8 臂和 10 臂扶手椅型石墨烯纳米带的表面合成
On-Surface Synthesis of 8- and 10-Armchair Graphene Nanoribbons.
作者信息
Sun Kewei, Ji Penghui, Zhang Junjie, Wang Jinxi, Li Xuechao, Xu Xin, Zhang Haiming, Chi Lifeng
机构信息
Jiangsu Key Laboratory for Carbon Based Functional Materials & Devices, Institute of Functional Nano & Soft Materials (FUNSOM), Soochow University, Suzhou, 215123, P. R. China.
Key Laboratory of Organic Synthesis of Jiangsu Province, College of Chemistry, Chemical Engineering and Materials Science, Soochow University, Suzhou, 215123, P. R. China.
出版信息
Small. 2019 Apr;15(15):e1804526. doi: 10.1002/smll.201804526. Epub 2019 Mar 20.
Armchair graphene nanoribbons (AGNRs) with 8 and 10 carbon atoms in width (8- and 10-AGNRs) are synthesized on Au (111) surfaces via lateral fusion of nanoribbons that belong to different subfamilies. Poly-para-phenylene (3-AGNR) chains are pre-synthesized as ladder ribbons on Au (111). Subsequently, synthesized 5- and 7-AGNRs can laterally fuse with 3-AGNRs upon annealing at higher temperature, producing 8- and 10-AGNRs, respectively. The synthetic process, and their geometric and electronic structures are characterized by scanning tunneling microscopy/spectroscopy (STM/STS). STS investigations reveal the band gap of 10-AGNR (2.0 ± 0.1 eV) and a large apparent band gap of 8-AGNRs (2.3 ± 0.1 eV) on Au (111) surface.
通过不同亚家族纳米带的横向融合，在金（111）表面合成了宽度为8个和10个碳原子的扶手椅型石墨烯纳米带（8 -和10 - AGNRs）。聚对亚苯基（3 - AGNR）链预先作为梯形带在金（111）上合成。随后，合成的5 -和7 - AGNRs在较高温度退火时可与3 - AGNRs横向融合，分别生成8 -和10 - AGNRs。通过扫描隧道显微镜/光谱（STM/STS）对合成过程及其几何和电子结构进行了表征。STS研究揭示了在金（111）表面上10 - AGNR的带隙为（2.0 ± 0.1 eV）以及8 - AGNRs的大表观带隙为（2.3 ± 0.1 eV）。
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