Preparation And Analytical Application Of Nanostructured Perovskites

CsPbBr3 QDs are a novel class of photoelectric materials with unique optical properties.Compared with conventional QDs,CsPbBr₃ QDs have higher quantum yields,narrower line width and adjustable fluorescence emission characteristics.Therefore,CsPbBr₃ QDs material can be used as a powerful fluorophore for the construction of fluorescence analysis platform.In the field of photocatalysis,traditional semiconductor materials have much lower light-using efficiency than they actually require because of the large band gap.Therefore,the design and synthesis of new visible light photocatalysts has become a hot topic in the field of photocatalysis.The all-inorganic perovskite material has unique photoelectric characteristics such as high absorption coefficient,long life,high charge carrier mobility,and flexible band gap adjustability.These excellent properties make CsPbBr₃ QDs an ideal choice for photocatalyst materials.In this paper,all-inorganic perovskite QDs were synthesized at room temperature.Through a series of characterization methods,the morphology,composition and optical properties of QDs were explored.The trace quenching effect of QDs was used to detect TNP,and the feasibility of this method in the qualitative and quantitative detection of explosives was further explored.In addition,Ag-CsPbBr₃ nanocomposites were prepared by photoreduction method and used as photocatalysts.The morphology,chemical composition and optical properties of the materials were analyzed by a series of characterizations.The photocatalytic degradation of Ag-CsPbBr₃ nanocomposites was determined by photocatalytic degradation of dyes.The specific research content is as follows:A simple and sensitive analytical method based on all inorganic perovskite QDs material was designed and used for the detection of nitroaromatic explosives such as TNP.First,all inorganic perovskite QDs material was prepared by a supersaturation recrystallization method.Second,the CsPbBr₃ QDs were used as fluorescent probes to detect TNP.The experimental results showed that the concentration of TNP showed a good linear relationship with the fluorescence quenching of QDs.Finally,the feasibility of qualitative and quantitative analysis of TNP based on CsPbBr₃ QDs was investigated.The experimental results show that the method has high sensitivity and the CsPbBr₃QDs have good fluorescence selective properties for TNP and are not interfered by other components in the explosive.The photoreduction method was used to synthesize Ag-CsPbBr₃ nanocomposites.The structure and properties of the materials were characterized by a series of methods.The test results show that the silver nanoparticles are successfully deposited on the monoclinic phase CsPbBr₃ QDs,while the crystal structure of the CsPbBr₃ QDs does not change.The photocatalytic activity of Ag-CsPbBr₃ nanocomposites was studied using MG dye as a photocatalytic degradation substrate.The experimental results show that the prepared Ag-CsPbBr₃ nanocomposites have excellent photocatalytic activity.In the experiment,we also investigated the effects of solvent acidity,catalyst amount,and ion interference on the photocatalytic performance of Ag-CsPbBr₃.