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Functionalized Graphdiyne Nanowires: On‐Surface Synthesis and Assessment of Band Structure, Flexibility, and Information Storage Potential
Author(s) -
Klappenberger Florian,
Hellwig Raphael,
Du Ping,
Paintner Tobias,
Uphoff Martin,
Zhang Liding,
Lin Tao,
Moghanaki Bahare Abedin,
Paszkiewicz Mateusz,
Vobornik Ivana,
Fujii Jun,
Fuhr Olaf,
Zhang YiQi,
Allegretti Francesco,
Ruben Mario,
Barth Johannes V.
Publication year - 2018
Publication title -
small
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 3.785
H-Index - 236
eISSN - 1613-6829
pISSN - 1613-6810
DOI - 10.1002/smll.201704321
Subject(s) - surface modification , nanowire , materials science , graphyne , nanomaterials , nanotechnology , alkyne , vicinal , supramolecular chemistry , conjugated system , stacking , covalent bond , polymer , chemical physics , molecule , graphene , chemical engineering , chemistry , organic chemistry , engineering , composite material , catalysis
Abstract Carbon nanomaterials exhibit extraordinary mechanical and electronic properties desirable for future technologies. Beyond the popular sp 2 ‐scaffolds, there is growing interest in their graphdiyne‐related counterparts incorporating both sp 2 and sp bonding in a regular scheme. Herein, we introduce carbonitrile‐functionalized graphdiyne nanowires, as a novel conjugated, one‐dimensional (1D) carbon nanomaterial systematically combining the virtues of covalent coupling and supramolecular concepts that are fabricated by on‐surface synthesis. Specifically, a terphenylene backbone is extended with reactive terminal alkyne and polar carbonitrile (CN) moieties providing the required functionalities. It is demonstrated that the CN functionalization enables highly selective alkyne homocoupling forming polymer strands and gives rise to mutual lateral attraction entailing room‐temperature stable double‐stranded assemblies. By exploiting the templating effect of the vicinal Ag(455) surface, 40 nm long semiconducting nanowires are obtained and the first experimental assessment of their electronic band structure is achieved by angle‐resolved photoemission spectroscopy indicating an effective mass below 0.1 m 0 for the top of the highest occupied band. Via molecular manipulation it is showcased that the novel oligomer exhibits extreme mechanical flexibility and opens unexplored ways of information encoding in clearly distinguishable CN‐phenyl trans–cis species. Thus, conformational data storage with density of 0.36 bit nm −2 and temperature stability beyond 150 K comes in reach.