One-dimensional chainlike Au-Ag core-shell nanostructure, self-assembly preparing method and SERS application

Abstract

The invention relates to a one-dimensional chainlike Au-Ag core-shell nanostructure, a self-assembly preparing method and SERS application. Nanoparticles of an Au core and Ag shell structure are synthesized through a liquid-phase synthesis method and a seed crystal growth method; the obtained nanoparticles of the core and shell structure are dispersed in a mixed solution of inorganic salt and ethyl alcohol; a certain quantity of alkaline solution is taken, and the mixed solution is added to be stirred and centrifuged to obtain the one-dimensional chainlike structure. By controlling the electrostatic mutual acting force between the core-shell nanoparticles, the one-dimensional nanometer structure of different Au core sizes and different Ag shell thicknesses is obtained through self-assembly; the method does not need the aid of any templates or surface active agents, the assembly process is simple, the Au core sizes and shell thicknesses are easy to regulate and control, products are easy to separate, the surface Raman enhancing effect of organic substance molecules is remarkable, a preparation system is green and environmentally friendly, no toxic or harmful solvent is added, prepared products are stable in performance, preparation cost is low, the application range is wide, repeatability is high, and large-scale preparation is easy.

Description

technical field [0001] The invention belongs to the field of preparation of Au and Ag nanoparticles, and relates to a preparation method of an Au-Ag core-shell nanostructure, in particular to a one-dimensional chain-like Au-Ag core-shell nanostructure with high surface Raman enhancement effect, self-assembled preparation Methods and SERS applications. Background technique [0002] As a kind of inelastic scattering spectrum, Raman spectroscopy analyzes the vibration and rotation of molecules through the scattering spectrum different from the incident light frequency, and can provide information about various normal vibration frequencies and vibrational energy levels inside the molecule. The signal of traditional Raman scattering spectroscopy is weak, and it often lacks high sensitivity as a means of information readout. [0003] Surface-enhanced Raman scattering (SurfaceEnhancedRamanscattering, SERS) refers to the phenomenon that the Raman signal of small molecules located o...

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Problems solved by technology

[0005] Although Au-Ag nanoparticles with core-shell structure have been reported in the literature, the preparation of one-dimensional chain-like Au-Ag core-shell nanostructures is still a difficult problem. Research on Nanostructures

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