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Green synthesized dextrose and maltose-reduced silver nanoparticles (Ag-NPs) were investigated for colorimetric sensing of metal ions at different concentrations and reaction time. The synthesized AgNPs were characterized using UV-Visible spectroscopy (UV-Vis), Fourier transform Infra-red spectroscopy (FTIR), transmission electron microscopy (TEM) and dynamic light scattering (DLS). Both maltose and dextrose-reduced Ag-NPs were highly sensitive and selective to Hg 2+ and Fe 2+ ions over other metal ions at higher metal ion concentration. This was accompanied with a colour change from yellowish solution to colourless for Hg 2+ ions and from yellowish solution to greenish for Fe 2+

international journal of electrochemical science

Sugar-Reduced Gelatin-Capped Silver Nanoparticles with High Selectivity for Colorimetric Sensing of Hg2+ and Fe2+ Ions in the Midst of Other Metal Ions in Aqueous Solutions.