| Abstrakt: |
Silver nanoparticles (AgNPs) were synthesized via a biosynthetic method involving Zingiber montanum (Z. montanum) flower extracts. Various concentrations of silver nitrate (AgNO3) ranging from 2 to 4 mM were tested to determine the optimum concentration for AgNP production. The formation of AgNPs was visually confirmed by observing the colour of the solution, which changed from light brown to dark brown. The tests performed included UV‒Visible spectroscopy (UV‒Vis), Fourier transform infrared spectroscopy (FTIR), transmission electron microscopy (TEM), zeta potential analyses, X-ray diffraction (XRD), energy-dispersive X-ray spectroscopy (EDS), thermogravimetric analyses (TGA), and cyclic voltammetry. The UV‒Vis spectrum showed absorption peaks at 445, 442, and 447 nm. The FTIR spectrum showed that the constitutive functional groups were good reducing agents. A TEM analysis of the AgNPs revealed that they were spherical. The zeta potentials of the AgNPs were − 31.6, − 30.4, and − 32.3 mV. XRD revealed the face-centred cubic (FCC) crystal structure for the AgNPs. EDS showed that the elemental composition of the AgNPs peaked at 3 keV, with the weight percentages of Ag of 16.62, 54.46, and 17.15% at 2, 3, and 4 mM, respectively. TGA showed good thermal stability upon heating, with final weights of 49.03, 51.18, and 63.05%. In addition, compared with that of the unmodified electrode, the conductivity of the modified electrode was higher at 100 mV. Moreover, the modified electrodes showed results proportional to the scan rates of 50, 100, 200, and 400 mV/s. [ABSTRACT FROM AUTHOR] |
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