Preparation Of Fluorescent Noble Metal Nanomaterials And Application Of Sensors

The special physical and chemical properties of precious metal nanomaterials have aroused great interest among researchers.Nowadays,precious metal nanomaterials with various morphologies,controllable synthesis,functionalization and surfacing have emerged one after another.Therefore,they are widely used in the analysis and detection of heavy metal ions,biomarkers and bioimaging,sensors,catalysts and other fields.Polymetallic nanomaterials have more properties in the properties of single metal nanomaterials,such as wide specific surface area and attractive catalytic activity.From the above advantages,in this era of scientific and technological development,polymetallic nanomaterials have been used as decorative materials in the field of sensors,which provides a good platform for the sensitivity,response speed and detection limit of chemical analysis methods.In this paper,noble metal nanomaterials were synthesized by template method combined with solvothermal method and applied to heavy metal ion detection,bioimaging,temperature sensor and catalyst.The main contents and innovations of this paper are as follows:?1?Spherical silver-like nanoparticles with high fluorescence properties and smooth surface were prepared by a simple template synthesis method using polyvinylpyrrolidone k-30?PVP?as template agent.It has excellent fluorescence characteristics and unique morphology,and it is not measurable in the future of biological imaging.It is also precise and highly reproducible in determining Cd²⁺in real samples such as natural mineral water,tap water,milk and sewage with recoveries ranging from 90 to 111%,it shows that this method has a promising future in practical samples containing Cd²⁺.?2?Bimetallic nanoclusters have attracted much attention due to their excellent electrical,optical and catalytic properties.In this paper,a new method is proposed to synthesize copper/gold nanoclusters?Cu/Au BNCs?with high fluorescence properties in one step under suitable environmental conditions,using glutathione?GSH?as reducing agent and protective agent to prevent agglomeration of the formed nanoparticles.The resultant Cu/Au BNCs are uniformly dispersed,with an average diameter of 1.5 nm,and it exhibits emission at 450 nm with excitation at 380 nm.Interestingly,the fluorescence signal of the Cu/Au BNCs is sensitive responsive to the environmental temperature,and it shows good sensitivity in the range of20–70°C?F=-23.96T+3149.2?R=0.94??.Furthermore,it was found that the fluorescence of Cu/Au BNCs was quenched selectively by Cr³⁺,and a detection method was further developed with detection linear range from 50nM to 1 mM(F=-174.85[Cr³⁺]+1686.69?R=0.98?)and high sensitivity?LOD=10 nM,S/N=3?.?3?The design of palladium-based nanostructures has good prospects in various applications.In the fourth chapter of this paper,a one-step synthesis of PdCuAu nanoparticles in aqueous phase was reported.PdCuAu NPs have attracted much attention owing to their unique synergistic electronic effect,optical and catalytic performance.As a temperature sensor,PdCuAu NPs are very sensitive to fluorescence intensity changes in the temperature range from4 to 95°C,which is due to its unique optical properties.PdCuAu NPs obtained by us can also be used as peroxidase-like catalysts because of their good catalytic performance.It can catalyze TMB rapidly in the presence of hydrogen peroxide and oxidize it to visible blue product?oxTMB?.Based on its unique peroxidase-like properties,this study used PdCuAu NPs colorimetric platform detection of hydrogen peroxide and glucose.The linear ranges of hydrogen peroxide and glucose were 0.1-300?M and 0.5-500?M,respectively,and the detection limits?LOD?were 5 nM and 25 nM,respectively.This simple and rapid method provides a good prospect for the detection of H₂O₂ and glucose in practical applications.