Method for preparing silicon nanotube by taking porous silicon as substrate

Abstract

The invention provides a method for preparing silicon a nanotube by taking porous silicon as a substrate, belonging to the field of new material preparation technologies. The preparation method comprises the steps of: immersing a cleaned planar silicon wafer into mixed aqueous solution of hydrofluoric acid and silver nitrate to carry out chemical reaction so as to convert the silicon wafer into a porous silicon wafer; immersing the porous silicon wafer into mixed aqueous solution containing fluorinated compounds and metal ions to carry out chemical reaction; taking out after reacting for a certain time; soaking by hydrochloric acid; and then washing by a large number of deionized water and drying by nitrogen so as to finally obtain the silicon nanotube in practical. Compared with the existing technologies of preparing silicon nanotubes, the method provided by the invention takes porous silicon as a silicon source and the chemical properties of the silicon element are fully utilized, so that the silicon nanotube can be prepared at relatively low temperature and normal pressure without the rigor conditions such as high temperature, high pressure, high vacuum and the like, and the preparation process is simple.

Description

technical field [0001] The invention relates to a method for preparing new materials, in particular to a method for preparing silicon nanotubes. Background technique [0002] The silicon nanotubular structure has semiconductor characteristics and a large band gap width, and has great application potential in silicon nano-optoelectronic devices, and also has great application prospects in the field of nanotechnology. At present, there are few reports on the preparation methods of silicon nanotubes. This is because silicon atoms are usually sp 3 Hybridization, a tetrahedral structure is formed between atoms, so the silicon nanomaterials currently reported are mostly silicon nanowires. Although computational chemistry methods can predict the existence of silicon nanotubes, there are still many difficulties in laboratory synthesis. [0003] Researchers from Hunan University designed a method for preparing silicon nanotubes in aqueous solution. They mixed pure SiO powder and de...

AI Technical Summary

Problems solved by technology

Its characteristic is that either high temperature conditions are required, or porous templates are required as supporting materials, the preparation process is complicated, and the reaction conditions are harsh.

Images