Method and device for continuously synthesizing diamond membrane by radiating carbon nanotube with strong laser

Abstract

The invention relates to a method and device for continuously synthesizing a diamond membrane by radiating a carbon nanotube with strong laser. The device for continuously synthesizing the diamond membrane is characterized by consisting of a laser generating system, a working system and an auxiliary system. Laser emitted by a high-power pulse laser device is reflected and split by a spectroscope to generate a laser beam G1 and a laser beam G2, the laser beam G1 is focused at an appropriate position over the upper surface of a substrate, and carbon nanotube powder in a solution is gasified and ionized momentarily by absorbing laser energy to generate a large quantity of high-speed plasmas; and meanwhile, a momentary high-temperature and high-pressure micro-zone is formed on the surface of the substrate under the compounding action of laser G2, and the high-speed plasmas bombard the surface of the substrate to form the diamond membrane. According to the method and the device, the problems of low synthesis efficiency, special reaction condition, difficulty in operating equipment and high equipment price are solved, continuous synthesis of the diamond membrane at the macroscopically normal temperature and under the macroscopically normal pressure is realized innovatively, and a large-thickness high-purity diamond membrane is obtained.

Description

technical field [0001] The invention relates to the field of artificially manufacturing diamond films, in particular to a method and a device for continuously preparing diamond films by irradiating carbon nanotubes with strong laser light. Background technique [0002] Nanodiamond has attracted extensive attention due to its excellent mechanical, thermal, optical and chemical properties. With the deepening of understanding, nanodiamonds have been practically applied in the fields of metal coating, lubricating oil, magnetic recording system and medicine. Since the laser can heat, melt, gasify or undergo phase change in a very short time, the research on the synthesis of nano-diamond by laser method is going on at home and abroad. In 1992, Ogale et al. applied the strong laser-induced liquid-solid interface reaction method to diamond synthesis, that is, the ruby ​​laser was used to irradiate a graphite target soaked in benzene, and a diamond phase was found in the product. S...

AI Technical Summary

Problems solved by technology

They all use nanosecond pulsed lasers, although their power density exceeds 109 W / cm2 , but they are limited to high temperature and high pressure, and only by collecting the laser and the liquid medium Nano-diamond particles are obtained from the splash product when the fixed graphite target acts, the synthesis efficiency is low, and it is mainly used for theoretical research

Feng Zhongchao and others applied for an invention patent named "A method of compound laser chemical vapor deposition of diamond film" (publication number: CN1221806A). The diamond film is deposited on the surface of the substrate by irradiation. The biggest advantage of this method is that it does not need to heat the substrate, the deposition temperature is low, and the film purity is high. However, the disadvantage is that the deposited diamond film is relatively thin. This will bring certain difficulties to the operation of the device. At the same time, the flow ratio of the hydrocarbon reaction gas and hydrogen gas that can absorb the laser wavelength into the vacuum reaction chamber should be strictly controlled, so the equipment for realizing this method is complex and costly. high

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