Said Ali Akbar, Muhammad Hasan, Muhammad Nazar, Ilham Zulfahmi, Edy Miswar, Muhammad Iqhrammullah, Zulkarnain Jalil
Fluorescent carbon quantum dots (SA-CQDs) from Syzygium aromaticum were synthesized via carbonization-assisted ultrasonication, exhibiting an average size of 3.314 nm and strong blue fluorescence at 440 nm (excitation: 350 nm) with a quantum yield of 12.61 %. FTIR and UV–vis confirmed oxygen-containing functional groups, enhancing metal ion interactions. SA-CQDs showed selective fluorescence quenching for Fe3+ (89.7 %) and Cd2+ (84.8 %). Sensitivity analysis revealed linearity (R2 = 0.988 for Fe3+, R2 = 0.994 for Cd2+) with detection limits of 0.515 μM and 0.403 μM, respectively. High recovery rates (95.10–100.23 %) in real water samples confirmed reliability for water quality monitoring. © 2025 The Authors
Department of Aquaculture, Faculty of Marine and Fisheries, Universitas Syiah Kuala, Banda Aceh, 23111, Indonesia; Department of Chemistry Education, Faculty of Teacher Training and Education, Universitas Syiah Kuala, Banda Aceh, 23111, Indonesia; Department of Fisheries Resources Utilization, Faculty of Marine and Fisheries, Universitas Syiah Kuala, Banda Aceh, 23111, Indonesia; Postgraduate Program of Public Health, Universitas Muhammadiyah Aceh, Banda Aceh, 23123, Indonesia; Department of Physics, Faculty of Mathematics and Natural Sciences, Universitas Syiah Kuala, Banda Aceh, 23111, Indonesia
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