Heterometallic Benzenehexathiolato Coordination Nanosheets: Periodic Structure Improves Crystallinity and Electrical Conductivity.
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Authors
Toyoda, Ryojun
Fukui, Naoya
Tjhe, Dionisius HL
Selezneva, Ekaterina
Maeda, Hiroaki
Bourgès, Cédric
Tan, Choon Meng
Takada, Kenji
Sun, Yuanhui
Kamiya, Kazuhide
Masunaga, Hiroyasu
Mori, Takao
Sasaki, Sono
Nishihara, Hiroshi
Publication Date
2022-01-18Journal Title
Adv Mater
ISSN
0935-9648
Publisher
Wiley
Type
Article
This Version
AM
Metadata
Show full item recordCitation
Toyoda, R., Fukui, N., Tjhe, D. H., Selezneva, E., Maeda, H., Bourgès, C., Tan, C. M., et al. (2022). Heterometallic Benzenehexathiolato Coordination Nanosheets: Periodic Structure Improves Crystallinity and Electrical Conductivity.. Adv Mater https://doi.org/10.1002/adma.202106204
Abstract
Coordination nanosheets are an emerging class of two-dimensional, bottom-up materials having fully π-conjugated, planar, graphite-like structures with high electrical conductivities. Since their discovery, great effort has been devoted to expand the variety of coordination nanosheets; however, in most cases, their low crystallinity in thick films hampers practical device applications. In this study, mixtures of nickel and copper ions are employed to fabricate benzenehexathiolato (BHT) -based coordination nanosheet films, and serendipitously, we find that this heterometallicity preferentially forms a structural phase with improved film crystallinity. Spectroscopic and scattering measurements provide evidence for a bilayer structure with in-plane periodic arrangement of copper and nickel ions with the NiCu2 BHT formula. Compared with homometallic films, heterometallic films exhibit more crystalline microstructures with larger and more oriented grains, achieving higher electric conductivities reaching metallic behaviours. Low dependency of Seebeck coefficient on the mixing ratio of nickel and copper ions supports that the large variation in the conductivity data is not caused by change in the intrinsic properties of the films. Our findings open new pathways to improve crystallinity and to tune functional properties of two-dimensional coordination nanosheets. This article is protected by copyright. All rights reserved.
Sponsorship
EPSRC-JSPS core-to-core program (EP/S030662/1, JPJSCCA20190005)
Funder references
The Royal Society (nf121150)
Engineering and Physical Sciences Research Council (EP/P007767/1)
Engineering and Physical Sciences Research Council (EP/S030662/1)
Identifiers
External DOI: https://doi.org/10.1002/adma.202106204
This record's URL: https://www.repository.cam.ac.uk/handle/1810/332765
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