Abstract 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.

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在碳纳米管内合成的明确定义的亚纳米石墨烯带

摘要 具有亚纳米宽度的石墨烯纳米带对于纳米级电子器件和器件非常有趣，因为它们结合了石墨烯不寻常的传输特性和由于横向尺寸的量子限制而导致的带隙开口。目前为生长这种纳米带付出了巨大的研究努力。在这里，我们展示了通过对单壁碳纳米管内的二茂铁分子进行高温真空退火，合成宽度为 0.61 和 0.74 nm，激子间隙为 1.83 和 2.18 eV 的 6 和 7 扶手椅石墨烯纳米带。原子分辨率电子显微镜证明了如此获得的石墨烯纳米带的生长，而它们明确定义的结构是通过广泛的波长相关拉曼散射表征和量子化学计算的组合来确定的。