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

Abstract

The invention provides a preparation method of a silver dendrite and silicon tip nanocomposite with a cactus structure. The method comprises the steps that a silicon substrate is transferred into a mixed solution of hydrofluoric acid and silver nitrate to prepare a silver dendrite; gold film sputtering is conducted on the surface of the silver dendrite; and the silver dendrite which is subjected to the gold film sputtering is transferred to a chemical vapor deposition reaction chamber enhanced through plasmas, annealing is conducted, and alloy droplets are formed after annealing and serve as catalysts for vapor deposition to catalyze and induce the growth of silicon tips. According to the preparation method of the silver dendrite and silicon tip nanocomposite with the cactus structure, the method is simple in process and effective to implement, the production cost is conveniently reduced, and the method is suitable for the large-scaled industrial production; and the prepared silver dendrite and silicon tip nanocomposite with the cactus structure has a unique three-dimensional structure and a larger specific surface area and can load a large number of active nobel metal nano-particles, and therefore the preparation method of the silver dendrite and silicon tip nanocomposite with the cactus structure has the wide application prospect in the fields such as SERS sensing, catalyzing, medical diagnosis and adsorbing 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 developed in terms of preparation, modification, modification and surface enhanced Raman scattering (Surface Enhanced Raman Scattering, SERS). rapid development. 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...

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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