Method for converting nano graphite into one-dimensional carbon nano fiber by laser irradiation

Abstract

The invention discloses a method for converting nano graphite into one-dimensional carbon nano fiber by laser irradiation, comprising the following steps: 1), selecting a laser energy density reference value according to conversion physical parameters of nano graphite, selecting a laser through the laser energy density reference value, and setting laser process parameters; 2), using the data of step 1) to acquire an optimal laser energy density set value of a one-dimensional carbon nano wire, selecting reasonable laser process parameters by using the optimal laser energy density set value, and using a protective gas to prevent graphite oxidation so as to produce one-dimensional nano carbon fiber; the carbon nano fiber is controllably industrialized; the defects due to chemical methods and other methods are avoided; no waste is caused ,and manpower and material resources are saved.

Description

technical field [0001] The invention relates to a method for transforming one-dimensional carbon nanofibers by laser irradiation of nanometer graphite. Background technique [0002] Carbon is one of the most common and important elements on the earth. For a long time, people believed that there are only two forms of carbon: graphite and diamond. Since Smalley discovered fullerene in 1985 and Juno Iijima discovered carbon nanotubes in 1991, carbon nanomaterials have attracted extensive attention for their excellent electrical, magnetic, optical and mechanical properties. , biosensing and other fields have been widely used. The unique structure and excellent performance make it have many potential application values. [0003] So far, carbon nanomaterials with various shapes and structures have been prepared by various methods, such as carbon nanotubes, graphite nanocones, hollow carbon spheres, carbon nanocapsules, carbon nanorods, carbon nanoneedles, carbon nano fiber. An...

AI Technical Summary

Problems solved by technology

The carbon nanofibers prepared by the chemical vapor deposition method have a large diameter, and the yield is small, it is difficult to grow continuously and accompanied by a certain amount of carbon black; the carbon nanofibers prepared by the flame method are difficult to control the shape and arrangement of the carbon nanofibers; the electrospinning method The carbon nanofiber skin-core structure is serious, the mechanical properties are poor, and the surface is rough

At the same time, the preparation conditions of these processes are relatively harsh, such as the need to add catalysts, the preparation temperature is difficult to control, the production cycle is long, accompanied by the formation of additional products, polluting the environment, etc.

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