| Autor: |
Beyer, Doreen, Wang, Shiyong, Pignedoli, Carlo A., Melidonie, Jason, Yuan, Bingkai, Li, Can, Wilhelm, Jan, Ruffieux, Pascal, Berger, Reinhard, Müllen, Klaus, Fasel, Roman, Feng, Xinliang |
| Jazyk: |
angličtina |
| Rok vydání: |
2019 |
| Předmět: |
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| Druh dokumentu: |
Článek |
| ISSN: |
1520-5126 |
| DOI: |
10.1021/jacs.8b10407 |
| Popis: |
In this work, we demonstrate the bottom-up on-surface synthesis of poly(para-dibenzo[bc,kl]-coronenylene) (PPDBC), a zigzag edge-encased analog of poly(para-phenylene) (PPP), and its lateral fusion into zigzag edge-extended graphene nanoribbons (zeeGNRs). Toward this end, we designed a dihalogenated di(meta-xylyl)anthracene monomer displaying strategic methyl groups at the substituted phenyl ring and investigated its applicability as precursor in the thermally induced surface-assisted polymerization and cyclodehydrogenation. The structure of the resulting zigzag edge-rich (70%) polymer PPDBC was unambiguously confirmed by scanning tunneling microscopy (STM) and non-contact atomic force microscopy (nc-AFM). Remarkably, by further thermal treatment at 450 °C two and three aligned PPDBC chains can be laterally fused into expanded zeeGNRs, with a ribbon width of nine (N = 9) up to 17 (N = 17) carbon atoms. Moreover, the resulting zeeGNRs exhibit a high ratio of zigzag (67%) vs armchair (25%) edge segments and feature electronic band gaps as low as 0.9 eV according to gaps quasiparticle calculations. |
| Databáze: |
Networked Digital Library of Theses & Dissertations |
| Externí odkaz: |
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