Two-Dimensional Band Structure in Honeycomb Metal-Organic Frameworks

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Details

Original languageEnglish
Pages (from-to)5596-5602
Number of pages7
JournalNano Letters
Volume18
Issue number9
Publication statusPublished - 12 Sep 2018
MoE publication typeA1 Journal article-refereed

Researchers

Research units

  • Kanazawa University
  • Graduate School Materials Science in Mainz

Abstract

Two-dimensional (2D) metal-organic frameworks (MOFs) have been recently proposed as a flexible material platform for realizing exotic quantum phases including topological and anomalous quantum Hall insulators. Experimentally, direct synthesis of 2D MOFs has been essentially confined to metal substrates, where the strong interaction with the substrate masks the intrinsic electronic properties of the MOF. In addition to electronic decoupling from the underlying metal support, synthesis on weakly interacting substrates (e.g., graphene) would enable direct realization of heterostructures of 2D MOFs with inorganic 2D materials. Here, we demonstrate synthesis of 2D honeycomb MOFs on epitaxial graphene substrate. Using low-temperature scanning tunneling microscopy (STM) and atomic force microscopy (AFM) complemented by density-functional theory (DFT) calculations, we show the formation of a 2D band structure in the MOF decoupled from the substrate. These results open the experimental path toward MOF-based designer electronic materials with complex, engineered electronic structures.

    Research areas

  • 4,4′-dicyanobiphenyl (DCBP), 9,10-dicyanoanthracene (DCA), cobalt, epitaxial graphene, metal-organic framework (MOF), Scanning tunneling microscopy (STM)

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