Carbon nanotube-dependent synthesis of armchair graphene nanoribbons
Carbon nanotube-dependent synthesis of armchair graphene nanoribbons
复制标题
扶手椅石墨烯纳米带的碳纳米管依赖性合成
DOI：
10.1007/s12274-021-3819-8
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发表时间：
2021-09-16
期刊：
影响因子：
9.9
通讯作者：
Shi, Lei
中科院分区：
文献类型：
--
作者：
Zhang, Yifan;Cao, Kecheng;Shi, Lei
具有中等带隙的亚纳米扶手椅型石墨烯纳米带（GNRs）在新型纳米器件方面具有巨大的潜力。在单壁碳纳米管（SWCNTs）的受限管状空间中可以合成GNRs，其中前驱体分子经过专门设计，可以形成具有一定宽度和边缘的GNRs。然而，单壁碳纳米管的直径和金属含量如何影响GNR的合成仍然是未探索的。在此，我们应用一系列具有不同平均直径的单壁碳纳米管来研究GNRs的直径依赖性合成。通过使用拉曼光谱和透射电子显微镜，我们发现GNR的宽度可以根据单壁碳纳米管的直径进行调整。特别是平均直径为1.3 nm的单壁碳纳米管制备的6和7扶手椅型GNR产率最高，这可以通过考虑GNR的宽度和氢原子和碳原子的货车范德华半径来很好地解释。此外，半导体和金属单壁碳纳米管产生具有不同产率的GNR，这可能归因于不同的直径分布和缺陷密度。这些结果使得大规模高产率生产某些扶手椅型石墨烯纳米带成为可能，这将有利于未来作为亚纳米宽度半导体的应用。
Sub-nanometer armchair graphene nanoribbons (GNRs) with moderate band gap have great potential towards novel nanodevices. GNRs can be synthesized in the confined tubular space of single-walled carbon nanotubes (SWCNTs), in which precursor molecules have been specifically designed to form the GNRs with certain width and edge. However, it is still unexplored how the diameter and metallicity of SWCNTs influence the synthesis of the GNRs. Herein, we applied a series of SWCNTs with different average diameters to study the diameter-dependent synthesis of GNRs. By using Raman spectroscopy and transmission electron microscopy, we found that the width of the GNRs can be tailored by the diameter of the SWCNTs. Especially, the SWCNTs with average diameter of 1.3 nm produced 6 and 7 armchair GNRs with the highest yield, which can be well explained by considering the width of the GNRs and van der Waals radius of hydrogen and carbon atoms. In addition, semiconducting and metallic SWCNTs produced GNRs with different yields, which could attribute to different diameter distributions and density of defects. These results enable the possibility of a high-yield production of certain armchair graphene nanoribbons in large scale, which would benefit future applications as semiconductor with sub-nanometer in width.