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| 低功率CO2激光辐照对多层石墨烯结构的影响 | |
| 引用本文： | 龙江游,黄婷,叶晓慧,林喆,钟敏霖,姜娟,李琳.低功率CO2激光辐照对多层石墨烯结构的影响[J].中国激光,2012,39(12):1206001-141. |
| 作者姓名： | 龙江游 黄婷 叶晓慧 林喆 钟敏霖 姜娟 李琳 |
| 作者单位： | 龙江游:清华大学机械工程系先进成型教育部重点实验室, 北京 100084 黄婷:清华大学机械工程系先进成型教育部重点实验室, 北京 100084 叶晓慧:清华大学机械工程系先进成型教育部重点实验室, 北京 100084 林喆:清华大学机械工程系先进成型教育部重点实验室, 北京 100084 钟敏霖:清华大学机械工程系先进成型教育部重点实验室, 北京 100084 姜娟:清华大学机械工程系先进成型教育部重点实验室, 北京 100084 李琳:曼彻斯特大学机械、航空航天与土木工程学院激光加工研究中心, 曼彻斯特M13, 9PL, 英国 |
| 基金项目： | 国家973计划(2011CB013000)资助课题。 |
| 摘 要： | 在真空环境下使用不同功率密度的CO2激光对化学气相沉积法(CVD)生长的石墨烯进行辐照,通过研究辐照前后的拉曼光谱变化考察了激光功率密度及辐照时间对多层石墨烯结构的影响。结果表明,当功率密度较低(13W/cm2)时,石墨烯拉曼光谱中的D峰降低,2D峰增强,石墨烯内的掺杂、缺陷减少。随着功率密度的增加,石墨烯的缺陷增多,部分缺陷连接形成晶界,使石墨烯分解为纳米晶。在58 W/cm2的功率密度下,当作用时间为120s时,在石墨烯表面产生非晶碳。研究表明,适当参数的CO2激光辐照能改善石墨烯的内在性能。 |
| 关 键 词： | 激光技术 石墨烯 拉曼光谱 CO2激光辐照 |
| 收稿时间： | 2012/7/9 |
Effects of Low Power CO2 Laser Irradiation on Structure of Multilayer Graphene |
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| Long Jiangyou,Huang Ting,Ye Xiaohui,Lin Zhe,Zhong Minling,Jiang Juan,Li Lin.Effects of Low Power CO2 Laser Irradiation on Structure of Multilayer Graphene[J].Chinese Journal of Lasers,2012,39(12):1206001-141. | |
| Authors: | Long Jiangyou Huang Ting Ye Xiaohui Lin Zhe Zhong Minling Jiang Juan Li Lin |
| Affiliation: | 1 Key Laboratory for Advanced Materials Processing Technology,Department of Mechanical Engineering,Tsinghua University,Beijing 100084,China 2 Laser Processing Research Centre,School of Mechanical,Aerospace and Civil Engineering,University of Manchester,Manchester,M13,9PL,UK |
| Abstract: | Multilayer graphene generated by chemical vapor deposition (CVD) method is irradiated by CO2 laser in vacuum with different power densities and irradiation time. Raman spectroscopy is used to clarify the influences of laser power density and irradiation time on the structure modification. At a laser power density of 13 W/cm2, the decrease of D-band and the increase of G-band intensity are due to the reduction of defects. In contrast, the sample irradiated with higher power density shows that the D-band intensity increase dramatically caused by the laser thermal effects. Nanocrystalline graphene is formed as the defects after irradiation at higher power desities. With increasing irradiation time to 120 s, amorphous carbon is formed at the surface of graphene at a lase power density of 58 W/cm2. These results show that proper irradiation of CO2 laser can improve the charactervstics of graphene. |
| Keywords: | laser techology graphene Raman spectroscopy CO2 laser irradiation |
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