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Tuning the morphology of chevron-type graphene nanoribbons by choice of annealing temperature

Journal Article · · Nano Research
 [1];  [1];  [1];  [1];  [1];  [1];  [2];  [3];  [4];  [1];  [3];  [1]
  1. University of Chinese Academy of Sciences, Beijing (China); Chinese Academy of Sciences (CAS), Beijing (China)
  2. Renmin Univ. of China, Beijing (China)
  3. University of Chinese Academy of Sciences, Beijing (China); Chinese Academy of Sciences (CAS), Beijing (China); Vanderbilt Univ., Nashville, TN (United States)
  4. Technische Univ. Dresden (Germany); Shanghai Jiao Tong Univ. (China)

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. Further, first-principles calculations show that the CGNRs exhibit negative differential resistance.

Research Organization:
Vanderbilt Univ., Nashville, TN (United States)
Sponsoring Organization:
USDOE Office of Science (SC); National Key Research and Development Projects of China; National Basic Research Program of China; National Natural Science Foundation of China (NSFC); Chinese Academy of Sciences (CAS)
DOE Contract Number:
FG02-09ER46554
OSTI ID:
1597914
Journal Information:
Nano Research, Vol. 11, Issue 12; ISSN 1998-0124
Publisher:
Springer
Country of Publication:
United States
Language:
English

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