Preparation of ZnS Quantum Dots/Alginate Composite Films Based on Electrodeposition and Their Applications on Detection
On the basis of electrodeposition,a new method has been developed to in situ synthesize zinc sulfide(ZnS)quantum dots(QDs)and directly prepare ZnS QDs/alginate composite films on electrodes.The method shows a range of benefits,such as the good controllability,the mild conditions,and the convenient and eco-friendly process.After the electrodeposition,a smooth and homogeneous ZnS QDs/zinc alginate composite film has been generated on the surface of electrode,which exhibits clear blue fluorescence under excitation of 302 nm UV light.Transmission electron microscopy observation reveals that there are relatively uniform sized nanoparticles in the ZnS QDs/zinc alginate composite film,and their average particle size is 3.0 nm.The UV-Vis absorption spectrum of the ZnS QDs/zinc alginate composite film exhibits absorption peak at 280 nm,which is attributed to the typical absorption peak of ZnS QDs.The photoluminescence spectrum of the ZnS QDs/zinc alginate composite film shows a clear emission peak at 420 nm,which agrees with the emission peak of ZnS QDs.The ZnS QDs/zinc alginate composite films having specific shapes and fluorescence patterns can be directly fabricated by utilizing the spatial selectivity of the electrodeposition and the fluorescence property of ZnS QDs.Noteworthily,the ZnS QDs/zinc alginate composite film shows the ability for both fluorescence detection and electrochemical detection.Therefore,it can be expected that the ZnS QDs/alginate composite film prepared by electrodeposition is promising for applications in the dual-mode detection and novel dual-mode detectors and sensors.
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