摘要
通过将纳米管解压缩可以很容易地生产石墨烯纳米带,因为碳纳米管结构可以被认为是卷起的石墨烯筒。这是一种特殊的2D石墨结构,具有出色的性能。应用领域广泛,包括晶体管、光学和微波通信设备、生物传感器、化学传感器、电子存储和处理设备以及纳米机电系统和复合材料。通过扫描电子显微镜(SEM)观察薄膜的形貌,通过拉曼光谱法表征石墨烯的性质,并通过半导体参数测量系统测量薄膜的电导率。拉曼光谱表明,通过优化工艺可以增强石墨烯的拉曼特性。碳纳米管制备石墨烯带的两个重要参数是激光能量密度和辐照时间。在这项研究中,通过准分子激光辐照碳纳米管薄膜来生产石墨烯纳米带。实验结果表明,在150 mJ的激光能量下,观察到连接时碳纳米管没有打开。在450 mJ的能量下,可以有效地破坏碳纳米管,并且使其部分地形成石墨烯带。此时,膜的电导率达到最大值。由于蓄热作用,在碳纳米管壁上出现大量的多孔结构。
GNRs can be readily produced by unzipping the nanotubes because CNT structure can be analogically considered as graphene sheets rolled up.This is a special 2D graphitic structure performing the exceptional properties.Due to the unique structure and the outstanding properties,GNRs have been used in a vast range of applications,including transistors,optical and microwave communication devices,biosensors,chemical sensors,electronic memory and processing devices,nano electromechanical systems,and composites.The morphology of the fiilms was observed by scanning electron microscopy(SEM),and the properties of graphene were characterized by Raman spectroscopy.The conductivity of the fiilms was measured by a semiconductor parameter measurement system.Raman spectroscopy showed that the Raman characteristics of graphene characterized by optimized process were enhanced.Laser energy and irradiation time were two important parameters for the preparation of graphene from carbon nanotubes.In this study,to open carbon nanotubes by laser,graphene nanoribbons were produced by excimer laser irradiation of carbon nanotubes thin films.The experimental results show that,with the laser energy 150 mJ,the carbon nanotubes are not opened while the connection is observed.With the energy 450 mJ,the carbon nanotubes can be effectively destroyed,and graphene strips can be partially opened to form.At this time,the conductivity of the fiilm reaches the maximum value.Due to the thermal accumulation effect,a large number of porous structures appear on the wall of carbon nanotubes.
作者
刘志
陈继民
李东方
张成宇
Liu Zhi;Chen Jimin;Li Dongfang;Zhang Chenyu(Institute of Laser Engineering,Beijing University of Technology,Beijing 100124,China;Beijing Engineering Research Center of 3D Printing for Digital Medical Health,Beijing University of Technology,Beijing 100124,China)
出处
《红外与激光工程》
EI
CSCD
北大核心
2020年第9期218-222,共5页
Infrared and Laser Engineering
关键词
碳纳米管
石墨烯
准分子激光
拉曼光谱
carbon nanotubes
graphene
excimer laser
Raman spectroscopy
