Atomically controlled substitutional boron-doping of graphene nanoribbons.
Atomically controlled substitutional boron-doping of graphene nanoribbons.
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DOI：
10.1038/ncomms9098
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发表时间：
2015-08-25
影响因子：
16.6
通讯作者：
Meyer E
中科院分区：
文献类型：
--
作者：
Kawai S;Saito S;Osumi S;Yamaguchi S;Foster AS;Spijker P;Meyer E
硼在缺电子和路易斯酸度方面是一种独特的元素。硼原子结合到芳香碳框架中提供了各种各样的功能。然而，有机硼化合物对水分和氧气的固有不稳定性阻碍了其发展。本文通过与有机硼前驱体的表面化学反应，制备了宽度分别为N=7、14和21的掺硼石墨烯纳米带（b - gnr）。硼掺杂剂的位置在B-GNR的中心，对应于4.8原子%，如程序所示。b - gnr的化学反应性是通过对一氧化氮（NO）的吸附来探测的，一氧化氮最有效地被硼位捕获，表现出刘易斯酸的特征。通过扫描隧道显微镜、带CO尖端的高分辨率原子力显微镜、密度泛函和经典计算，确定了no反应的B-GNR的结构性质和化学性质。硼原子结合到芳香碳框架中提供了各种各样的功能。在这里，作者通过表面化学反应制备了掺杂硼的石墨烯纳米带，并使用扫描探针显微镜在原子尺度上表征了其结构和性质。
Boron is a unique element in terms of electron deficiency and Lewis acidity. Incorporation of boron atoms into an aromatic carbon framework offers a wide variety of functionality. However, the intrinsic instability of organoboron compounds against moisture and oxygen has delayed the development. Here, we present boron-doped graphene nanoribbons (B-GNRs) of widths of N=7, 14 and 21 by on-surface chemical reactions with an employed organoboron precursor. The location of the boron dopant is well defined in the centre of the B-GNR, corresponding to 4.8 atom%, as programmed. The chemical reactivity of B-GNRs is probed by the adsorption of nitric oxide (NO), which is most effectively trapped by the boron sites, demonstrating the Lewis acid character. Structural properties and the chemical nature of the NO-reacted B-GNR are determined by a combination of scanning tunnelling microscopy, high-resolution atomic force microscopy with a CO tip, and density functional and classical computations. Incorporation of boron atoms into an aromatic carbon framework offers a wide variety of functionality. Here, the authors present boron-doped graphene nanoribbons by on-surface chemical reaction and characterize the structures and properties using scanning probe microscopy at the atomic-scale.