Abstract
A water-dispersed ratiometric fluorescent probe to detect Cu2+ was designed and synthesized by self-assembling 2, 6-pyridinedicarboxylic acid (DPA) coordinated Tb3+ (Tb-DPA) and silicon nanoparticles (SiNPs). The sensor exhibited dual fluorescence emissions upon excitation at 280 nm in aqueous media, with a reference signal at 440 nm (SiNPs) and a response signal at 546 nm (Tb3+). Upon adding Cu2+, the fluorescence emission of Tb3+ significantly decreased, while that of SiNPs remained negligibly unchanged. There was a strong linear correlation between F440/F546 and Cu2+ concentration, ranging from 2 to 12 μM, with a low detection limit of 0.61 μM. The probe exhibited excellent sensitivity, selectivity, anti-interference capability, and stability for detecting Cu2+. It is very easy to observe fluorescence alterations with the naked eye when exposed to UV lamp light, making it advantageous for visual detection. The sensors were successfully utilized for detecting Cu2+ in actual water samples, exhibiting recoveries ranging from 95.20 % to 104.81 %. Meanwhile, the test paper sensor was successfully prepared for the visual and highly sensitive detection of Cu2+.
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