Coordination-Driven Self-Assembled Ag2S Quantum Dots/Polymer Composite Film and Fluorescence Sensing to Benzaldehyde

Abstract

A novel sensor based on Ag2S/chitosan films was prepared via a coordination-driven self-assembled method. Experiments demonstrated that Ag2S was inert to chitosan film. Structural, and sensing property studies were realized by FTIR, DSC, SEM, and fluorescence analysis. DSC showed good crystallization after manipulation, showing that the Ag2S QDs were uniformly distributed in the film, leading to a good fluorescence property. The fluorescence of the films was selective to benzaldehyde. The linear detection on benzaldehyde concentration by the fluorescence method can be established was from 0 to 108 mg/L. The films could be quenched because of the electron transfer between benzaldehyde and Ag2S QDs. It would therefore be developed as an optical sensor.