In work, we described a cost-effective and environmentally friendly
technique for green synthesis of colloidal silver nanoparticles from an
aqueous extract of fresh leaves of Acacia melanoxylon and their
application as a dopamine and hydrogen peroxide sensor. The prepared
silver nanoparticles were characterized using UV-Vis absorption
spectroscopy, X-ray diffraction (XRD), scanning electron microscopy
(SEM), zeta-potential analysis, thermogravimetric analysis (TGA),
differential scanning calorimeter (DSC), etc. This method was found to
be cost-effective, eco-friendly when compared to that of chemical and
physical methods of nanoparticle synthesis. Silver nanoparticles
modified carbon paste electrode (CPE) was fabricated for the detection
of dopamine and hydrogen peroxide. The fabricated electrode showed an
excellent sensitivity towards the oxidation of both dopamine (DA) and
hydrogen peroxide (H2O2) in 0.1 M phosphate buffer (PBS) solution at pH
7. The effects of scan rate, and concentration of the modifier and
analyte were studied by the cyclic voltammetric technique. The result
exhibits good electrocatalytic activity, diffusion-controlled process
and linear increase in peak current with different concentrations of
dopamine and hydrogen peroxide
