Amplified electrochemical signal taking polyanline as sensing interface compared to polyindole carboxylic acid

• Amplified electrochemical signal produced by polyaniline modified electrode.
• Amplified electrochemical signal produced by chemically produced AuNPs.
• Results produced can prove to be a new avenue for making best sensing interface.

In present work, nanocomposite of gold nanoparticles–polyaniline (AuNPs/PANI) produces amplified electrochemical signal as compared to gold nanoparticles–polyindole carboxylic acid (AuNPs/Pin5COOH) modified gold electrode (AuE). Present work also compares gold nanoparticles prepared by using green (extracts of Elettaria cardamomum) and chemical synthesis. The characterization studies of the gold nanoparticles prepared from both methods were performed using dynamic light scattering (DLS) and UV–vis spectroscopy. The surface functionalization of modified electrodes was characterized by cyclic voltammetry (CV) and scanning electron microscopy (SEM). Comparison of signal amplification was performed using cyclic voltammetry (CV) and electrochemical impedance spectroscopy (EIS). Voltammetric approach reveals that gold nanoparticles prepared from chemical synthesis resulted in higher electrochemical signal than gold nanoparticles prepared from green technology. Comparisons between two hybrid nanocomposites can prove to be a new avenue for making best sensing interface for biosensor fabrication.

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