Self-assembly of S,N-codoped Ce/Cu bimetallic nanoparticles for fluorescence and visual detection of hexavalent chromium

IF 5.3 2区化学 Q1 CHEMISTRY, ANALYTICAL

Microchimica Acta Pub Date : 2024-10-21 DOI:10.1007/s00604-024-06715-4

Hanyu Yang, Kaijing Yang, Rong Tang, Hui Chen, Wei Liu, Xiupei Yang

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Abstract

Ce₂(SO₄)₃ was doped into 4,6-diamino-2-mercaptopyrimidine (DAMP)-encapsulated copper nanoclusters (CuNCs) via a facile, rapid, low-temperature, and green self-assembly synthesis method to obtain fluorescent S,N-codoped Cu/Ce-DAMP nanoparticles (S,N-codoped Cu/CeNPs) for the detection of Cr(VI). The prepared Cu/CeNPs exhibit double emission peaks at 470 nm and 610 nm. The fluorescence emission at 610 nm is significantly enhanced due to the aggregation-induced emission (AIE) effect, and the quantum yield is as high as 20.19%. The fluorescence emission at 610 nm can be selectively quenched by Cr(VI) due to the internal filter effect (IFE) and dynamic quenching, whereas the weak fluorescence at 470 nm remains almost stable. On this basis, a fluorescence assay method for Cr(VI) was established, with good linearity in the concentration range 0.5–120 µM and a detection limit (LOD) of 134 nM. Using a smartphone to take photos of the fluorescence signals changes caused by Cr(VI) rapid visual detection is achieved with a linear range of 10–130 μM and a LOD of 2.35 μM. The proposed method was successfully applied to the detection of Cr(VI) in actual water samples.

Graphical abstract

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用于荧光和目视检测六价铬的 S、N-掺杂 Ce/Cu 双金属纳米粒子的自组装

通过一种简便、快速、低温和绿色的自组装合成方法，在4,6-二氨基-2-巯基嘧啶（DAMP）封装的铜纳米团簇（CuNCs）中掺入了Ce2(SO4)3，从而获得了用于检测六价铬的荧光S,N-掺杂Cu/Ce-DAMP纳米粒子（S,N-掺杂Cu/CeNPs）。制备的 Cu/CeNPs 在 470 nm 和 610 nm 处呈现双发射峰。由于聚集诱导发射（AIE）效应，610 nm 处的荧光发射明显增强，量子产率高达 20.19%。由于内部滤光器效应（IFE）和动态淬灭作用，610 纳米波长处的荧光发射可被六（六）铬选择性淬灭，而 470 纳米波长处的微弱荧光则基本保持稳定。在此基础上，建立了六价铬的荧光检测方法，该方法在 0.5-120 µM 浓度范围内线性关系良好，检测限 (LOD) 为 134 nM。利用智能手机拍摄六价铬引起的荧光信号变化，实现了快速的视觉检测，线性范围为 10-130 μM，检测限为 2.35 μM。该方法已成功应用于实际水样中六价铬的检测。

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来源期刊

Microchimica Acta 化学-分析化学

CiteScore

9.80

自引率

5.30%

发文量

410

审稿时长

2.7 months

期刊介绍： As a peer-reviewed journal for analytical sciences and technologies on the micro- and nanoscale, Microchimica Acta has established itself as a premier forum for truly novel approaches in chemical and biochemical analysis. Coverage includes methods and devices that provide expedient solutions to the most contemporary demands in this area. Examples are point-of-care technologies, wearable (bio)sensors, in-vivo-monitoring, micro/nanomotors and materials based on synthetic biology as well as biomedical imaging and targeting.