Selective detection of mercury ions based on tin oxide quantum dots: performance and fluorescence enhancement model

文献类型： 外文期刊

第一作者： Liu, Jianqiao

作者： Liu, Jianqiao;Bai, Yu;Shi, Jingcheng;Yu, Qing;Liu, Jifei;Yang, Jiayu;Fu, Ce;Liu, Jianqiao;Zhang, Qianru

作者机构：

期刊名称：JOURNAL OF MATERIALS CHEMISTRY C （ 影响因子：7.393； 五年影响因子：6.853 ）

ISSN： 2050-7526

年卷期： 2021 年 9 卷 26 期

页码：

收录情况： SCI

摘要： The superiority of fluorescence-based methods in the metal ion detection is well established; however, the quantum dot (QD) fluorescent probes currently used for mercury ions (Hg2+) have many limitations, such as a narrow detection range and environmental toxicity. In this work, environment-friendly tin oxide (SnO2) quantum dots were prepared and applied as a fluorescent sensor for the selective determination of Hg2+. The synthesized SnO2 QDs showed excellent performance in Hg2+ ion detection, with a broad linear range of 10(-2)-10(5) mu M and a low detection limit of 5 nM. Remarkably, SnO2 QDs illustrated high selectivity to Hg2+ ions without interference from other metal ions. Furthermore, the mechanism of fluorescence enhancement in SnO2 QDs was based on the ratio of non-radiative electrons, and the density of active Sn vacancies was further explained. A mathematical model is proposed to interpret the mechanism of the adsorptive process during Hg2+ detection, thereby providing a quantitative understanding of the fluorescence sensing principle of semiconductor QDs. This work demonstrates the promising application of SnO2 QDs for convenient, highly sensitive and low-cost determination of Hg2+ ions in experimental and actual conditions.

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