On-Surface Synthesis of 8- and 10-Armchair Graphene Nanoribbons

Kewei Sun; Penghui Ji; Junjie Zhang; Jinxi Wang; Xuechao Li; Xin Xu; Haiming Zhang; Lifeng Chi

doi:10.1002/smll.201804526

On-Surface Synthesis of 8- and 10-Armchair Graphene Nanoribbons

Small. 2019 Apr;15(15):e1804526. doi: 10.1002/smll.201804526. Epub 2019 Mar 20.

Authors

Kewei Sun¹, Penghui Ji¹, Junjie Zhang¹, Jinxi Wang¹, Xuechao Li¹, Xin Xu², Haiming Zhang¹, Lifeng Chi¹

Affiliations

¹ Jiangsu Key Laboratory for Carbon Based Functional Materials & Devices, Institute of Functional Nano & Soft Materials (FUNSOM), Soochow University, Suzhou, 215123, P. R. China.
² Key Laboratory of Organic Synthesis of Jiangsu Province, College of Chemistry, Chemical Engineering and Materials Science, Soochow University, Suzhou, 215123, P. R. China.

PMID: 30891917
DOI: 10.1002/smll.201804526

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.

Keywords: band gap; graphene nanoribbons; on-surface synthesis; scanning tunneling microscopy/spectroscopy.

Abstract

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