Phase growth mechanism of ultra-fine nano-diamond prepared by nanosecond laser

ZHENG Lamei; LV Yuwen; TANG Shaoxiong; DAI Wenjie; SUI Sai; REN Xudong

doi:10.7510/jgjs.issn.1001-3806.2016.01.006

In order to study the growth mechanism from graphite to nano-diamond by laser processing, micron graphite suspension was irradiated by nanosecond pulse laser and then was purified by acid high-temperature oxidation. X-ray diffraction, Raman spectroscopy and high-resolution transmission electron microscopy were used in theoretical analysis and experimental verification. The formation mechanism of nano-diamond was analyzed from thermodynamics and kinetics aspects respectively. Ultra-fine nano-diamond with particle size of 4nm~12nm and uniformly dispersion was synthesized. The results show that under the irradiation of nanosecond pulse laser, the transition from graphite to diamond is solid-vapor-liquid-solid phase transformation process. Compared with millisecond pulse laser, nanosecond laser with high intensity and short pulse width can supply larger super-cooling degree for diamond core growth and improve nucleation rate and growth velocity of nano-diamond. However, growth temperature range of nano-diamond is extremely small. Inevitable graphitization on the surface of diamond particles limits the further growth of nano-diamond.

Phase growth mechanism of ultra-fine nano-diamond prepared by nanosecond laser

Corresponding author: REN Xudong, renxd@mail.ujs.edu.cn

1. School of Mechanical Engineering, Jiangsu University, Zhengjiang 212013, China

Received Date: 2014-12-10

Accepted Date: 2015-01-04

Available Online: 2016-01-25

Abstract: In order to study the growth mechanism from graphite to nano-diamond by laser processing, micron graphite suspension was irradiated by nanosecond pulse laser and then was purified by acid high-temperature oxidation. X-ray diffraction, Raman spectroscopy and high-resolution transmission electron microscopy were used in theoretical analysis and experimental verification. The formation mechanism of nano-diamond was analyzed from thermodynamics and kinetics aspects respectively. Ultra-fine nano-diamond with particle size of 4nm~12nm and uniformly dispersion was synthesized. The results show that under the irradiation of nanosecond pulse laser, the transition from graphite to diamond is solid-vapor-liquid-solid phase transformation process. Compared with millisecond pulse laser, nanosecond laser with high intensity and short pulse width can supply larger super-cooling degree for diamond core growth and improve nucleation rate and growth velocity of nano-diamond. However, growth temperature range of nano-diamond is extremely small. Inevitable graphitization on the surface of diamond particles limits the further growth of nano-diamond.

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Reference (17)

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Phase growth mechanism of ultra-fine nano-diamond prepared by nanosecond laser

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