摘要
拉曼光谱技术是探测和分析石墨烯特性最有效的方法之一,其拉曼光谱信号主要包括D峰、G峰和2D峰。由于通常不受外界因素的影响,2D峰与G峰的强度比可以用来分析石墨烯的基本特性。以SiO_2/Si基底上的石墨烯为研究对象,基于多层膜系菲涅尔理论,研究了2D峰与G峰的强度比随石墨烯层数(厚度)变化的关系。研究结果表明2D峰与G峰的强度随着石墨烯层数增加而减小。进一步,研究了SiO_2厚度对拉曼光谱增强因子以及2D峰与G峰的强度比的影响,得到其最大增强因子和强度比分别为5.15、4.21和13.1。最后,讨论了2D峰与G峰的强度比与激发激光波长的关系,结果表明2D峰与G峰强度比随激发波长的增加先增加后减小,其最大比值为13.1,对应的激发波长为585nm。
Raman spectroscopy is one of the most prominent tools to detect and analyze the characteristics of gra- phene. And the main Raman Spectrum Signals are D, G and 2D band. The intensity ratio between the 2D and G Ra- man band is used to analyze the basic properties because of being free from extrinsic factors. The intensity ratio of 2D and G band as function number of graphene layer on Si substrate with a certain thickness of SiO2 are studied. The in- tensity ratio decreases with increasing of the layer approximately linearly. The results show that the interference effects caused by the multireflection of Raman light between the graphene layer. Further studies of the enhancement factor and the intensity ratio as function of the thickness of SiO2 are carried out. The enhancement factor of 5.15,4. 21and inten- sity ratio of 13.1 are achieved respectively. Finally, the intensity ratio varying excitation laser wavelength is discussed, and the intensity ratio rises nonlinearly as the wavelength, but drops beyond 585nm with the maximum ratio of 13.1.
作者
林成
LIN Cheng(School of Physics and Electronic Information Engineering, Neijiang Normal University,Neijiang Sichuan 641100 ,China)
出处
《激光杂志》
北大核心
2017年第4期41-44,共4页
Laser Journal
基金
四川省教育厅科研项目(16ZA0313)
内江师范学院专利科研项目(15ZL06)
关键词
石墨烯
拉曼光谱
增强因子
干涉增强
多次反射
graphene
raman spectrum
enhancement factor
interference enhanced effects
multireflection
