| INORGANIC MATERIALS AND CERAMIC MATRIX COMPOSITES |
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| Rapid Detection of Hg2+ by a Ratiometric Fluorescence Sensing Method Based on Gold Nanoclusters and Carbon Quantum Dots |
| LIU Feiyan1,2, ZHAO Shengliang1,2, LAI Xuandi3, LU Zhiyang1,2, LI Linfeng1,2, HAN Peigang1,2,*, CHEN Liqiong2,3,*
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1 College of Applied Sciences, Shenzhen University, Shenzhen 518061, Guangdong, China
2 College of New Materials and New Energies, Shenzhen Technology University, Shenzhen 518118, Guangdong, China
3 Analysis and Testing Center, Shenzhen Technology University, Shenzhen 518118, Guangdong, China |
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Abstract Mercury ion (Hg2+) is a contaminant of strong carcinogenicity, non-biodegradability and hypertoxicity, thus it is significant to design a rapid detection method of Hg2+ to protect the human health and earth environment. In this work, a radiometric fluorescence sensor, via a single excitation wavelength and dual emission wavelength, was developed by mixing gold nanoclusters (AuNCs) and carbon quantum dots (CDs) for rapid naked-eye screening and detection of Hg2+, where the AuNCs with red fluorescence were prepared by hydrothermal synthesis method, and the CDs with blue fluorescence were prepared by microwave-assistant method with high quantum yield (85%). Based on the high-affinity metallophilic Hg2+-Au+ interactions, the fluorescence emission peak of AuNCs at 670 nm could be quenched significantly, while the reference fluorescence intensity of CDs at 420 nm was basically not affected by Hg2+in AuNCs-CDs. There is a linear relationship between the ratiometric fluorescence signal (I670/I420) of AuNCs-CDs and the concentration of Hg2+ (0.005—1 mg·L-1) with the limit of detection of 1.5 μg·L-1. As the concentration of Hg2+ rising, the fluorescence color of AuNCs-CDs could be distinguished by bare-eyes (from pink to blue) under UV lights. This developed method was not only anti-interferential to other metal ions, but also feasible in the detection of actual samples, such as river water, rice and cabbage, with the recovery rate of Hg2+ in the range of 84.5%—105.1%. Therefore, AuNCs-CDs can be used to construct an ideal ratiometric fluorescent sensor for the rapid and sensitive detection of Hg2+ to the further applications on the food safety and environmental detection.
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Published: 10 November 2023
Online: 2023-11-10
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| Fund:Key Field (Rural Revitalization) Project of Colleges and Universities in Guangdong Province (2020ZDZX1009) and Basic Research Project of Shenzhen Natural Science Foundation (JCYJ20190813103601660). |
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2023, Vol. 37 
