Phase Transformations of Graphite and Carbon Black by Laser with Low Power Density  

作　　者：孙景 翟琪 雷贻文 杨星 杜希文 

机构地区：[1]School of Material Science and Engineering,Tianjin University

出　　处：《Transactions of Tianjin University》2007年第5期318-321,共4页天津大学学报（英文版）

基　　金：Supported by National Natural Science Foundation of China(No.50372043);Tianjin Science and Technology Committee(No.06YFJZJC01200).

摘　　要：The structure phase transformations of graphite and carbon black induced by pulsed laser were studied in this paper.Under irradiation with laser beam of 1.06 μm wavelength and power density of 106 W·cm-2,both graphite structure and carbon black structure were changed obviously.The results of Raman analyses and Transmission Electron Microscopy(TEM)observations show that graphite transforms into nanodiamond about 5 nm and carbon black is graphitized.It is demonstrated that graphite is the intermediate phase in the transformation from carbon black to diamond,and graphite is easier to transform into diamond by laser irradiation than carbon black.The structure phase transformations of graphite and carbon black induced by pulsed laser were studied in this paper. Under irradiation with laser beam of 1.06 μm wavelength and power density of 106 W·cm^-2 both graphite structure and carbon black structure were changed obviously. The results of Raman analyses and Transmission Electron Microscopy （TEM） observations show that graphite transforms into nanodiamond about 5 nm and carbon black is graphitized. It is demonstrated that graphite is the intermediate phase in the transformation from carbon black to diamond, and graphite is easier to transform into diamond by laser irradiation than carbon black.

关 键 词：pulsed laser GRAPHITE carbon black DIAMOND 

分 类 号：TN241[电子电信—物理电子学]