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On-Surface Synthesis of 8- and 10-Armchair Graphene Nanoribbons
Kewei Sun1, Penghui Ji1, Junjie Zhang1
1Jiangsu Key Laboratory for Carbon Based Functional Materials & Devices, Institute of Functional Nano & Soft Materials (FUNSOM), Soochow University, Suzhou, 215123, P. R. China.
Abstract:
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.
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