Jacobse Peter H, Simonov Konstantin A, Mangnus Mark J J, Svirskiy Gleb I, Generalov Alexander V, Vinogradov Alexander S, Sandell Anders, Mårtensson Nils, Preobrajenski Alexei B, Swart Ingmar
Debye Institute for Nanomaterials Science, Utrecht University, PO Box 80000, 3508 TA Utrecht, The Netherlands.
Department of Physics and Astronomy, Uppsala University, Box 516, 75120 Uppsala, Sweden.
J Phys Chem C Nanomater Interfaces. 2019 Apr 11;123(14):8892-8901. doi: 10.1021/acs.jpcc.8b12209. Epub 2019 Mar 25.
On-surface synthesis has emerged in the last decade as a method to create graphene nanoribbons (GNRs) with atomic precision. The underlying premise of this bottom-up strategy is that precursor molecules undergo a well-defined sequence of inter- and intramolecular reactions, leading to the formation of a single product. As such, the structure of the GNR is encoded in the precursors. However, recent examples have shown that not only the molecule, but also the coinage metal surface on which the reaction takes place, plays a decisive role in dictating the nanoribbon structure. In this work, we use scanning probe microscopy and X-ray photoelectron spectroscopy to investigate the behavior of 10,10'-dichloro-9,9'-bianthryl (DCBA) on Ag(111). Our study shows that Ag(111) can induce the formation of both seven-atom wide armchair GNRs (7-acGNRs) and 3,1-chiral GNRs (3,1-cGNRs), demonstrating that a single molecule on a single surface can react to different nanoribbon products. We additionally show that coadsorbed dibromoperylene can promote surface-assisted dehydrogenative coupling in DCBA, leading to the exclusive formation of 3,1-cGNRs.
在过去十年中，表面合成已成为一种以原子精度制备石墨烯纳米带（GNRs）的方法。这种自下而上策略的基本前提是前体分子经历明确的分子间和分子内反应序列，从而形成单一产物。因此，GNR的结构在前体中就已编码。然而，最近的例子表明，不仅分子，而且反应发生的硬币金属表面，在决定纳米带结构方面也起着决定性作用。在这项工作中，我们使用扫描探针显微镜和X射线光电子能谱来研究10,10'-二氯-9,9'-联蒽（DCBA）在Ag(111)上的行为。我们的研究表明，Ag(111) 可以诱导形成七原子宽的扶手椅型GNRs（7-acGNRs）和3,1-手性GNRs（3,1-cGNRs），这表明单个表面上的单个分子可以反应生成不同的纳米带产物。我们还表明，共吸附的二溴苝可以促进DCBA中的表面辅助脱氢偶联，导致3,1-cGNRs的独家形成。
