Fe(III) Detection by Multicolor Carbon Dots as Fluorometric Probes

Taking an industrial standpoint, the recognition of Fe(III) as a heavy metal ion can exert a profound impact on the industry. In this research, we synthesized carbon dots from a novel and local green source by hydrothermal method. Afterwards, characterization tests, like dynamic light scattering, zeta potential sizer, atomic force microscopy, Fourier transform infrared spectroscopy, X-ray powder diffraction, elemental analysis, and transmission electron microscopy have been done. After investigation of physicochemical properties, the proposed novel nanobiosensor based on multicolor carbon dots can detect Fe(III) with ultra-low detection limit compared with other studies. The designed nanobiosensor does not identify other ions, confirming its detection specificity. Besides, this nanobiosensor can detect Fe(III) ion in two different conditions, tap water and cysteine solution as real samples. This accurate and sensitive detection of Fe(III) in different conditions can play an impressive role in industries in the near future.</em>