Xing Shuya, Liu Bing, Wang Wenquan, Guo Jiandong, Wang Weihua
Beijing National Laboratory for Condensed Matter Physics and Institute of Physics, Chinese Academy of Sciences, Beijing, 100190, China.
College of Physics, Jilin University, Changchun, 130012, China.
Chem Asian J. 2018 Jun 15. doi: 10.1002/asia.201800610.
Nanometer-wide graphene nanoribbons can be synthesized from halogen aromatics through multistep on-surface reactions, but the catalytic role of extrinsic transition-metal atoms in these reactions are still to be explored. Here by low-temperature scanning tunneling microscopy, we investigated the on-surface synthesis of graphene nanoribbons from 10,10'-dibromo-9,9'-bianthryl precursors in the presence of Ni atoms. Ni atoms not only act as catalysts in debromination and lead to the formation of an organometallic intermediate at 300 K, but also prompt the fusion reaction between graphene nanoribbons at 673 K. Our work demonstrates a more efficient way to fabricate fused graphene nanoribbons.
纳米级的石墨烯纳米带可以通过多步表面反应从卤代芳烃中合成，但外在过渡金属原子在这些反应中的催化作用仍有待探索。在这里，我们通过低温扫描隧道显微镜研究了在镍原子存在下，由10,10'-二溴-9,9'-联蒽前体进行的石墨烯纳米带表面合成。镍原子不仅在脱溴反应中充当催化剂，并在300 K时导致形成有机金属中间体，而且在673 K时促使石墨烯纳米带之间发生融合反应。我们的工作展示了一种更有效的制备融合石墨烯纳米带的方法。
