Zhao Xin-Jing, Hou Hao, Fan Xue-Ting, Wang Yu, Liu Yu-Min, Tang Chun, Liu Shun-He, Ding Peng-Peng, Cheng Jun, Lin Dong-Hai, Wang Cheng, Yang Ye, Tan Yuan-Zhi
Collaborative Innovation Center of Chemistry for Energy Materials, State Key Laboratory for Physical Chemistry of Solid Surfaces, and Department of Chemistry, College of Chemistry and Chemical Engineering, Xiamen University, 361005, Xiamen, China.
Nat Commun. 2019 Jul 11;10(1):3057. doi: 10.1038/s41467-019-11098-9.
Bilayer graphene consists of two stacked graphene layers bound together by van der Waals interaction. As the molecular analog of bilayer graphene, molecular bilayer graphene (MBLG) can offer useful insights into the structural and functional properties of bilayer graphene. However, synthesis of MBLG, which requires discrete assembly of two graphene fragments, has proved to be challenging. Here, we show the synthesis and characterization of two structurally well-defined MBLGs, both consisting of two π-π stacked nanographene sheets. We find they have excellent stability against variation of concentration, temperature and solvents. The MBLGs show sharp absorption and emission peaks, and further time-resolved spectroscopic studies reveal drastically different lifetimes for the bright and dark Davydov states in these MBLGs.
双层石墨烯由通过范德华相互作用结合在一起的两个堆叠的石墨烯层组成。作为双层石墨烯的分子类似物，分子双层石墨烯（MBLG）可以为双层石墨烯的结构和功能特性提供有用的见解。然而，MBLG的合成需要两个石墨烯片段的离散组装，事实证明这具有挑战性。在这里，我们展示了两种结构明确的MBLG的合成与表征，它们均由两个π-π堆叠的纳米石墨烯片组成。我们发现它们在浓度、温度和溶剂变化方面具有出色的稳定性。MBLG显示出尖锐的吸收和发射峰，进一步的时间分辨光谱研究揭示了这些MBLG中明亮和暗态达维多夫态的寿命截然不同。
