Detection of Cu2+ and arginine by orange-red fluorescent nano-switch based on Mn-doped carbon dots
CHEN Xiu-yang1, PAN Li-zhi1, SHENG Tong-fan1, ZHOU Xing-ping2, ZHANG Hui2
1. Coating-Division, Shanghai Waigaoqiao Shipbuilding Co., Ltd., Shanghai 200137, China; 2. College of Chemistry, Chemical Engineering and Biotechnology, Donghua University, Shanghai 201620, China
Abstract: Manganese-doped carbon dots (Mn-CDs) that emitting orange fluorescence are synthesized by a one-step hydrothermal method with o-phenylenediamine and anhydrous manganese chloride as precursors,and their morphology,functional groups,surface and optical properties are characterized.The results show that Mn-CDs presents a spherical shape with an average particle size of 6.75 nm in the range of 3.0-8.0 nm and a narrow size-distribution.In addition,the surface of Mn-CDs is rich in water-soluble functional groups such as —COOH and —NH2,making them have a good dispersion in water.Under the irradiation with the optimized excitation wavelength of 440 nm,the best emission wavelength of Mn-CDs is 599 nm,and the fluorescence is very stable.Effects of different ions on the fluorescence of Mn-CDs are measured in phosphate solution with a pH of 7.4,and it is found that only Cu2+ can significantly quench the fluorescence of Mn-CDs,while arginine can significantly recover the quenched fluorescence.There are good linear relationships between the quenching and the concentration of Cu2+,and between the recovering and the concentration of arginine,indicating that the synthesized Mn-CDs can be used as a platform for detecting Cu2+ and arginine,with the lowest detection limits of 0.234 μmol·L-1 and 0.65 μmol·L-1,respectively.
陈修阳, 潘立志, 盛同范, 周兴平, 张晖. 基于锰掺杂碳点的橘红色荧光纳米开关检测Cu2+和Arg的研究[J]. 现代化工, 2022, 42(11): 249-255.
CHEN Xiu-yang, PAN Li-zhi, SHENG Tong-fan, ZHOU Xing-ping, ZHANG Hui. Detection of Cu2+ and arginine by orange-red fluorescent nano-switch based on Mn-doped carbon dots. Modern Chemical Industry, 2022, 42(11): 249-255.
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