| Coinage metal nanoparticles(copper,silver and gold)have unique physical and chemical properties.They have important application value in the fields of Surface Enhanced Raman Scattering,biosensor,heterogeneous catalysis and printable electronic technology.In order to solve the problem that silver and copper nanoparticles are easy to be oxidized,the preparation of gold stabilized silver and copper alloy nanoparticles can not only weaken the oxidation sensitivity of the two metal nanoparticles,but also fine regulate the local surface plasmon resonance wavelength and catalytic activity of the particles,which has important application value.Based on the in-depth study of the Brust-Schiffrin reaction mechanism,this reaction was extended to the preparation of coinage metals and their alloy nanoparticles,and the following research results were obtained:1.The Brust-Schiffrin reaction was improved according to Lewis acid-base theory.The formation rate of[TOA]_m[MBr_n]complex in organic phase was effectively improved by adding Brˉor Clˉion into the aqueous phase of two-phase reaction.Silver and copper nanoparticles were successfully synthesized by"one pot method",and Au-Ag and Au-Cu binary and Au-Ag-Cu ternary copper alloy nanoparticles with adjustable atomic ratio were prepared.The synthesized nanoparticles can be used for solution assembly of functional structures.2.The SERS substrates assembled by Au-Ag and Au-Cu alloy nanoparticles were prepared and characterized.It was confirmed that the Au-Ag alloy substrate had good SERS properties,and its SERS properties increased with the increase of Ag content,while the SERS properties of Au-Cu alloy substrate decreased with the increase of Cu content.3.The application of the composite structure of Au-Cu alloy nanoparticles and ZnO nano films in photocatalytic degradation of dye molecules was explored.SERS spectra were used to detect the destruction of the molecular conjugate structure of dye molecules in the process of photooxidation. |
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