摘要
化学气相沉积法制备的石墨烯为多晶,其晶界缺陷对石墨烯的电学、热学等各性能有显著影响.快速、有效地观察石墨烯的晶界分布对石墨烯的应用研究有重要意义.对石墨烯进行热处理以增强石墨烯的缺陷,发现热处理后石墨烯边界和晶界处的拉曼缺陷峰有明显增强,而晶畴内石墨烯的缺陷峰基本没有变化.为此,应用热处理法并结合拉曼光谱及其面扫描技术,可直观地表征出满层石墨烯的晶界分布并测定单晶尺寸.该方法不限制石墨烯样品的衬底,可以快速有效地鉴别出石墨烯晶界分布,为石墨烯晶粒尺寸的判断提供了一种简单有效的方法.
The graphene films prepared by chemical vapor deposition are typically polycrystalline,and the grain boundaries are expected to degrade the electrical and thermal properties of the resulting films. The study of graphene grains and their boundary is therefore critical for enabling diverse applications. In this work,thermal treatment has been applied to introduce defects on the transferred graphene films. It is found that the intensity of Raman D peak at the edge of graphene and the grain boundary are significantly enhanced after heat treatment in air,whereas no change was found in D peak within the graphene grain. Therefore,the grain boundary distribution of the graphene films can be characterized by thermal treatment combined with Raman spectroscopy-scanning technique,which provides a rapid and effective method to identify the graphene grains on arbitrary substrates.
出处
《曲靖师范学院学报》
2017年第6期18-23,共6页
Journal of Qujing Normal University
基金
福建省自然科学基金科技项目"大面积石墨烯/六方氮化硼异质薄膜的制备及器件研究"(2015J06016)
