您的位置:首页  > 论文页面

不同能流的飞秒激光脉冲烧蚀高定向热解石墨的表面结构研究

发表时间:2013-08-15  浏览量:1299  下载量:591
全部作者: 张楠,冯培培
作者单位: 南开大学现代光学研究所,光学信息技术科学教育部重点实验室
摘 要: 使用1.1~178.0 J/cm2不同激光能流的50 fs脉冲激光在空气中烧蚀高定向热解石墨(highly oriented pyrolytic graphitej,HOPG),在其表面制备出多种微纳碳结构,包括枝杈状碳结构和尺寸小至100 nm的颗粒。这些碳纳米颗粒在白光照射下可以形成彩虹状或平行的彩色图样。通过对烧蚀过的石墨表面进行显微拉曼光谱测量发现,石墨表面产生的这些微纳结构均保持了石墨的sp2键,但除了枝杈结构外,其余微纳结构的石墨层间结构均被破坏。由此可以推断,枝杈状结构的形成主要源于光机械机制,而其余微纳结构均在激光烧蚀中经历了热转变过程。
关 键 词: 光学;微纳碳结构;飞秒激光烧蚀;高定向热解石墨
Title: Investigation on the surface structure of highly oriented pyrolytic graphite ablated by femtosecond laser pulses with different laser fluence
Author: ZHANG Nan, FENG Peipei
Organization: Key Laboratory of Optical Information Science and Technology of Ministry of Education, Institute of Modern Optics, Nankai University
Abstract: In this paper, 50 fs laser pulses with different laser fluences ranging from 1.1 to 178.0 J/cm2 are used to ablate highly oriented pyrolytic graphite (HOPG). Multiple kinds of carbon micro-/nano-structures are obtained at the ablated target surface, including branch-like graphite structure and carbon nano-particles with sizes down to 100 nm. These carbon nano-materials can form rainbow-like or parallel colorful pattern when irradiated by a white light source. In addition, it is found that the generated micro-structures on the ablated graphite surface still retain the sp2 bond by using the micro-Raman spectroscopy, but except for the branch-like structures do not have the graphite’s layer structures. Therefore it can be deduced that the brach-like structure is formed mainly by the optomechanical mechanism and other structures all undergo the thermal transition process during the ablation.
Key words: optics; carbon micro-/nano-structure; femtosecond laser ablation; highly oriented pyrolytic graphite
发表期数: 2013年8月第15期
引用格式: 张楠,冯培培. 不同能流的飞秒激光脉冲烧蚀高定向热解石墨的表面结构研究[J]. 中国科技论文在线精品论文,2013,6(15):1388-1392.
 
1 评论数 0
暂无评论
友情链接