A kind of method and device for improving the synthesis efficiency of nano-diamond

Abstract

The invention relates to a method and device for improving the synthesis efficiency of nano-diamond. The device comprises a laser generation system, a workpiece system and an auxiliary system. The spot diameter of a laser emitted by a high-powder pulse laser device is enlarged by a beam expanding mirror, two laser beams are generated after the laser is reflected and split by a beam splitter, the first laser beam passes through a focusing lens to irradiate a circularly flowing graphite water column through a light entrance, the second laser beam irradiates the graphite water column through another light entrance, graphite particles in a solution absorb laser energy and then quickly form high-temperature high-pressure plasmas, and the nanoscale diamond is generated in the extremely-short and nonequilibrium process. According to the method and device, the problems that in the nano-diamond synthesis process, the laser acting area is small, and the synthesis efficiency is low are solved, continuous synthesis at normal temperature under normal pressure is achieved, and the nano-diamond particles with good dispersity and uniform size distribution are obtained.

Description

technical field [0001] The invention belongs to the field of artificially synthesized nano-diamonds, in particular to a method and a device for improving synthesis efficiency of nano-diamonds under normal temperature and pressure. Background technique [0002] The preparation science of nanomaterials is an important field in nanotechnology, and has made great progress in recent years. Among the many nanomaterial preparation methods, laser, as a very characteristic advanced technology, has received more and more attention. Nanodiamond has excellent mechanical, thermal, electrical, optical and chemical properties. The combination of many excellent properties makes it irreplaceable in many cutting-edge fields and has broad application prospects. [0003] In recent years, Chen Xiaohu and Wang Jinbin have obtained nano-diamonds by using nanosecond pulsed lasers to shock solid graphite targets. Wang Jinbin synthesized nano-diamonds by collecting sputtering liquid by using nanosec...

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Problems solved by technology

[0005] Although the use of laser to synthesize diamond reduces the conversion conditions, there has been no special preparation equipment, and the operation is still very complicated, and the effect is not obvious, and the conversion efficiency is still very low, which is not conducive to putting into production.

Moreover, when the laser is used to prepare nano-diamonds, the laser directly interacts with the graphite target. Due to the high energy of the laser, the graphite target will splash, contaminate the preparation platform, and even cause certain damage to the laser head, which affects the preparation accuracy and the laser head. service life

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