期刊
NANO RESEARCH
卷 11, 期 12, 页码 6190-6196出版社
TSINGHUA UNIV PRESS
DOI: 10.1007/s12274-018-2136-3
关键词
chevron-type graphene nanoribbon; C-S bond cleavage; negative differential resistance; scanning tunneling; microscopy (STM); noncontact atomic force microscopy (NC-AFM); first-principles calculations
类别
资金
- National Key Research and Development Projects of China [2016YFA0202300]
- National Basic Research Program of China [2013CBA01600]
- National Natural Science Foundation of China [61390501, 51572290, 61306015, 61471337, 51325204, 11604373]
- Chinese Academy of Sciences [1731300500015, XDB07030100]
- CAS Pioneer Hundred Talents Program
- US Department of Energy [DE-FG02-09ER46554]
- McMinn Endowment
Bottom-up synthesis of graphene nanoribbons (GNRs) by surface-assisted polymerization and cyclodehydrogenation of specifically designed precursor monomers has been shown to yield precise edges and doping. Here we use a precursor monomer containing sulfur atoms to fabricate nanostructures on a Au(111) surface at different annealing temperatures. The nanostructures have distinct configurations, varying from sulfur-doped polymers to sulfur-doped chevron-type GNRs (CGNRs) and, finally, pristine graphene nanoribbons with specific edges of periodic five-member carbon rings. Non-contact atomic force microscopy provides clear evidence for the cleavage of C-S bonds and formation of pristine CGNRs at elevated annealing temperatures. First-principles calculations show that the CGNRs exhibit negative differential resistance.
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