蒽三烯和蒽六烯的表面合成与表征：兼具扶手椅型和锯齿型边缘的超短石墨烯纳米带
On-surface synthesis and characterization of Teranthene and Hexanthene: Ultrashort graphene nanoribbons with mixed armchair and zigzag edges
AI总结：
本研究针对兼具扶手椅与锯齿边缘的超短石墨烯纳米带反应活性研究不足的问题，合成蒽三烯和蒽六烯模型化合物，表征其结构并研究空气暴露下的反应活性，明确了不同边缘的轨道与振动模式起源。
摘要：
石墨烯纳米带（GNRs）展现出广泛的物理化学性质，这些性质关键取决于其宽度和边缘拓扑结构。化学稳定的扶手椅型边缘石墨烯纳米带（AGNRs）是带隙可随宽度调控的半导体，而锯齿型边缘石墨烯纳米带（ZGNRs）具有自旋极化边缘态，这使其在自旋电子学和量子技术领域颇具应用潜力。然而，这些态会显著提升其反应活性。对于在超高真空条件下于金属衬底上通过表面合成制备的GNRs而言，考虑到环境条件下的衬底转移和器件集成，锯齿型边缘的预期反应活性是一个重要问题，但相关研究仍十分匮乏。本研究以10-溴-9,9':10',9''-三蒽为前驱体，合成了蒽六烯（HA）和蒽三烯（TA）作为兼具扶手椅型与锯齿型边缘的超短GNRs模型化合物，通过扫描探针方法表征了其化学与电子结构，并利用拉曼光谱研究了其暴露于空气后的化学反应活性。我们对分子轨道和振动模式进行了详细识别，明确其起源于扶手椅型或锯齿型边缘，并基于特征拉曼光谱特征讨论了这些边缘的化学反应活性。
英文摘要：
Graphene nanoribbons (GNRs) exhibit a broad range of physicochemical properties that critically depend on their width and edge topology. While the chemically stable GNRs with armchair edges (AGNRs) are semiconductors with width-tunable band gap, GNRs with zigzag edges (ZGNRs) host spin-polarized edge states, which renders them interesting for applications in spintronic and quantum technologies. However, these states significantly increase their reactivity. For GNRs fabricated via on-surface synthesis under ultrahigh vacuum conditions on metal substrates, the expected reactivity of zigzag edges is a serious concern in view of substrate transfer and device integration under ambient conditions, but corresponding investigations are scarce. Using 10-bromo-9,9':10',9''-teranthracene as a precursor, we have thus synthesized hexanthene (HA) and teranthene (TA) as model compounds for ultrashort GNRs with mixed armchair and zigzag edges, characterized their chemical and electronic structure by means of scanning probe methods, and studied their chemical reactivity upon air exposure by Raman spectroscopy. We present a detailed identification of molecular orbitals and vibrational modes, assign their origin to armchair or zigzag edges, and discuss the chemical reactivity of these edges based on characteristic Raman spectral features.
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