Ratiometric fluorescent detection of Hg2+ using dual-emissive carbon dots in an immiscible system

IF 5.3 2区化学 Q1 CHEMISTRY, ANALYTICAL

Microchimica Acta Pub Date : 2025-03-26 DOI:10.1007/s00604-025-07097-x

Fei Shen, Xiangzhi Meng, Wenxi Zhang, Jing Sun, Juan Hou

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Abstract

A facile one-pot hydrothermal method was established to simultaneously prepare blue and yellow emissive carbon dots (BCDs and YCDs) in an immiscible system. This method eliminated the need for complex purification steps. The resulting BCDs and YCDs exhibited uniform sizes and excellent fluorescence properties. A ratiometric fluorescent probe based on B/YCDs was designed for the rapid and selective detection of Hg²⁺ with a detection limit of 15 nM. The probe was capable of reliable detection in real water samples with recoveries of 92.42 ~ 110.02%. To further enhance practicality, we incorporated fluorescent papers and hydrogels for visual Hg²⁺ detection, making it ideal for on-site applications. Additionally, a smartphone-based sensing platform, integrating RGB value analysis, was also developed for accurate Hg²⁺ detection. This work represents a significant advancement in the field by providing a user-friendly and cost-effective approach for sensitive on-site detection of hazardous mercury pollution.

Graphical Abstract

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建立了一种简便的一锅水热法，可在不相溶体系中同时制备蓝色和黄色发射性碳点（BCDs 和 YCDs）。该方法无需复杂的纯化步骤。制备出的 BCDs 和 YCDs 大小均匀，具有优异的荧光特性。基于 B/YCDs 设计的比率荧光探针可快速、选择性地检测 Hg2+，检测限为 15 nM。该探针能够可靠地检测真实水样中的 Hg2+，回收率为 92.42% 至 110.02%。为了进一步提高实用性，我们还加入了荧光纸和水凝胶来进行可视化 Hg2+ 检测，使其成为现场应用的理想选择。此外，我们还开发了一个基于智能手机的传感平台，其中集成了 RGB 值分析功能，用于准确检测 Hg2+。这项工作为现场灵敏检测有害汞污染提供了一种用户友好型和具有成本效益的方法，是该领域的一项重大进展。

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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.