Journal
SCIENTIFIC REPORTS
Volume 8, Issue -, Pages -Publisher
NATURE PUBLISHING GROUP
DOI: 10.1038/s41598-018-21704-3
Keywords
-
Categories
Funding
- Swedish Research Council
- Swedish Energy Agency (STEM)
- European Research Council under the European Union's Seventh Framework Program (FP7)/ERC [321319]
- Knut and Alice Wallenberg Foundation
- St. Petersburg State University [11.38.638.2013]
- Russian Foundation for Basic Research [15-02-06369]
- Science Foundation of Ireland [SFI P.I.09/IN.1]
- Japan Society for the Promotion of Science (JSPS KAKENHI) [15K05387, 16KT0047]
- Ministry of Education, Culture, Sports, Science and Technology (MEXT), Japan [5]
- MEXT program Development of Environmental Technology using Nanotechnology
Ask authors/readers for more resources
We investigate the bottom-up growth of N = 7 armchair graphene nanoribbons (7-AGNRs) from the 10,10'-dibromo-9,9'-bianthracene (DBBA) molecules on Ag(111) with the focus on the role of the organometallic (OM) intermediates. It is demonstrated that DBBA molecules on Ag(111) are partially debrominated at room temperature and lose all bromine atoms at elevated temperatures. Similar to DBBA on Cu(111), debrominated molecules form OM chains on Ag(111). Nevertheless, in contrast with the Cu(111) substrate, formation of polyanthracene chains from OM intermediates via an Ullmann-type reaction is feasible on Ag(111). Cleavage of C-Ag bonds occurs before the thermal threshold for the surface-catalyzed activation of C-H bonds on Ag(111) is reached, while on Cu(111) activation of C-H bonds occurs in parallel with the cleavage of the stronger C-Cu bonds. Consequently, while OM intermediates obstruct the Ullmann reaction between DBBA molecules on the Cu(111) substrate, they are required for the formation of polyanthracene chains on Ag(111). If the Ullmann-type reaction on Ag(111) is inhibited, heating of the OM chains produces nanographenes instead. Heating of the polyanthracene chains produces 7-AGNRs, while heating of nanographenes causes the formation of the disordered structures with the possible admixture of short GNRs.
Authors
I am an author on this paper
Click your name to claim this paper and add it to your profile.
Reviews
Recommended
No Data Available