PANI)-based 1D and 2D goldnanostructures of uniform size distribution with high colloidal stability is demonstrated. All the nanostructures weresynthesized from oligoaniline-coated gold nanoparticle precursors. The nanostructures include nanowires of varioussizes, nanoplates, and flower-like nanoparticles. These nanowires showed a pH-dependent shape transformation.Needle-like aggregates of Au/PANI were formed as the pH of the nanowire solution changed to 2.5. At higher pH(10.2), nanowires converted into spherical nanoparticles. Core−shell particles of Au/PANI composites have beenachieved by the reversal of the pH of the nanowire from 10.2 to 2.9. The morphology of the nanostructures was studiedby TEM and SEM. FTIR, UV−vis, XRD, and LDI MS were utilized for the characterization of the chemical compositionof the nanostructures. A mechanism for the nanowire growth is proposed.
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