Self-Assembly of Gold Nanoparticles on Gold Core-Induced Polypyrrole Nanohybrids for Electrochemical Sensor of Dopamine

Abstract

Gold core-induced polypyrrole nanohybrids (Au-PPyNHs) were successfully synthesized via in situ chemical oxidation polymerization of pyrrole molecules, and their structure was directly con¯rmed and characterized by scanning electron microscopy, transmission electron microscopy, Fourier transform infrared spectroscopy and X-ray di®raction. Furthermore, gold nanoparticles (AuNPs) were assembled onto the as-prepared Au-PPyNHs by electrostatic interaction to fabricate the nanohybrids of Au-PPyNH-Au. The created Au-PPyNH-Au nanohybrids was immobilized onto glassy carbon electrode and applied to construct dopamine (DA) sensor. We found that the fabricated sensor with Au-PPyNH-Au nanohybrids is highly speci¯c probe for sensing DA. The Au-PPyNH-Au based DA sensor has a linear detection range from 1 M to 0.321 mM and a detection limit of 0.32 M.

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“…Conducting polymers (CPs) are suitable host matrices due to their advantages of permitting a facile electronic charge ow through the polymer matrix in electrochemical processes. [1][2][3] Polypyrrole (PPy), is one of the most promising CPs because of its ease of synthesis, good redox property, high conductivity, and excellent environmental stability. 4 The presence of conjugated double bonds along the backbone of the polymer chain, unusually low ionization potentials and high electron affinities are basic requirements for the special electrical properties of PPy.…”

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