A novel dual-emission fluorescent probe for ratiometric and visual detection of Cu2+ ions and Ag+ ions

• DOI: 10.1007/s00216-022-03930-x
• Publication Date: 2022-02-02T03:02:41Z
• Authors: Jiang Wu; Runyang Li; Siyu Liu
• Keywords: Ions; Spectrometry, Fluorescence; Gold; 01 natural sciences; Carbon; Fluorescent Dyes; 0104 chemical sciences

In this work, the biomolecule glutathione was used to prepare cyan fluorescent carbon dots (GSH@CDs) by a hydrothermal method. The GSH@CDs were adopted as the scaffolds to synthesize fluorescent gold nanoclusters (GSH@CDs-Au NCs) with two independent emission peaks at 430 nm and 700 nm. A fluorescent method for the Cu2+ and Ag+ ion assay was established based on the fluorescence quenching or enhancement at 700 nm of GSH@CDs-Au NCs. The fluorescent test strips were successfully prepared for visual detection of Cu2+ ions and Ag+ ions based on GSH@CDs-Au NCs. In addition, GSH@CDs-Au NCs were found to possess well peroxidase-like activity.