Graphene-like nanoribbons periodically embedded with four- and eight-membered rings.
Graphene-like nanoribbons periodically embedded with four- and eight-membered rings.
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周期性嵌入四元环和八元环的类石墨烯纳米带
DOI：
10.1038/ncomms14924
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发表时间：
2017-03-31
影响因子：
16.6
通讯作者：
Zhong D
中科院分区：
文献类型：
--
作者：
Liu M;Liu M;She L;Zha Z;Pan J;Li S;Li T;He Y;Cai Z;Wang J;Zheng Y;Qiu X;Zhong D
将非六方环嵌入到sp2杂化碳网络中被认为是丰富低维石墨烯结构家族的一种有前途的策略。然而，与六边形对应物相比，非六边形环在能量上是不稳定的，使得以可控的方式将非六边形环嵌入碳基纳米结构中具有挑战性。在这里，我们报告了周期性嵌入的四元环和八元环的石墨烯纳米带的表面合成。扫描隧道显微镜和原子力显微镜的研究表明，四元环和八元环之间形成相邻的平面构型的？主链。非六方环作为一种拓扑修饰，显著改变了纳米带的电子性质。最高的占据和最低的未占据带态分别主要分布在八元环和四元环周围。包含非六方环的石墨烯类纳米带的实现展示了在纳米带中制造非六方环的可控路线，并且使得有可能揭示由非六方环诱导的它们的独特性质。
Embedding non-hexagonal rings into sp2-hybridized carbon networks is considered a promising strategy to enrich the family of low-dimensional graphenic structures. However, non-hexagonal rings are energetically unstable compared to the hexagonal counterparts, making it challenging to embed non-hexagonal rings into carbon-based nanostructures in a controllable manner. Here, we report an on-surface synthesis of graphene-like nanoribbons with periodically embedded four- and eight-membered rings. The scanning tunnelling microscopy and atomic force microscopy study revealed that four- and eight-membered rings are formed between adjacent perylene backbones with a planar configuration. The non-hexagonal rings as a topological modification markedly change the electronic properties of the nanoribbons. The highest occupied and lowest unoccupied ribbon states are mainly distributed around the eight- and four-membered rings, respectively. The realization of graphene-like nanoribbons comprising non-hexagonal rings demonstrates a controllable route to fabricate non-hexagonal rings in nanoribbons and makes it possible to unveil their unique properties induced by non-hexagonal rings.