Synthesis of Graphene Nanoribbons on a Kinked Au Surface: Revealing the Frontier Valence Band at the Brillouin Zone Center,The Journal of Physical Chemistry C

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Synthesis of Graphene Nanoribbons on a Kinked Au Surface: Revealing the Frontier Valence Band at the Brillouin Zone Center
The Journal of Physical Chemistry C ( IF 3.3 ) Pub Date : 2020-06-23 , DOI: 10.1021/acs.jpcc.0c02801
Afaf El-Sayed _{1,

2,

3} , Ignacio Piquero-Zulaica _{4,

5} , Zakaria M. Abd El-Fattah _{1,

3} , Lukáš Kormoš ₆ , Khadiza Ali ₄ , Andrew Weber _{3,

4} , Jens Brede ₄ , Dimas G. de Oteyza _{3,

4,

7} , Jorge Lobo-Checa ₈ , J. Enrique Ortega _{3,

4,

9} , Martina Corso _{3,

4}

Affiliation

Graphene nanoribbons (GNRs) can be synthesized with atomic precision through on-surface chemistry of self-assembled organic precursors on metal surfaces. Here, we examine the growth of seven-armchair GNRs (7-AGNRs) on the Au(16 14 15) vicinal surface, namely, a surface vicinal to Au(111) that features kinked steps. During the thermal activation of the polymerization and cyclodehydrogenation processes that produce the GNRs, the kinked substrate undergoes a strong step-edge reshaping, accompanied by a massive missing-row reconstruction within (111) terraces that aligns GNRs preferentially along two equivalent [11̅0] directions. Using angle-resolved photoemission, we are able to detect the occupied frontier band of the 7-AGNR at the center of the first Brillouin zone, as predicted by theoretical calculations. This allows to unambiguously determine the relevant 7-AGNR band properties, namely, energy and effective mass.

中文翻译：

在弯曲的金表面上合成石墨烯纳米带：揭示布里渊区中心的前沿价带

石墨烯纳米带（GNR）可以通过金属表面上自组装有机前体的表面化学反应以原子精度合成。在这里，我们检查Au（16 14 15）邻近表面，即Au（111）邻近的具有扭结台阶的表面，生长了七个扶手椅的GNR（7-AGNR）。在产生GNR的聚合和环脱氢过程的热活化过程中，扭结的底材经历了强烈的阶跃边缘整形，并伴随着（111）阶地内的大量缺失行重建，这些梯级优先将GNR沿两个等效的[11̅0]方向对齐。如理论计算所预测，使用角度分辨的光发射，我们能够检测到第一个布里渊区中心的7-AGNR占据的前沿带。

更新日期：2020-07-16

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