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Processable UiO-66 Metal–Organic Framework Fluid Gel and Electrical Conductivity of Its Nanofilm with Sub-100 nm Thickness

  • Vetiga Somjit
    Vetiga Somjit
    Department of Materials Science and Engineering, School of Molecular Science and Engineering, Vidyasirimedhi Institute of Science and Technology, Rayong 21210, Thailand
  • Phakawan Thinsoongnoen
    Phakawan Thinsoongnoen
    Department of Materials Science and Engineering, School of Molecular Science and Engineering, Vidyasirimedhi Institute of Science and Technology, Rayong 21210, Thailand
  • Saran Waiprasoet
    Saran Waiprasoet
    Department of Materials Science and Engineering, School of Molecular Science and Engineering, Vidyasirimedhi Institute of Science and Technology, Rayong 21210, Thailand
  • Taweesak Pila
    Taweesak Pila
    Department of Materials Science and Engineering, School of Molecular Science and Engineering, Vidyasirimedhi Institute of Science and Technology, Rayong 21210, Thailand
  • Pichaya Pattanasattayavong
    Pichaya Pattanasattayavong
    Department of Materials Science and Engineering, School of Molecular Science and Engineering, Vidyasirimedhi Institute of Science and Technology, Rayong 21210, Thailand
    Research Network of NANOTEC-VISTEC on Nanotechnology for Energy, Vidyasirimedhi Institute of Science and Technology, Rayong 21210, Thailand
  • Satoshi Horike
    Satoshi Horike
    Department of Materials Science and Engineering, School of Molecular Science and Engineering, Vidyasirimedhi Institute of Science and Technology, Rayong 21210, Thailand
    Institute for Integrated Cell-Material Sciences (iCeMS), Institute for Advanced Study, Kyoto University, Kyoto 606-8510, Japan
  • , and 
  • Kanokwan Kongpatpanich*
    Kanokwan Kongpatpanich
    Department of Materials Science and Engineering, School of Molecular Science and Engineering, Vidyasirimedhi Institute of Science and Technology, Rayong 21210, Thailand
    Research Network of NANOTEC-VISTEC on Nanotechnology for Energy, Vidyasirimedhi Institute of Science and Technology, Rayong 21210, Thailand
    *Email: [email protected]
Cite this: ACS Appl. Mater. Interfaces 2021, 13, 26, 30844–30852
Publication Date (Web):June 24, 2021
https://doi.org/10.1021/acsami.1c07262
Copyright © 2021 American Chemical Society
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Abstract

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Zr-based UiO-66 metal–organic framework (MOF) is one of the most studied MOFs with a wide range of potential applications. While UiO-66 is typically synthesized as a microcrystalline solid, we employ a particle downsizing strategy to synthesize UiO-66 as fluid gel with unique rheological properties, which allows the solution-based processing as sub-100 nm films and enhances the electrical conductivity of its pristine structure. Film thicknesses ranging from 40 to 150 nm could be achieved by controlling the spin-coating parameters. The generality of the method is also demonstrated for other Zr-based MOFs including MOF-801 and MOF-808. The impact of particle size and film thickness at the nanoscale on electrical properties of UiO-66 is shown to realize new features that are distinct from those of the bulk powder phase. An electrical insulator UiO-66 shows a significant increase in the electrical conductivity (10–5 S cm–1 compared to 10–7 S cm–1 in the bulk powder phase) when the 10 nm particles are distributed on the substrate with a thickness less than 100 nm. The findings establish a new route for processing of MOF materials as thin films with fine-tuned thickness and offer a new perspective for transport properties of Zr-based MOFs without structural modification.

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The Supporting Information is available free of charge at https://pubs.acs.org/doi/10.1021/acsami.1c07262.

  • Equations of the Arrhenius plot and Randles–Sevcik equation and additional characterization results including water and N2 adsorption isotherm with NLDFT plots, rheological measurement of nonflowing gel, cross-sectional SEM and GIXRD patterns of all fabricated films, setup for electrical measurements and table results, and comparison of conductivity with other works (PDF)

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