Method for preparing carbon nano-tube by in situ chemical vapour deposition method with nickel/titanium as catalyst

Abstract

The invention discloses a method for preparing carbon nano-tubes by a method of nickel / titanium catalyst situ chemical vapor deposition. The process is that nickelous nitrate hexahydrate and titanium powder are taken as raw materials to prepare catalyst precursor NiO / Ti by a method of deposition and precipitation according to certain mass ratio; NiO / Ti is put into a tube typed furnace and synthesized into nano-tubes by situ chemical vapor deposition method under different reaction conditions, wherein, hydrogen is taken as reducing gas, nitrogen or argon is taken as carrier gas and methane is taken as reaction gas. The method of the invention has the advantages that the content of catalyst nickel can be determined accurately and the yield of the carbon nano-tubes can be controlled; the carbon nano-tubes obtained by the method has comparatively good dispersity and even size; the preparation process of catalysts and the product carbon nano-tubes is simple and feasible.

Description

technical field [0001] The invention relates to a method for preparing carbon nanotubes by using a nickel / titanium catalyst in-situ chemical vapor deposition method. It belongs to the carbon nanotube preparation technology. Background technique [0002] Since their discovery, carbon nanotubes have received close and extensive attention because of their excellent mechanical, electrical, and thermal properties. Carbon nanotubes are widely used in hydrogen storage, field emission devices, electromagnetic absorbing materials and other fields. In particular, carbon nanotubes are one of the ideal reinforcements for lightweight and high-strength metal matrix composites. At present, the methods for preparing carbon nanotubes mainly include: arc discharge method, laser evaporation method and chemical vapor deposition method, etc. Among them, the chemical vapor deposition method is considered to be It is one of the most promising techniques for growing carbon nanotubes. The synthes...

AI Technical Summary

Problems solved by technology

The synthesis of carbon nanotubes by chemical vapor deposition usually requires the use of transition metals (Fe, Co, Ni) as catalysts. Usually, the introduction of catalysts during the synthesis of carbon nanotubes by chemical vapor deposition on metal substrates often uses the spray method , which is easy to cause the interface pollution between the matrix and the reinforcement, which is not conducive to the preparation and performance improvement of metal matrix composites. However, in recent studies, nickel / aluminum and nickel / copper catalysts have been successfully used on aluminum matrix, In situ synthesis of carbon nanotubes on a copper base, this catalyst preparation method makes the synthesized carbon nanotubes thermodynamically stable in the matrix, free from interfacial impurity contamination, and can significantly improve the bonding of the two-phase interface in the material, but the nickel / In situ synthesis of carbon nanotubes by chemical vapor deposition using titanium as a catalyst, there is no research report yet

Images