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Updated: May 25, 2026

A Technical Guide for Performing Spectroscopic Measurements on Metal-Organic Frameworks
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Probing Local Structural Variations in Metal-Organic Framework Thin Films Using Nano-FTIR.

Yukihiro Matsumoto1, Kento Takenaka1, Hiromasa Sato2

  • 1Department of Applied Physics and Physico-Informatics, Faculty of Science and Technology, Keio University, 3-14-1 Hiyoshi, Kohoku-ku, Yokohama, Kanagawa 223-8522, Japan.

Langmuir : the ACS Journal of Surfaces and Colloids
|May 23, 2026
PubMed
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This summary is machine-generated.

This study used advanced microscopy to analyze metal-organic framework (MOF) thin films, revealing crucial details about their structure and coordination bonding at the nanoscale. Understanding these local characteristics is key for developing MOF-based devices.

Area of Science:

  • Materials Science
  • Nanotechnology
  • Chemistry

Background:

  • Precise control over coordination structures and orientation in metal-organic framework (MOF) thin films is essential for their integration into functional devices.
  • Existing macroscopic characterization methods often obscure critical nanoscale structural details and inhomogeneities within MOF thin films.

Purpose of the Study:

  • To definitively characterize local coordination bonding in a representative MOF thin film, NAFS-1, fabricated at the air/liquid interface.
  • To investigate the impact of fabrication steps, such as water-rinsing, on the structural inhomogeneity and coordination bonding of MOF thin films.

Main Methods:

  • Combined atomic force microscopy (AFM) with nano-Fourier transform infrared spectroscopy (nano-FTIR) for nanoscale characterization.

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  • Fabrication of NAFS-1 MOF thin films at the air/liquid interface.

    • Main Results:

    • Nanoscale analysis revealed structural inhomogeneities in NAFS-1 thin films that are typically obscured by macroscopic measurements.
    • Identified characteristic regions within NAFS-1, including areas with uncoordinated carboxyl groups and features exhibiting effective coordination.
    • Omitting the water-rinsing step increased structural inhomogeneity but promoted coordination bonding on average.

    Conclusions:

    • Local characterization is crucial for understanding the crystallinity and uniformity of MOF thin films.
    • The findings provide critical insights into the MOF thin-film formation mechanism at the air/liquid interface.
    • This work emphasizes the importance of optimizing fabrication processes for controlled MOF thin-film properties.