Excellent fluorescence detection of Cu2+ in water system using N-acetyl-L-cysteines modified CdS quantum dots as fluorescence probe. (15th July 2021)

• Record Type: Journal Article
• Authors: Zhao, Rongjun; Wang, Zhezhe; Tian, Xu; Shu, Hui; Yang, Yue; Xiao, Xuechun; Wang, Yude
• Is Part Of: Nanotechnology. Volume 32:Number 40(2021)
• Publication Date: 2021-07-15
• Subjects: CdS QDs -- fluorescence probe -- Cu2+ detection -- high selectivity -- fluorescence quenching; Nanotechnology -- Periodicals; Nanotechnology -- Periodicals; Nanotechnology; Publications périodiques; Nanotechnologies; Periodicals; 620.5
• DOI: 10.1088/1361-6528/ac1016
• Languages: English
• ISSNs: 0957-4484

Abstract

Abstract: View of the negative influence of metal ions on natural environment and human health, fast and quantitative detection of metals ions in water systems is significant. Ultra-small grain size CdS quantum dots (QDs) modified with N-acetyl-L-cysteines (NALC) (NALC-CdS QDs) are successfully prepared via a facile hydrothermal route. Based on the changes of fluorescence intensity of NALC-CdS QDs solution after adding metal ions, the fluorescence probe made from the NALC-CdS QDs is developed to detect metal ions in water systems. Among various metal ions, the fluorescence of NALC-CdS QDs effectively quenched by the addition of Cu 2+, the probe shows high sensitivity and selectivity for detecting Cu 2+ in other interferential metal ions coexisted system. Importantly, the fluorescence intensity of NALC-CdS QDs changes upon the concentration of Cu 2+, the probe displays an excellent linear relationship between the fluorescence quenching rate and the concentration of Cu 2+ in ranging from 1 to 25 μ M. Besides, the detected limitation of the probe towards Cu 2+ as low as 0.48 μ M. The measurement of Cu 2+ in real water sample is also carried out using the probe. The results indicate that NALC-CdS QDs fluorescence probe may be a promising candidate for quantitative Cu 2+ detection in practical application.