2024-03-26

Carbon Quantum Dots for Rapid and Ratiometric FluorescenceDetermination of Hypochlorite

Herein, we present a method for rapid ratiometric ffuorescence detection of hypochlorite (ClO−) by carbon quantumdots (CDs). Glutathione (GSH) was utilized as the starting material for the synthesis of CDs through a hydrothermal process. Amaximum ffuorescence intensity at an emission wavelength of 435 nm was observed under an excitation wavelength of 335 nm. Theinner fflter effect (IFE) of curcumin (CCM) on CDs could be utilized to reduce the ffuorescence intensity of CDs at 435 nm, whilean emission peak emerged at 540 nm. ClO− could rapidly oxidize CCM due to its oxidizing properties, which weakened the IFE,leading to a decrease in the ffuorescence intensity of CCM at 540 nm, while the ffuorescence intensity of CDs at 435 nm is restored.In addition, CDs exhibited excellent selectivity and sensitivity in the ffuorescence detection of ClO−, and a substantial sensitivity inthe detection of ClO− was established within a concentration range of 1−1500 μM with a limit of detection of 36.54 nM. The spikedrecovery tests of tap water, swimming pool water, and milk samples showed the feasibility of using CDs for the ratiometricffuorescence detection of ClO− in real samples.

Shao K, Guo L, Zhong Y, et al. Carbon Quantum Dots for Rapid and Ratiometric Fluorescence Determination of Hypochlorite[J]. ACS Applied Nano Materials, 2024, 7(8): 8645-8654.