Green Synthesis of Fluorescent Ag Nanoclusters for Detecting Cu2+ Ions and Its "Switch-On" Sensing Application for GSH. (15th March 2021)

• Record Type: Journal Article
• Authors: Shang, Yunpeng; Gao, Hui; Li, Lei; Ma, Chaoqun; Gu, Jiao; Zhu, Chun; Yang, Zichen; Wang, Chengwei; Zhang, Ye; Chen, Guoqing
• Other Names: Ming Li-June Academic Editor.
• Is Part Of: Journal of spectroscopy. Volume 2021(2021)
• Publication Date: 2021-03-15
• Subjects: Spectrum analysis -- Periodicals; 543.505
• DOI: 10.1155/2021/8829654
• Languages: English
• ISSNs: 2314-4920

Abstract

Abstract : Herein, we prepared the L-histidine- (His-) protected silver nanoclusters (Ag NCs) by the microwave synthesis method. The synthesis process was rapid, facile, and environmentally friendly. Under 356 nm excitation, the as-prepared Ag NCs exhibited the blue fluorescence, and the fluorescence emission peak was located at 440 nm. The Ag NCs could successfully detect trace copper (Cu 2+ ) ions in the aqueous solution and the limit of detection (LOD) was as low as 0.6 pM. Interestingly, the Ag NCs showed a different pH-dependent selectivity for both Cu 2+ and iron (Fe 3+ ) ions with no responses to other heavy metal ions. Furthermore, the as-fabricated fluorescent sensing system was utilized to detect glutathione (GSH, the LOD was 0.8 nM) by using the "switch-on" fluorescence recovery of Ag NCs through adding glutathione (GSH) to the Cu 2+ -Ag NCs solution.