Cu2+-Triggered Carbon Dots with Synchronous Response of Dual Emission for Ultrasensitive Ratiometric Fluorescence Determination of Thiophanate-Methyl Residues

• DOI: 10.1021/acs.jafc.9b04720
• Publication Date: 2019-10-16T21:46:20Z
• Authors: Yong Han; Weixia Yang; Xueli Luo; Xie He; Ying Yu; Chunhua Li; Wenzhi Tang; Tianli Yue; Zhonghong Li
• Keywords: Nanosensor; Carbon fibers

Copper ion (Cu2+)-triggered carbon dots (CDs/Cu) with dual emissions were utilized to develop a ratiometric fluorescence sensor for ultrasensitive detection of inert thiophanate-methyl (TM). TM could be recognized by CDs/Cu through π–π stacking and chelate Cu2+ metal coordination, inducing synchronous fluoresent quenching the emission based on excited state intramolecular proton transfer ligand-to-metal charge transfer. The ratio (F416/F481) linearly responded in concentration 0.10–20.00 μmol/L an ultralow limit 2.90 × 10–6 μmol/L. A response enhanced specificity toward presented remarkable capability anti-interference complex matrices. exhibited satifactory accuracy precision practical applications recoveries 88.33–101.09% relative standard deviations 1.61–5.06%, demonstrating fluorescent nanosensor detecting pesticides residues