Resumen

MOLINA, Gustavo A. et al. Development and evaluation of a portable sensor for Hg²⁺ detection by AuNP green synthesis using Sargassum spp aqueous extract. Mundo nano [online]. 2023, vol.16, n.31, 69774.  Epub 04-Sep-2023. ISSN 2448-5691.  https://doi.org/10.22201/ceiich.24485691e.2023.31.69774.

The present manuscript’s objective is to develop a sensor prototype for measuring mercury (Hg2+) in an aqueous solution. An electrochemical platform based on screen-printed carbon nanotube electrodes (CNT-SPE) and gold nanoparticles (NPs-Au) synthesized using a green synthesis method with an aqueous extract of Sargassum spp. For this, the characterization of the NPs-Au was carried out by ultraviolet-visible (UV-Vis), infrared (TF-IR), X-ray diffraction (XRD) and scanning electron microscopy (SEM) spectroscopy. The nanoparticles have sizes between 80-100 nm and an organic coating that allows them a synergy when conjugated with oxidized/activated CNT-SPE. Subsequently, the NPs-Au were used to modify the CNT-SPE through the drop-casting method and thus assemble a novel electrochemical sensor for the measurement of Hg2+, whose validation and ability to measure was demonstrated using differential pulse voltammetry (DPV). Detection limits of 2.38 𝜇M and quantification of 3 𝜇M were obtained. The results show that the developed platform is a fast, efficient and portable alternative for the measurement of Hg2+.

Palabras llave : electrochemical sensor; gold nanoparticles; mercury; sargassum; screen-printed electrodes.

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