Green Synthesized Silver and
Gold Nanoparticles for
Colorimetric Detection of Hg<sup>2+</sup>, Pb<sup>2+</sup>, and Mn<sup>2+</sup> in Aqueous Medium
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Abstract
In
this study, we report a simple and green method for the synthesis
of l-tyrosine-stabilized silver (AgNPs) and gold nanoparticles
(AuNPs) in aqueous medium under ambient sunlight irradiation. The
nanoparticles (NPs) are characterized by UV–visible spectroscopy,
high-resolution transmission electron microscopy (HR-TEM), Fourier
transform infrared spectroscopy (FT-IR), cyclic voltammetry (CV),
and dynamic light scattering (DLS) techniques. The size and shape
of the metal NPs could be controlled by changing the concentration
of the substrate, metal precursors, and pH of the medium. The synthesized
AgNPs are found to be highly sensitive to Hg<sup>2+</sup> and Mn<sup>2+</sup> ions with the detection limit for both ions as low as 16
nM under optimized conditions. However AuNPs are found to be sensitive
to Hg<sup>2+</sup> and Pb<sup>2+</sup> ions with a detection limit
as low as 53 and 16 nM, respectively. The proposed method was found
to be useful for colorimetric detection of heavy metal ions in aqueous
medium