荷能重离子辐照引起石墨烯电学性质变化研究

项目名称： 荷能重离子辐照引起石墨烯电学性质变化研究

项目编号： No.11505243

项目类型： 青年科学基金项目

立项/批准年度： 2016

项目学科： 数理科学和化学

项目作者： 曾健

作者单位： 中国科学院近代物理研究所

项目金额： 25万元

中文摘要： 石墨烯是目前世上最薄的纳米材料，具有诸多优良性能。如半整数量子霍尔效应、奇异量子遂穿效应、铁磁性、超导性和巨磁阻效应等。石墨烯的电阻率极低，电子迁移的速度极快，因此被期待可用来发展出更薄、导电速度更快的新一代电子元件或晶体管。石墨烯特殊的单原子层结构也为石墨烯的应用引入了不稳定的因素。现有研究表明荷能重离子辐照将在石墨烯中引入缺陷，并且，在相同的辐照条件下，沉积在SiO2/Si衬底上的单层石墨烯比薄层石墨更容易产生辐照损伤。在实际应用中，不同的离子辐照环境可能在石墨烯中引入缺陷，这对石墨烯器件的应用会产生极大的限制，甚至导致石墨烯器件不能正常运行。因此，辐照引入的缺陷对石墨烯电学性质的影响是石墨烯应用必须解决的问题。本工作将采用快重离子及高电荷态离子辐照不同长宽比的石墨烯纳米带，对比不同离子种类、离子能量、电荷态以及不同辐照注量条件下石墨烯的电学性质改变，为石墨烯器件应用环境提供参考。

中文关键词： 石墨烯；电学性质；快重离子；高电荷态离子；辐照效应

英文摘要： Graphene is currently the thinnest materials in the world, which has many excellent properties, such as half integer quantum hall effect, anomalous quantum tunneling effect, ferromagnetism, superconductivity and giant magneto resistance effect, etc. The pretty low resistivity and high electron speed of graphene makes it the probable material for developing a new generation of electronic components or transistors, which is thinner and has better conductivity. The special single atomic layer structure of graphene also introduces instability factors for the application of graphene devices. The research results show that the energetic ion irradiation will introduced defects into graphene. Under the same irradiation condition, monolayer graphene deposited on SiO2 /Si substrate is easier to damage than thin layer graphite films. In practice, different irradiation environment introduce structure defects into graphene, which will produce a great deal of restrictions to the application of graphene devices. Much more seriously, the graphene devices even cannot run normally in those practical application environment. Thus the influence of these defects to the graphene electronic properties is an important research topic which need to be figure out clearly. In this work, swift heavy ions and highly charged ions will be used to irradiate graphene nanoribbons. The electrical properties of graphene under various irradiation conditions, such as different ion beams, ion energies, ion charges and fluences would be investigated. Through the comparative study, we could figure out the influence of different irradiation parameters to graphene electrical properties. The experimental data offers a necessary reference for the applications of graphene devices.

英文关键词： graphene;electronic properties;swift heavy ions;highly charged ions;irradiation effects