Graphene Nanoribbons Derived from Zigzag Edge-Encased Poly(para-2,9-dibenzo[bc,kl]coronenylene) Polymer Chains
| Autor: | Carlo A. Pignedoli, Roman Fasel, Klaus Müllen, Bingkai Yuan, Reinhard Berger, Jason Melidonie, Jan Wilhelm, Pascal Ruffieux, Can Li, Doreen Beyer, Shiyong Wang, Xinliang Feng |
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| Rok vydání: | 2019 |
| Předmět: |
530 Physics
02 engineering and technology Thermal treatment 010402 general chemistry Ring (chemistry) 01 natural sciences Biochemistry Catalysis law.invention chemistry.chemical_compound Colloid and Surface Chemistry law 540 Chemistry chemistry.chemical_classification General Chemistry Polymer 021001 nanoscience & nanotechnology 0104 chemical sciences Crystallography Monomer Zigzag chemistry Polymerization 570 Life sciences biology Scanning tunneling microscope 0210 nano-technology Graphene nanoribbons |
| Zdroj: | 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 (2019). Graphene Nanoribbons Derived from Zigzag Edge-Encased Poly( para-2,9-dibenzo[ bc, kl ]coronenylene) Polymer Chains. Journal of the American Chemical Society, 141(7), pp. 2843-2846. American Chemical Society 10.1021/jacs.8b10407 Journal of the American Chemical Society |
| ISSN: | 1520-5126 0002-7863 |
| 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: | OpenAIRE |
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