Laser & Optoelectronics Progress, Volume. 58, Issue 14, 1404002(2021)
Highly Sensitive Detection of Copper Ions by Reduced Glutathione Modified Gold Nanocluster Fluorescence Sensor
Reducing glutathione (GSH) is used as a stabilizer to synthesize gold nanoclusters (GSH-AuNCs) with good stability and water solubility. The specific static quenching effect of Cu 2+ on GSH-AuNCs fluorescence in aqueous solution is used to establish a rapid and highly sensitive detection method for Cu 2+. GSH-AuNCs emits strong fluorescence at 602 nm under the excitation light of 396 nm wavelength. When Cu 2+ exists in the GSH-AuNCs system, the fluorescence signal is quenched to a certain extent, and the greater the concentration of Cu 2+, the more significant the effect, the linear relationship between the fluorescence emission intensity of GSH-AuNCs and the concentration of Cu 2+ is established based on this, and the quantitative detection of Cu 2+ is realized. Under optimized conditions, the fluorescence emission signal of GSH-AuNCs showes a good linear relationship with Cu 2+concentration between 16.7 and 5000 nmol·L -1, and the detection limit is 7.4 nmol·L -1. At the same time, the recovery rate of the actual water sample is detected, the recovery rate is between 92.9% and 107.9%.
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Zhenping Liu, Rong Jiang, Kejing Pang. Highly Sensitive Detection of Copper Ions by Reduced Glutathione Modified Gold Nanocluster Fluorescence Sensor[J]. Laser & Optoelectronics Progress, 2021, 58(14): 1404002
Category: Detectors
Received: Oct. 19, 2020
Accepted: Nov. 12, 2020
Published Online: Jul. 6, 2021
The Author Email: Liu Zhenping (nping305@126.com)