Zhang Meng-Yao, Yi Feng-Ying, Guo Qing-Zhong, Luo Fa-Liang, Liu Lan-Jun, Guo Jun-Fang
Hubei Key Laboratory of Plasma Chemistry and Advanced Materials, School of Materials Science and Engineering, Wuhan Institute of Technology, Wuhan 430205, China.
State Key Laboratory of High-efficiency Utilization of Coal and Green Chemical Engineering, Ningxia University, Yinchuan, 750021, China.
Dalton Trans. 2023 Mar 14;52(11):3300-3307. doi: 10.1039/d3dt00119a.
Detection of Fe(III) and Cu(II) in water is highly desirable because their abnormal levels can cause serious harm to human health and environmental safety. In this work, a ratiometric luminescence sensing platform based on lanthanide-based silica nanoparticles was constructed for the detection of Fe and Cu ions. The terbium-silica nanoparticles (named SiO@Tb) with dual-emission signals were successfully prepared by grafting Tb ions onto trimellitic anhydride (TMA) functionalized silica nanospheres. It can serve as a ratiometric fluorescent probe for the detection of Fe and Cu ions in water with the green emission of Tb ions as a response signal and the blue emission of silica nanospheres as the reference signal. Significantly, an easy-to-differentiate color change for visual detection was also realized. SiO@Tb shows high sensitivity even in very low concentration regions towards the sensing of Fe and Cu with low detection limits of 0.75 μM and 0.91 μM, respectively. Moreover, the mechanism for the luminescence quenching of SiO@Tb was systematically investigated, and was attributed to the synergetic effect of the absorption competition quenching (ACQ) mechanism and cation exchange. This study demonstrates that SiO@Tb can be employed as a promising fluorescent probe for the detection of Fe and Cu ions, and the combination of lanthanide ions with silica nanoparticles is an effective strategy to construct a ratiometric fluorescent sensing platform for the determination of analytes in environmental detection.
检测水中的铁（III）和铜（II）非常必要，因为它们的异常含量会对人类健康和环境安全造成严重危害。在这项工作中，构建了一种基于镧系元素二氧化硅纳米颗粒的比率发光传感平台，用于检测铁离子和铜离子。通过将铽离子接枝到偏苯三酸酐（TMA）功能化的二氧化硅纳米球上，成功制备了具有双发射信号的铽-二氧化硅纳米颗粒（命名为SiO@Tb）。它可以作为一种比率荧光探针，以铽离子的绿色发射作为响应信号，二氧化硅纳米球的蓝色发射作为参考信号，用于检测水中的铁离子和铜离子。值得注意的是，还实现了易于区分的颜色变化用于视觉检测。即使在极低浓度区域，SiO@Tb对铁和铜的传感也显示出高灵敏度，检测限分别为0.75 μM和0.91 μM。此外，系统研究了SiO@Tb发光猝灭的机制，其归因于吸收竞争猝灭（ACQ）机制和阳离子交换的协同效应。这项研究表明，SiO@Tb可作为一种有前景的荧光探针用于检测铁离子和铜离子，镧系离子与二氧化硅纳米颗粒的结合是构建用于环境检测中分析物测定的比率荧光传感平台的有效策略。
