Selective detection of Fe3+ by Ag2S QDs and construction of the IMPLICATION gate

Abstract

Several studies have demonstrated that Ag2S QDs are promising near-infrared II-emitting nanoprobes. They Ag2S QDs can be used in the fields of bio-imaging, fluorescence detection and photodetectors. In this work, we achieved the first successful construction of a dual-input logic gate IMPLICATION gate based on the specific detection of Fe3+ by silver sulfide quantum dots and the reduction of Fe3+ by ascorbic acid. The Ag2S QDs were successfully prepared from glutathione and silver nitrate and characterized by fluorescence spectroscopy analysis, XPS analysis, and transmission electron microscopy TEM analysis. The prepared Ag2S QDs can achieve selective detection of Fe3+ with a detection limit of LOD of 0.15 mM. This work provides a new method for the detection of Fe3+.

Keywords

• Ag2S QDs
• Fe3+
• Fluorescence sensor
• IMPLICATION gate
• Selective detection