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Determination of Iodide via Direct Fluorescence Quenching at Nitrogen-Doped Carbon Quantum Dot Fluorophores

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journal contribution
posted on 14.01.2014, 00:00 authored by Haimin Zhang, Yibing Li, Xiaolu Liu, Porun Liu, Yun Wang, Taicheng An, Huagui Yang, Dengwei Jing, Huijun Zhao
The development of analytical methods for rapidly, sensitively, and selectively detecting iodide (I) in aqueous media is critically important because I is closely related to human health because of a number of diseases caused by the deficiency and radioactivity of I. In this work, we describe N-doped carbon quantum dots as the fluorophores for the direct determination of I fluorescence, achieving a detection limit of 10 μM with an analytical linear range up to 2.0 mM. The experimental results also demonstrate that the N-doped carbon quantum dot fluorophores possess high selectivity for I detection. The presence of nitrogen functional groups results in a positively charged carbon quantum dot surface, which is advantageous for the detection of I fluorescence because of the strong electrostatic interaction between carbon quantum dots and I. This work demonstrates the possibility of developing carbon quantum dot fluorophore-based fluorescence methods for the determination of other anions.