基于拉曼光谱的石墨烯研究
发布时间：2018-08-27 09:10
【摘要】：石墨烯特有的能带结构决定了其在电学、光学、自旋电子学等方面具有很好的应用前景,但是由于石墨烯对外界条件非常敏感,例如气体分子的吸附、金属纳米粒子的沉积、基底效应、电子束辐照等,都可以严重影响石墨烯的性质。论文围绕此问题开展了研究,主要包括以下内容:(1)金纳米粒子沉积对石墨烯影响研究。使用拉曼光谱表征金纳米粒子沉积对石墨烯的影响,发现金纳米粒子沉积导致石墨烯拉曼光谱整体发生红移,并且2D峰的移动明显大于G峰,并提出局部应力模型解释了这一现象。(2)电子束辐照对不同层数石墨烯影响研究。石墨烯的表征与器件的制备需要使用电子束辐照石墨烯,这将导致石墨烯产生缺陷。使用拉曼光谱研究了电子束辐照对不同层数石墨烯的影响。发现电子束辐照对双层的影响明显小于单层,即在电子束辐照条件下,双层石墨烯SP2的碳-碳比单层石墨烯的稳定。并提出增加石墨烯第三维方向的相互作用可以使准二维的石墨烯更稳定模型来解释双层石墨烯的稳定性。并且通过两个实验进一步证明此模型的正确性。
[Abstract]:Because of its unique band structure, graphene has a good application prospect in electricity, optics, spin electronics and so on. However, graphene is very sensitive to external conditions, such as adsorption of gas molecules, deposition of metal nanoparticles, and so on. Substrate effect, electron beam irradiation and so on, can seriously affect the properties of graphene. The main contents are as follows: (1) the effect of gold nanoparticles deposition on graphene. The effect of gold nanoparticles deposition on graphene was characterized by Raman spectroscopy. The red shift of Raman spectra of graphene was caused by the deposition of gold nanoparticles, and the shift of 2D peak was obviously larger than that of G peak. A local stress model is proposed to explain this phenomenon. (2) the effect of electron beam irradiation on graphene in different layers is studied. The characterization of graphene and the preparation of devices require electron beam irradiation, which will lead to defects in graphene. The effects of electron beam irradiation on different layers of graphene were studied by Raman spectroscopy. It is found that the effect of electron beam irradiation on the double layer is obviously less than that on the single layer, that is, under the condition of electron beam irradiation, the carbon-carbon stability of the bilayer graphene SP2 is more stable than that of the monolayer graphene. It is suggested that the stability of bilayer graphene can be explained by adding the interaction in the third direction of graphene to make the quasi-two-dimensional graphene more stable. The correctness of the model is further proved by two experiments.
【学位授予单位】：国防科学技术大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TQ127.11
本文编号：2206787
[Abstract]:Because of its unique band structure, graphene has a good application prospect in electricity, optics, spin electronics and so on. However, graphene is very sensitive to external conditions, such as adsorption of gas molecules, deposition of metal nanoparticles, and so on. Substrate effect, electron beam irradiation and so on, can seriously affect the properties of graphene. The main contents are as follows: (1) the effect of gold nanoparticles deposition on graphene. The effect of gold nanoparticles deposition on graphene was characterized by Raman spectroscopy. The red shift of Raman spectra of graphene was caused by the deposition of gold nanoparticles, and the shift of 2D peak was obviously larger than that of G peak. A local stress model is proposed to explain this phenomenon. (2) the effect of electron beam irradiation on graphene in different layers is studied. The characterization of graphene and the preparation of devices require electron beam irradiation, which will lead to defects in graphene. The effects of electron beam irradiation on different layers of graphene were studied by Raman spectroscopy. It is found that the effect of electron beam irradiation on the double layer is obviously less than that on the single layer, that is, under the condition of electron beam irradiation, the carbon-carbon stability of the bilayer graphene SP2 is more stable than that of the monolayer graphene. It is suggested that the stability of bilayer graphene can be explained by adding the interaction in the third direction of graphene to make the quasi-two-dimensional graphene more stable. The correctness of the model is further proved by two experiments.
【学位授予单位】：国防科学技术大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TQ127.11
【参考文献】
相关期刊论文 前1条
1 厉巧巧;韩文鹏;赵伟杰;鲁妍;张昕;谭平恒;冯志红;李佳;;缺陷单层和双层石墨烯的拉曼光谱及其激发光能量色散关系[J];物理学报;2013年13期
，本文编号：2206787
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