高质量石墨烯转移技术及在超快光学中的应用研究

发布时间：2018-03-25 10:23

本文选题：石墨烯　切入点：湿法转移　出处：《湖南大学》2015年硕士论文

【摘要】：石墨烯是理想的纳米二维材料,其具有优异的光学、电学、机械以及热学等性能,具有极其广泛的潜在应用价值。在众多的制备方法中,化学气相沉积(CVD)法由于其具有成本低廉、容易控制等优势,成为目前制备大面积、高质量石墨烯的重要方法。通常,CVD法制备的石墨烯生长在金属衬底上。然而,很多实际应用需要将生长在金属基底上的石墨烯无损地转移到目标衬底上,而转移的过程决定石墨烯的优劣并影响器件的最终性能。因此,石墨烯的应用与其转移技术密切相关。但是,目前的石墨烯转移技术还存在诸多问题,在转移的过程中会产生褶皱和破裂,在一定程度上限制了其进一步发展与应用。本论文以CVD法制备在铜衬底上的石墨烯为基础,对高质量石墨烯转移技术展开了研究,并讨论了其在超快光学方面的应用。论文主要工作如下： (1)研究了目标衬底表面性质对石墨烯转移质量的影响。通过实验发现对目标衬底进行超声处理能够显著地提高其表面的亲水性,而衬底表面亲水性的提高能够显著的抑制石墨烯转移过程中褶皱和裂纹的形成。更重要的是,发现超声处理技术能够适用于诸如蓝宝石、光纤头等多种衬底,这种简单、低成本、应用范围广泛的改进方法对石墨烯的转移质量有很大提高。此外,研究了退火对石墨烯转移质量的影响,实验发现退火能够有效的去除石墨烯表面的聚合物残留物。 (2)基于高质量的石墨烯可饱和吸收体实现了性能优化的掺Er锁模光纤激光输出。将石墨烯转移到经过处理的光纤头上,制备出了低光学损耗、性能稳定的石墨烯可饱和吸收器件。将石墨烯可饱和吸收体置入到光纤激光器中,获得了稳定的锁模输出。与常规转移方法制备的石墨烯饱和吸收体相比,优化转移的石墨烯可饱和吸收体可以使得锁模光纤激光器的输出脉冲宽度更窄,光光转换效率更高。
[Abstract]:Graphene is an ideal nano-two-dimensional material with excellent optical, electrical, mechanical and thermal properties, and has a wide range of potential applications. Because of its advantages of low cost and easy control, the chemical vapor deposition (CVD) method has become an important method for the preparation of large area and high quality graphene. Many practical applications require that graphene grown on metal substrates be transferred to the target substrate without loss, and that the transfer process determines the advantages and disadvantages of graphene and affects the ultimate performance of the device. The application of graphene is closely related to its transfer technology. However, there are still many problems in the current graphene transfer technology. To a certain extent, the further development and application of graphene are limited. In this paper, the high quality graphene transfer technology is studied based on the preparation of graphene on copper substrate by CVD method. Its application in ultrafast optics is also discussed. The main work of this thesis is as follows:. 1) the effect of the surface properties of the target substrate on the transfer quality of graphene was studied. It was found that ultrasonic treatment of the target substrate could significantly improve the hydrophilicity of the target substrate. The increase in hydrophilicity of substrate surface can significantly inhibit the formation of folds and cracks during graphene transfer. More importantly, it is found that ultrasonic treatment technology can be applied to a variety of substrates such as sapphire and fiber head. In addition, the effect of annealing on the transfer quality of graphene is studied. It is found that annealing can effectively remove the polymer residue on the surface of graphene. Based on the high quality graphene saturable absorber, the er doped mode-locked fiber laser output is realized. The graphene is transferred to the treated fiber head and the low optical loss is prepared. A stable graphene saturable absorber is obtained by placing the graphene saturable absorber into a fiber laser and obtaining a stable mode-locked output. Compared with the graphene saturated absorber prepared by conventional transfer method, The optimized transfer graphene saturable absorber can make the output pulse width of the mode-locked fiber laser narrower and the optical conversion efficiency higher.
【学位授予单位】：湖南大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TQ127.11

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