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Issue 41, 2018
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Graphene-like metal–organic frameworks: morphology control, optimization of thin film electrical conductivity and fast sensing applications

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Abstract

The metal–organic framework Cu-2,3,6,7,10,11-hexahydroxytriphenylene (Cu3hhtp2-MOF), a copper-based graphene-like framework, is one of the few MOFs featuring inherent electrical conductivity. Here, we investigate the synthesis of this material with regard to the influence of different additives. It is shown that ammonia acts as a modulator leading to platelet-like particles in a water-based synthesis system. This material is thoroughly characterized by X-ray diffraction (XRD), electron microscopy, atomic force microscopy (AFM), physisorption, thermal behaviour, and electrical conductivity. The measured conductivity value of 0.045 S cm−1 surpasses all formerly reported measurements. The obtained platelets appear especially suitable for the preparation of different devices. As an example, we prepared thin and homogenous films by spray-coating water-based dispersions of this MOF on glass and on polymer substrates. In the films, the platelets are oriented parallel to the substrate and are in intimate contact. This leads to a high electrical conductivity combined with an easily accessible pore system. The applicability of such coatings is shown in a preliminary sensing test, showing quick and strong response and fast recovery. This work shows that control of the crystal morphology combined with suitable preparation procedures can enhance the performance of MOF-based devices.

Graphical abstract: Graphene-like metal–organic frameworks: morphology control, optimization of thin film electrical conductivity and fast sensing applications

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Publication details

The article was received on 29 Jul 2018, accepted on 14 Sep 2018 and first published on 25 Sep 2018


Article type: Paper
DOI: 10.1039/C8CE01264D
Citation: CrystEngComm, 2018,20, 6458-6471
  • Open access: Creative Commons BY-NC license
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    Graphene-like metal–organic frameworks: morphology control, optimization of thin film electrical conductivity and fast sensing applications

    B. Hoppe, K. D. J. Hindricks, D. P. Warwas, H. A. Schulze, A. Mohmeyer, T. J. Pinkvos, S. Zailskas, M. R. Krey, C. Belke, S. König, M. Fröba, R. J. Haug and P. Behrens, CrystEngComm, 2018, 20, 6458
    DOI: 10.1039/C8CE01264D

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