Preparation method of silver dendrite/silicon tip nanocomposite with cactus structure

Abstract

The invention provides a method for preparing a silver dendrite / silicon needle tip nanocomposite material with a cactus structure. The silicon substrate is transferred into a mixed solution of hydrofluoric acid and silver nitrate to prepare silver dendrites; sputtering on the surface of silver dendrites Gold film; the silver dendrite sputtered gold film is transferred to the plasma-enhanced chemical vapor deposition reaction chamber for annealing, and alloy droplets will be formed after annealing, and used as a catalyst for vapor deposition to catalyze and induce the growth of silicon needle tips; the process of the present invention Simple, effective, easy to reduce production costs, and suitable for large-scale industrial production; the prepared cactus-structured silver dendrite / silicon tip nanocomposite has a unique three-dimensional structure, a large specific surface area, and can load a large amount of Active noble metal nanoparticles have broad application prospects in the fields of SERS sensing, catalysis, medical diagnosis, and adsorption materials.

Description

technical field [0001] The invention relates to a method for preparing a silver dendrite / silicon needle tip nanocomposite material with a cactus structure. Background technique [0002] Noble metal nanomaterials have attracted increasing attention due to their excellent properties in optics, electricity, catalysis, and sensing. Since scientists discovered that pyridine molecules adsorbed on the surface of rough silver electrodes have enhanced Raman scattering in the 1970s, silver nanomaterials have been widely used in preparation, modification, modification and Surface Enhanced Raman Scattering (SurfaceEnhanced Raman Scattering, SERS). developed rapidly. Silver dendrite, as a kind of noble metal material with unique structure, has been widely used in SERS sensing, catalysis, medical diagnosis and imaging due to its special hierarchical structure, large specific surface area, good catalytic and optical properties. . Studies have shown that although silver dendrites can be ...

AI Technical Summary

Problems solved by technology

However, most of these methods require expensive equipment, complicated operation, high production cost, and are not convenient for industrial production.

In addition, the prepared silver dendrite nanocomposite structure cannot obtain a large number of high-density needle tips, and the branch structures grafted on the surface are mostly short convex structures or columnar branches.

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