Cove-Edged Graphene Nanoribbons with Incorporation of Periodic Zigzag-Edge Segments

之字形的 石墨烯 石墨烯纳米带 带隙 拉曼光谱 化学 小海湾 聚合物 纳米技术 结晶学 光电子学 材料科学 光学 几何学 物理 有机化学 地质学 地貌学 数学
作者
Xu Wang,Ji Ma,Wenhao Zheng,Silvio Osella,Nicolás Arisnabarreta,Jörn Droste,Gianluca Serra,Oleksandr Ivasenko,Andrea Lucotti,David Beljonne,Mischa Bonn,Xiangyang Liu,Michael Ryan Hansen,Matteo Tommasini,Steven De Feyter,Junzhi Liu,Hai I. Wang,Xinliang Feng
出处
期刊:Journal of the American Chemical Society [American Chemical Society]
卷期号:144 (1): 228-235 被引量:44
标识
DOI:10.1021/jacs.1c09000
摘要

Structurally precision graphene nanoribbons (GNRs) are promising candidates for next-generation nanoelectronics due to their intriguing and tunable electronic structures. GNRs with hybrid edge structures often confer them unique geometries associated with exotic physicochemical properties. Herein, a novel type of cove-edged GNRs with periodic short zigzag-edge segments is demonstrated. The bandgap of this GNR family can be tuned using an interplay between the length of the zigzag segments and the distance of two adjacent cove units along the opposite edges, which can be converted from semiconducting to nearly metallic. A family member with periodic cove-zigzag edges based on N = 6 zigzag-edged GNR, namely 6-CZGNR-(2,1), is successfully synthesized in solution through the Scholl reaction of a unique snakelike polymer precursor (10) that is achieved by the Yamamoto coupling of a structurally flexible S-shaped phenanthrene-based monomer (1). The efficiency of cyclodehydrogenation of polymer 10 toward 6-CZGNR-(2,1) is validated by FT-IR, Raman, and UV-vis spectroscopies, as well as by the study of two representative model compounds (2 and 3). Remarkably, the resultant 6-CZGNR-(2,1) exhibits an extended and broad absorption in the near-infrared region with a record narrow optical bandgap of 0.99 eV among the reported solution-synthesized GNRs. Moreover, 6-CZGNR-(2,1) exhibits a high macroscopic carrier mobility of ∼20 cm2 V-1 s-1 determined by terahertz spectroscopy, primarily due to the intrinsically small effective mass (m*e = m*h = 0.17 m0), rendering this GNR a promising candidate for nanoelectronics.
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