Well-defined sub-nanometer graphene ribbons synthesized inside carbon nanotubes
Well-defined sub-nanometer graphene ribbons synthesized inside carbon nanotubes
复制标题
在碳纳米管内合成的明确的亚纳米石墨烯带
DOI：
10.1016/j.carbon.2020.08.065
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发表时间：
2021-01-01
期刊：
影响因子：
10.9
通讯作者：
Pichler, Thomas
中科院分区：
文献类型：
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作者：
Kuzmany, Hans;Shi, Lei;Pichler, Thomas
具有亚纳米宽度的石墨烯纳米带对纳米电子和设备非常感兴趣，因为它们将石墨烯的不同寻常的输运性质与由于横向量子限制而打开的带隙结合在一起。目前，人们正在为培育这种纳米带付出巨大的研究努力。在这里，我们通过在单壁碳纳米管中对二茂铁分子进行高温真空退火，合成了宽度分别为0.61和0.74 nm、激子能隙分别为1.83和2.18 eV的6-和7-扶手椅石墨烯纳米带。原子分辨电子显微镜证明了所获得的石墨烯纳米带的生长，而结合广泛的波长相关的拉曼散射表征和量子化学计算对其明确的结构进行了鉴定。这些发现使一种简单和可扩展的方法成为可能，从而控制生长和详细分析定义良好的亚纳米石墨烯纳米带。(C)2020爱思唯尔有限公司。保留所有权利。
Graphene nanoribbons with sub-nanometer widths are extremely interesting for nanoscale electronics and devices as they combine the unusual transport properties of graphene with the opening of a band gap due to quantum confinement in the lateral dimension. Strong research efforts are presently paid to grow such nanoribbons. Here we show the synthesis of 6- and 7-armchair graphene nanoribbons, with widths of 0.61 and 0.74 nm, and excitonic gaps of 1.83 and 2.18 eV, by high-temperature vacuum annealing of ferrocene molecules inside single-walled carbon nanotubes. The growth of the so-obtained graphene nanoribbons is evidenced from atomic resolution electron microscopy, while their well-defined structure is identified by a combination of an extensive wavelength-dependent Raman scattering characterization and quantum-chemical calculations. These findings enable a facile and scalable approach leading to the controlled growth and detailed analysis of well-defined sub-nanometer graphene nanoribbons. (C) 2020 Elsevier Ltd. All rights reserved.