【作者】 陈欣；

【导师】 曲良体；

【作者基本信息】 北京理工大学 ， 化学， 2016， 硕士

【摘要】 石墨烯,一种只有一个碳原子层厚度的二维晶体,具有独特的结构、机械和电子特性。碳纳米由石墨烯单层绕同轴缠绕而成。这类碳材料都具有独特的性质。激光是一种简单有效的加热改性工具,经过激光处理后的碳材料在亲水性方面发生了变化。本论文讨论激光处理碳纳米管的亲水性,以及激光在清洁石墨烯中的应用。碳纳米管本身是疏水的性质,本实验中从超顺排纳米管阵列中抽出超顺排碳纳米膜,将超顺排碳纳米管薄膜铺在铝框上。用Nd:YAG激光系统扫描碳纳米管薄膜。测试其亲疏水性的变化。通过改变激光的扫描功率和扫描速率参数,可以实现对碳纳米管亲疏水性的调控。用这种方法制得了超亲水碳纳米管薄膜以及超疏水碳纳米管薄膜。为改善碳纳米管薄膜的亲水性并能够在生物医学中应用提供了一种方法。激光技术对微米及亚微米级颗粒具有清洁作用。干净的石墨烯表面对于石墨烯的性质,尤其是在器件中的性质表现很重要。本文采用机械剥离法制备石墨烯,将其转移到SiO2/Si基底上,并用Nd:YAG激光系统直接照射石墨烯。一定时间后石墨烯表面的污染物颗粒明显减少。同时用拉曼对石墨烯进行表征,结果表明,石墨烯在激光照射的过程中拉曼光谱中并没有引入缺陷峰。本文发展了一种激光清洁石墨烯的技术,这种方法简单有效,同时是一种非接触式的清洁技术。为石墨烯器件的清洁提供了一种新方法。更多还原

【Abstract】 Graphene, a two-dimensional crystal with only one carbon atomic layer’s thickness,has unique structure, mechanical and electronic properties. Carbon nanotube is wounded by a single layer graphene. These two kinds of materials have unique properties. Laser is a simple and effective heating method, which can change the properties about hydrophilicity of carbon nanotubes. In this work, we discuss the change of hydrophilicity on carbon nanotubes after laser treating, and the application in laser cleaning of graphene.Carbon nanotube is hydrophobic in nature. In this experiment, we extract super hydrophilic carbon nanotube films from the ultra-aligned carbon nanotube(SCNT) arrays.We use Nd:YAG laser system to scan SCNT films. And then test the changes of their hydrophobicity. By changing the laser scanning power and scanning rate parameters, the hydrophobicity of SCNT films can be regulated and controlled. In this way, the super hydrophilic SCNT films and the super hydrophobic SCNT films were prepared, which was helpful for the application of SCNT in biomedicine.Laser technology can clean micron and submicron particles. Clean surfaces are important to the electronic properties of devices based on graphene. In this paper, an Nd:YAG laser was used to directly irradiate mechanically exfoliated graphene flakes with SiO2/Si substrates. Results showed that several minutes of irradiation was able to remove impurity particles from the surface, and there is no defect peak of graphene induced in Raman spectra after laser cleaning. In this paper, a technique of laser cleaning graphene is developed. This method is simple and effective which is also a non-contact cleaning technology. A new method is provided for the cleaning of graphene devices.更多还原