Synthesis Of Laser-induced Gold-platinum Nanorods And Their Applications In Biocatalysis

Precious metal gold nanorods(Au NRs)are widely used in drug delivery,in vitro detection and photothermal imaging.These are mainly derived from Au NRs with regulatable localized surface plasmon properties,photothermal properties and highly efficient nano-enzyme properties.The nano-enzyme properties of gold-platinum nanocomposites based on Au NRs have attracted wide attention due to their advantages of high temperature resistance,strong acid and alkali resistance and easy storage.However,there is a huge challenge in the detection process,that is,the material synthesis time is long and the catalytic efficiency is low.The laser induction method can not only effectively control the uniform growth of platinum on the gold surface,but also accelerate the transfer of surface electrons and improve its catalytic efficiency.Based on the above discussion,how to rapidly synthesize gold-platinum nanocomposites,construct a complete electron transport channel on the surface of nanocomposites,and effectively improve the peroxidase properties.The main works of this thesis are as follows:(1)Laser-induced synthesis of gold-platinum nanorods.Compared with the traditional hydrothermal method,the laser induction method can not only shortened the preparation time of gold-platinum nanorods,but also control the deposition of platinum nanoparticles on the gold surface.Through testing,it was found that the gold-platinum nanorods synthesized by laser induction have strong surface plasmon resonance coupling.According to theoretical calculations,the catalytic performance of gold-platinum nanorods is 4.2 times and 2.1 times that of Au NRs and platinum nanoparticles,respectively.Based on the synergistic effect of its surface-enhanced Raman properties and nano-enzyme properties,ultra-sensitivity detection of hydrogen peroxide is achieved.(2)The gold-platinum nanorods surface-modified with CTAB were loaded onto the surface of the graphene oxide(GO)by electrostatic interaction.Since the surface of the GO is rich in oxygen-containing functional groups and its sheet-like structure,it has a large surface area for loading the metal nanoparticles,and can be used for a medium for hot electron transport.The complex peroxidase properties were subsequently tested and it was found that ascorbic acid has an inhibitory effect on the catalytic process.Based on the inhibition of nano-enzyme by ascorbic acid,the detection of ascorbic acid in beverages is achieved.