The fabrication of a hybrid fluorescent nanosensing system and its practical applications via film kits for the selective determination of mercury ions

• Published in: Spectrochimica acta. Part A, Molecular and biomolecular spectroscopy Vol. 320; p. 124677
• Main Authors: Sanko, Vildan, Şenocak, Ahmet, Yeşilot, Serkan, Tümay, Süreyya Oğuz
• Format: Journal Article
• Language: English
• Published: Elsevier B.V 05-11-2024
• Subjects: Environmental samples; Fluorescent sensor; Hybrid optical material; Mercury determination; Nanoparticles; Nanoparticles; Fluorescent sensor; Mercury determination; Environmental samples; Hybrid optical material
• ISSN: 1386-1425
• DOI: 10.1016/j.saa.2024.124677

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•New highly fluorescent nanosensor system was prepared and characterized.•New hybrid nanomaterial was applied to determine mercury ions in real samples.•The analysis conditions were investigated and optimized for the newly developed method.•The new nanosensor system was embedded into PCL film to obtain the RGB-based practical application kit in a solid state.•The validation of method was performed with ICP-MS and spike/recovery analysis.
Heavy metal ions especially mercury exposure have severe toxic effects on living organisms and human health. Therefore, easy, accessible, and accurate determination strategies for the selective specification of mercury ions are essential for numerous disciplines. In the presented paper, new hybrid fluorescent iron oxide nanoparticles labeled with carbazole and triazole units (CT-IONP) were prepared via surface modification for the spectrofluorimetric determination of Hg2+ in environmental samples. The structure of the new sensing system is characterized via various spectroscopic, thermal, and microscopic techniques. Under optimized conditions, the hybrid system is not only used in fully water media but also highly fluorescent which led to the “turn-off” response towards Hg2+ ion in the presence of various competitive species. The presented sensing system was successfully used for the determination of Hg2+ ions in the wide linear working range (0.02–10.00 µmol.L−1) at nanomolar levels, where the limit of detection and quantification were calculated as 7.38 and 22.14 nmol.L−1. Importantly, the practical application of hybrid material was applied by CT-IONP embedded polycaprolactone (PCL) polymer film kits. The bluish color of fabricated film kits was instantly and dramatically turned colorless-dark patterns after the addition of Hg2+ ions, which resulted in convenient and rapid film test kits for selective detection.