Green Synthesis and Characterization of Silver Nanoparticles (AgNPs) and L-cysteine-capped AgNPs with Foeniculum vulgare seed extract for Colorimetric Hg2+ Detection

Öz

In this study, silver nanoparticles (AgNPs) and L-cysteine-capped AgNPs were synthesized separately using Foeniculum vulgare seed extract as the reducing agent and L-cysteine as the capping agent, which were characterized by ultraviolet–visible spectrophotometer (UV–vis), Fourier Transform Infrared spectrophotometer (FT-IR), X-ray diffractometer (XRD), and transmission electron microscopy (TEM). The utilization of the synthesized nanomaterials as colorimetric sensors for the detection of Hg2+ ions was also investigated. In this context, it was determined that L-cysteine-capped AgNPs exhibited better performance in the colorimetric Hg2+ detection in regards to sensitivity, selectivity, and applicability in real samples. It was observed that the colorimetric detection method was based on the disappearance of the brown color of the nanomaterial-contained colloidal solution and thus the decrease in the LSPR peak intensity. The method of the colorimetric Hg2+ detection with L-cysteine-capped AgNPs showed the good regression coefficient with the minimum detection limit of 0.36 μM in the linear Hg2+ concentration range of 1.0-10 μM, which indicated the competitive results compared to the latest reported colorimetric sensors in the literature. According to the obtained results, it has been concluded that the studied method enables to detection of Hg2+ ions colorimetrically via L-cysteine-capped AgNPs in a sensitive, selective, applicable in real samples, cheap, and easy way.

Anahtar Kelimeler

• L-cysteine-capped AgNPs
• green synthesis
• Foeniculum vulgare
• Hg2+ detection
• colorimetric sensor

Kaynakça

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