期刊
CHINESE PHYSICS B
卷 30, 期 7, 页码 -出版社
IOP Publishing Ltd
DOI: 10.1088/1674-1056/abfbd0
关键词
on-surface synthesis; sulfur-doped cove-edged graphene nanoribbons; scanning tunneling microscopy; non-contact atomic force microscopy
资金
- National Natural Science Foundation of China [51761135130, 61888102, 21774076]
- National Key Research and Development Program of China [2018YFA0305800, 2019YFA0308500]
- Strategic Priority Research Program of Chinese Academy of Sciences [XDB30000000]
- International Partnership Program of Chinese Academy of Sciences [112111KYSB20160061]
- K C Wong Education Foundation
- Program of Shanghai Academic Research Leader [19XD1421700]
- DFG EnhanceNano [391979941]
The study reports the synthesis of sulfur-doped cove-edged GNRs on a gold surface, revealing the formation mechanism through microscopy measurements. The S-CGNRs have a smaller energy bandgap than undoped cove-edged GNRs, effectively tuning the bandgap.
The on-surface synthesis from predesigned organic precursors can yield graphene nanoribbons (GNRs) with atomically precise widths, edge terminations and dopants, which facilitate the tunning of their electronic structures. Here, we report the synthesis of novel sulfur-doped cove-edged GNRs (S-CGNRs) on Au(111) from a specifically designed precursor containing thiophene rings. Scanning tunneling microscopy and non-contact atomic force microscopy measurements elucidate the formation of S-CGNRs through subsequent polymerization and cyclodehydrogenation, which further result in crosslinked branched structures. Scanning tunneling spectroscopy results reveal the conduction band minimum of the S-CGNR locates at 1.2 eV. First-principles calculations show that the S-CGNR possesses an energy bandgap of 1.17 eV, which is evidently smaller than that of an undoped cove-edged GNR (1.7 eV), suggesting effective tuning of the bandgap by introducing sulfur atoms. Further increasing the coverage of precursors close to a monolayer results in the formation of linear-shaped S-CGNRs. The fabrication of S-CGNRs provides one more candidate in the GNR toolbox and promotes the future applications of heteroatom-doped graphene nanostructures.
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