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45 results on '"Beyer, Doreen"'

1. Designer spin order in diradical nanographenes

Author

Zheng, Yuqiang, Li, Can, Xu, Chengyang, Beyer, Doreen, Yue, Xinlei, Zhao, Yan, Wang, Guanyong, Guan, Dandan, Li, Yaoyi, Zheng, Hao, Liu, Canhua, Liu, Junzhi, Wang, Xiaoqun, Luo, Weidong, Feng, Xinliang, Wang, Shiyong, and Jia, Jinfeng

Subjects
Condensed Matter - Mesoscale and Nanoscale Physics, Condensed Matter - Materials Science
Abstract

The magnetic properties of carbon materials are at present the focus of an intense research effort in physics, chemistry and materials science due to their potential applications in spintronics and quantum computations. Although the presence of spins in open-shell nanographenes has been recently confirmed, the ability to control magnetic coupling sign has remained elusive, but the most desirable. Here, we demonstrate an effective approach of engineering magnetic ground states in atomically precise open-shell bipartite/nonbipartite nanographenes using combined scanning probe techniques and mean-field Hubbard model calculations. The magnetic coupling sign between two spins has been controlled via breaking bipartite lattice symmetry of nanographenes. In addition, the exchange-interaction strength between two spins has been widely tuned by finely tailoring their spin density overlap, realizing a large exchange-interaction strength of 42 meV. Our demonstrated method provides ample opportunities for designer above-room-temperature magnetic phases and functionalities in graphene nanomaterials., Comment: 18 pages, 4 figures

Published
2020
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2. Collective All-Carbon Magnetism in Triangulene Dimers

Author

Mishra, Shantanu, Beyer, Doreen, Eimre, Kristjan, Ortiz, Ricardo, Fernandez-Rossier, Joaquin, Berger, Reinhard, Groening, Oliver, Pignedoli, Carlo A., Fasel, Roman, Feng, Xinliang, and Ruffieux, Pascal

Subjects
Condensed Matter - Mesoscale and Nanoscale Physics
Abstract

Triangular zigzag nanographenes, such as triangulene and its pi-extended homologues, have received widespread attention as organic nanomagnets for molecular spintronics, and may serve as building blocks for high-spin networks with long-range magnetic order - of immense fundamental and technological relevance. As a first step toward these lines, we present the on-surface synthesis and a proof-of-principle experimental study of magnetism in covalently bonded triangulene dimers. On-surface reactions of rationally-designed precursor molecules on Au(111) lead to the selective formation of triangulene dimers in which the triangulene units are either directly connected through their minority sublattice atoms, or are separated via a 1,4-phenylene spacer. The chemical structures of the dimers have been characterized by bond-resolved scanning tunneling microscopy. Scanning tunneling spectroscopy and inelastic electron tunneling spectroscopy measurements reveal collective singlet-triplet spin excitations in the dimers, demonstrating efficient inter-triangulene magnetic coupling., Comment: 4 figures plus supporting information

Published
2020
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5. Formation and Polymorphism of Semiconducting K2SiH6 and Strategy for Metallization

Author

Vekilova, Olga Yu., Beyer, Doreen C., Bhat, Shrikant, Farla, Robert, Baran, Volodymyr, Simak, Sergei I., Kohlmann, Holger, Häussermann, Ulrich, Spektor, Kristina, Vekilova, Olga Yu., Beyer, Doreen C., Bhat, Shrikant, Farla, Robert, Baran, Volodymyr, Simak, Sergei I., Kohlmann, Holger, Häussermann, Ulrich, and Spektor, Kristina

Abstract

K2SiH6, crystallizing in the cubic K2PtCl6 structure type (Fm3̅m), features unusual hypervalent SiH62– complexes. Here, the formation of K2SiH6 at high pressures is revisited by in situ synchrotron diffraction experiments, considering KSiH3 as a precursor. At the investigated pressures, 8 and 13 GPa, K2SiH6 adopts the trigonal (NH4)2SiF6 structure type (P3̅m1) upon formation. The trigonal polymorph is stable up to 725 °C at 13 GPa. At room temperature, the transition into an ambient pressure recoverable cubic form occurs below 6.7 GPa. Theory suggests the existence of an additional, hexagonal, variant in the pressure interval 3–5 GPa. According to density functional theory band structure calculations, K2SiH6 is a semiconductor with a band gap around 2 eV. Nonbonding H-dominated states are situated below and Si–H anti-bonding states are located above the Fermi level. Enthalpically feasible and dynamically stable metallic variants of K2SiH6 may be obtained when substituting Si partially by Al or P, thus inducing p- and n-type metallicity, respectively. Yet, electron–phonon coupling appears weak, and calculated superconducting transition temperatures are <1 K.

Published
2023
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8. Formation and Polymorphism of Semiconducting K2SiH6and Strategy for Metallization

Author

Vekilova, Olga Yu., Beyer, Doreen C., Bhat, Shrikant, Farla, Robert, Baran, Volodymyr, Simak, Sergei I., Kohlmann, Holger, Häussermann, Ulrich, and Spektor, Kristina

Abstract

K2SiH6, crystallizing in the cubic K2PtCl6structure type (Fm3̅m), features unusual hypervalent SiH62–complexes. Here, the formation of K2SiH6at high pressures is revisited by in situ synchrotron diffraction experiments, considering KSiH3as a precursor. At the investigated pressures, 8 and 13 GPa, K2SiH6adopts the trigonal (NH4)2SiF6structure type (P3̅m1) upon formation. The trigonal polymorph is stable up to 725 °C at 13 GPa. At room temperature, the transition into an ambient pressure recoverable cubic form occurs below 6.7 GPa. Theory suggests the existence of an additional, hexagonal, variant in the pressure interval 3–5 GPa. According to density functional theory band structure calculations, K2SiH6is a semiconductor with a band gap around 2 eV. Nonbonding H-dominated states are situated below and Si–H anti-bonding states are located above the Fermi level. Enthalpically feasible and dynamically stable metallic variants of K2SiH6may be obtained when substituting Si partially by Al or P, thus inducing p- and n-type metallicity, respectively. Yet, electron–phonon coupling appears weak, and calculated superconducting transition temperatures are <1 K.

Published
2023
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11. WHISPER

Author

Beyer, Doreen E.

Subjects
Literature/writing
Abstract

-

Published
2021

12. NEWELL'S SHEARWATER

Author

Beyer, Doreen E.

Subjects
Literature/writing
Abstract

-

Published
2021

13. MEMORIES OF HOME

Author

Beyer, Doreen E.

Subjects
Literature/writing
Abstract

-

Published
2021

19. Designer spin order in diradical nanographenes

Author

Zheng, Yuqiang, primary, Li, Can, additional, Xu, Chengyang, additional, Beyer, Doreen, additional, Yue, Xinlei, additional, Zhao, Yan, additional, Wang, Guanyong, additional, Guan, Dandan, additional, Li, Yaoyi, additional, Zheng, Hao, additional, Liu, Canhua, additional, Liu, Junzhi, additional, Wang, Xiaoqun, additional, Luo, Weidong, additional, Feng, Xinliang, additional, Wang, Shiyong, additional, and Jia, Jinfeng, additional

Published
2020
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20. Collective All‐Carbon Magnetism in Triangulene Dimers**

Author

Mishra, Shantanu, primary, Beyer, Doreen, additional, Eimre, Kristjan, additional, Ortiz, Ricardo, additional, Fernández‐Rossier, Joaquín, additional, Berger, Reinhard, additional, Gröning, Oliver, additional, Pignedoli, Carlo A., additional, Fasel, Roman, additional, Feng, Xinliang, additional, and Ruffieux, Pascal, additional

Published
2020
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21. Engineering of Magnetic Coupling in Nanographene

Author

Zheng, Yuqiang, primary, Li, Can, additional, Zhao, Yan, additional, Beyer, Doreen, additional, Wang, Guanyong, additional, Xu, Chengyang, additional, Yue, Xinlei, additional, Chen, Yupeng, additional, Guan, Dan-Dan, additional, Li, Yao-Yi, additional, Zheng, Hao, additional, Liu, Canhua, additional, Luo, Weidong, additional, Feng, Xinliang, additional, Wang, Shiyong, additional, and Jia, Jinfeng, additional

Published
2020
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22. Topological Defect-Induced Magnetism in a Nanographene

Author

Mishra, Shantanu, primary, Beyer, Doreen, additional, Berger, Reinhard, additional, Liu, Junzhi, additional, Gröning, Oliver, additional, Urgel, José I., additional, Müllen, Klaus, additional, Ruffieux, Pascal, additional, Feng, Xinliang, additional, and Fasel, Roman, additional

Published
2020
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23. Publisher Correction: Topological frustration induces unconventional magnetism in a nanographene

Author

Mishra, Shantanu, primary, Beyer, Doreen, additional, Eimre, Kristjan, additional, Kezilebieke, Shawulienu, additional, Berger, Reinhard, additional, Gröning, Oliver, additional, Pignedoli, Carlo A., additional, Müllen, Klaus, additional, Liljeroth, Peter, additional, Ruffieux, Pascal, additional, Feng, Xinliang, additional, and Fasel, Roman, additional

Published
2019
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24. Topological frustration induces unconventional magnetism in a nanographene

Author

Mishra, Shantanu, primary, Beyer, Doreen, additional, Eimre, Kristjan, additional, Kezilebieke, Shawulienu, additional, Berger, Reinhard, additional, Gröning, Oliver, additional, Pignedoli, Carlo A., additional, Müllen, Klaus, additional, Liljeroth, Peter, additional, Ruffieux, Pascal, additional, Feng, Xinliang, additional, and Fasel, Roman, additional

Published
2019
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26. Graphene Nanoribbons Derived from Zigzag Edge-Encased Poly(para-2,9-dibenzo[bc,kl]coronenylene) Polymer Chains

Author

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, University of Zurich, and Berger, Reinhard

Subjects
10120 Department of Chemistry, 1303 Biochemistry, Colloid and Surface Chemistry, zigzag edge, Graphene Nanoribbons, surface synthesis, 1503 Catalysis, 540 Chemistry, ddc:540, 1600 General Chemistry, 1505 Colloid and Surface Chemistry, Zick-Zack-Kante, Graphen-Nanobänder, Oberflächensynthese, General Chemistry, Biochemistry, Catalysis
Abstract

This document is the unedited Author’s version of a Submitted Work that was subsequently accepted for publication in JACSafter peer Review. Abstract 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.

Published
2019

27. Synthesis and Characterization of π-Extended Triangulene

Author

Mishra, Shantanu, Beyer, Doreen, Eimre, Kristjan, Liu, Junzhi, Berger, Reinhard, Gröning, Oliver, Pignedoli, Carlo A., Müllen, Klaus, Fasel, Roman, Feng, Xinliang, Ruffieux, Pascal, Mishra, Shantanu, Beyer, Doreen, Eimre, Kristjan, Liu, Junzhi, Berger, Reinhard, Gröning, Oliver, Pignedoli, Carlo A., Müllen, Klaus, Fasel, Roman, Feng, Xinliang, and Ruffieux, Pascal

Abstract

The electronic and magnetic properties of nanographenes strongly depend on their size, shape and topology. While many nanographenes present a closedshell electronic structure, certain molecular topologies may lead to an open-shell structure. Triangular-shaped nanographenes with zigzag edges, which exist as neutral radicals, are of considerable interest both in fundamental science and for future technologies aimed at harnessing their intrinsic high-spin magnetic ground states for spinbased operations and information storage. Their synthesis, however, is extremely challenging owing to the presence of unpaired electrons, which confers them with enhanced reactivity. We report a combined in-solution and onsurface synthesis of π-extended triangulene, a non-Kekulé nanographene with the structural formula C33H15, consisting of ten benzene rings fused in a triangular fashion. The distinctive topology of the molecule entails the presence of three unpaired electrons that couple to form a spin quartet ground state. The structure of individual molecules adsorbed on an inert gold surface is confirmed through ultrahigh-resolution scanning tunneling microscopy. The electronic properties are studied via scanning tunneling spectroscopy, wherein unambiguous spectroscopic signatures of the spin-split singly occupied molecular orbitals are found. Detailed insight into its properties is obtained through tight-binding, density functional and many-body perturbation theory calculations, with the latter providing evidence that π-extended triangulene retains its open-shell quartet ground state on the surface. Our work provides unprecedented access to open-shell nanographenes with high-spin ground states, potentially useful in carbon-based spintronics.

Published
2019

28. Topological defect-induced magnetism in a nanographene

Author

Mishra, Shantanu, Beyer, Doreen, Berger, Reinhard, Liu, Junzhi, Gröning, Oliver, Urgel, José I., Müllen, Klaus, Ruffieux, Pascal, Feng, Xinliang, Fasel, Roman, Mishra, Shantanu, Beyer, Doreen, Berger, Reinhard, Liu, Junzhi, Gröning, Oliver, Urgel, José I., Müllen, Klaus, Ruffieux, Pascal, Feng, Xinliang, and Fasel, Roman

Abstract

The on-surface reactions of 10-bromo-10'-(2,6-dimethylphenyl)-9,9'-bianthracene on Au(111) surface have been investigated by a combination of bond-resolved scanning tunneling microscopy, scanning tunneling spectroscopy, and tightbinding and mean-field Hubbard calculations. The reactions afford the synthesis of two open-shell nanographenes (1a and 1b) exhibiting different scenarios of all-carbon magnetism. 1a, an allbenzenoid nanographene with previously unreported triangulenelike termini, contains a high proportion of zigzag edges, which endows it with an exceedingly low frontier gap of 110 meV and edge-localized states. The dominant reaction product (1b) is a non-benzenoid nanographene consisting of a single pentagonal ring in a benzenoid framework. The presence of this nonbenzenoid topological defect, which alters the bond connectivity in the hexagonal lattice, results in a non-Kekulé nanographene with a spin S = ½, which is detected as a Kondo resonance. Our work provides evidence of all-carbon magnetism, and motivates the use of topological defects as structural elements toward engineering agnetism in carbon-based nanomaterials for spintronics.

Published
2019

30. Synthesis and Characterization of π-Extended Triangulene

Author

Mishra, Shantanu, primary, Beyer, Doreen, additional, Eimre, Kristjan, additional, Liu, Junzhi, additional, Berger, Reinhard, additional, Gröning, Oliver, additional, Pignedoli, Carlo A., additional, Müllen, Klaus, additional, Fasel, Roman, additional, Feng, Xinliang, additional, and Ruffieux, Pascal, additional

Published
2019
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31. Correction to “Graphene Nanoribbons Derived from Zigzag Edge-Encased Poly(para-2,9-dibenzo[bc,kl]coronenylene) Polymer Chains”

Author

Beyer, Doreen, primary, Wang, Shiyong, additional, Pignedoli, Carlo A., additional, Melidonie, Jason, additional, Yuan, Bingkai, additional, Li, Can, additional, Wilhelm, Jan, additional, Ruffieux, Pascal, additional, Berger, Reinhard, additional, Müllen, Klaus, additional, Fasel, Roman, additional, and Feng, Xinliang, additional

Published
2019
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33. The mechanochemical Scholl reaction – a solvent-free and versatile graphitization tool

Author

Grätz, Sven, Beyer, Doreen, Tkachova, Valeriya, Hellmann, Sarah, Berger, Reinhard, Feng, Xinliang, Borchardt, Lars, Grätz, Sven, Beyer, Doreen, Tkachova, Valeriya, Hellmann, Sarah, Berger, Reinhard, Feng, Xinliang, and Borchardt, Lars

Abstract

Herein, we report on the mechanochemical Scholl reaction of dendritic oligophenylene precursors to produce benchmark nanographenes such as hexa-peri-hexabenzocoronene (HBC), triangular shaped C60 and expanded C222 under solvent-free conditions. The solvent-free approach overcomes the bottleneck of solubility limitation in this well-known and powerful reaction. The mechanochemical approach allows tracking the reaction process by in situ pressure measurements. The quality of produced nanographenes has been confirmed by MALDI-TOF mass spectrometry and UV-Vis absorption spectroscopy. This approach paves the way towards gram scale and environmentally benign synthesis of extended nanographenes and possibly graphene nanoribbons suitable for application in carbon based electronics or energy applications.

Published
2018

37. Identification of Antigenic Proteins of aTheileriaSpecies Pathogenic for Small Ruminants in China Recognized by Antisera of Infected Animals

Author

MIRANDA, JOANA, primary, STUMME, BARBARA, additional, BEYER, DOREEN, additional, CRUZ, HELDER, additional, OLIVA, ABEL GONZÁLEZ, additional, BAKHEIT, MOHAMMED, additional, WICKLEIN, DANIEL, additional, YIN, HONG, additional, LOU, JIANXUN, additional, AHMED, JABBAR S., additional, and SEITZER, ULRIKE, additional

Published
2004
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40. Characterization of a polymorphic Theileria annulata surface protein (TaSP) closely related to PIM of Theileria parva: implications for use in diagnostic tests and subunit vaccines

Author

Schnittger, Leonhard, primary, Katzer, Frank, additional, Biermann, Reinhild, additional, Shayan, Parviz, additional, Boguslawski, Kati, additional, McKellar, Sue, additional, Beyer, Doreen, additional, Shiels, Brian R., additional, and Ahmed, Jabbar S., additional

Published
2002
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41. Collective All‐Carbon Magnetism in Triangulene Dimers

Author

Mishra, Shantanu, Beyer, Doreen, Eimre, Kristjan, Ortiz, Ricardo, Fernández‐Rossier, Joaquín, Berger, Reinhard, Gröning, Oliver, Pignedoli, Carlo A., Fasel, Roman, Feng, Xinliang, and Ruffieux, Pascal

Subjects
530 Physics, 540 Chemistry, Condensed Matter::Strongly Correlated Electrons, 3. Good health
Abstract

Triangular zigzag nanographenes, such as triangulene and its π‐extended homologues, have received widespread attention as organic nanomagnets for molecular spintronics, and may serve as building blocks for high‐spin networks with long‐range magnetic order—of immense fundamental and technological relevance. As a first step toward these lines, we present the on‐surface synthesis and a proof‐of‐principle experimental study of magnetism in covalently bonded triangulene dimers. On‐surface reactions of rationally designed precursor molecules on Au(111) lead to the selective formation of triangulene dimers in which the triangulene units are either directly connected through their minority sublattice atoms, or are separated via a 1,4‐phenylene spacer. The chemical structures of the dimers have been characterized by bond‐resolved scanning tunneling microscopy. Scanning tunneling spectroscopy and inelastic electron tunneling spectroscopy measurements reveal collective singlet‐triplet spin excitations in the dimers, demonstrating efficient inter‐triangulene magnetic coupling.

42. Engineering of Magnetic Coupling in Nanographene.

Author

Yuqiang Zheng, Can Li, Yan Zhao, Beyer, Doreen, Guanyong Wang, Chengyang Xu, Xinlei Yue, Yupeng Chen, Dan-Dan Guan, Yao-Yi Li, Hao Zheng, Canhua Liu, Weidong Luo, Xinliang Feng, Shiyong Wang, and Jinfeng Jia

Subjects
*MAGNETIC coupling, *SCANNING force microscopy, *ATOMIC force microscopy, *SCANNING tunneling microscopy, *TUNNELING spectroscopy, *METALS at low temperatures, *MEAN field theory, *EXCHANGE interactions (Magnetism)
Abstract

Nanographenes with sublattice imbalance host a net spin according to Lieb's theorem for bipartite lattices. Here, we report the on-surface synthesis of atomically precise nanographenes and their atomic-scale characterization on a gold substrate by using low-temperature noncontact atomic force microscopy and scanning tunneling spectroscopy. Our results clearly confirm individual nanographenes host a single spin of S=1/2 via the Kondo effect. In covalently linked nanographene dimers, two spins are antiferromagnetically coupled with each other as revealed by inelastic spin-flip excitation spectroscopy. The magnetic exchange interaction in dimers can be well engineered by tuning the local spin density distribution near the connection region, consistent with mean-field Hubbard model calculations. Our work clearly reveals the emergence of magnetism in nanographenes and provides an efficient way to further explore the carbon-based magnetism. [ABSTRACT FROM AUTHOR]

Published
2020
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43. Formation and Polymorphism of Semiconducting K 2 SiH 6 and Strategy for Metallization.

Author

Vekilova OY, Beyer DC, Bhat S, Farla R, Baran V, Simak SI, Kohlmann H, Häussermann U, and Spektor K

Abstract

K 2 SiH 6 , crystallizing in the cubic K 2 PtCl 6 structure type ( Fm 3̅ m ), features unusual hypervalent SiH 6 2- complexes. Here, the formation of K 2 SiH 6 at high pressures is revisited by in situ synchrotron diffraction experiments, considering KSiH 3 as a precursor. At the investigated pressures, 8 and 13 GPa, K 2 SiH 6 adopts the trigonal (NH 4 ) 2 SiF 6 structure type ( P 3̅ m 1) upon formation. The trigonal polymorph is stable up to 725 °C at 13 GPa. At room temperature, the transition into an ambient pressure recoverable cubic form occurs below 6.7 GPa. Theory suggests the existence of an additional, hexagonal, variant in the pressure interval 3-5 GPa. According to density functional theory band structure calculations, K 2 SiH 6 is a semiconductor with a band gap around 2 eV. Nonbonding H-dominated states are situated below and Si-H anti-bonding states are located above the Fermi level. Enthalpically feasible and dynamically stable metallic variants of K 2 SiH 6 may be obtained when substituting Si partially by Al or P, thus inducing p- and n-type metallicity, respectively. Yet, electron-phonon coupling appears weak, and calculated superconducting transition temperatures are <1 K.

Published
2023
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45. Graphene Nanoribbons Derived from Zigzag Edge-Encased Poly( para-2,9-dibenzo[ bc, kl]coronenylene) Polymer Chains.

Author

Beyer D, Wang S, Pignedoli CA, Melidonie J, Yuan B, Li C, Wilhelm J, Ruffieux P, Berger R, Müllen K, Fasel R, and Feng X

Abstract

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.

Published
2019
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