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    Evidence of One-Dimensional Channels in Hydrogen-Bonded Organic Porous Thin Films Fabricated at the Air/Liquid Interface

    Year: 2022

    Journal: Langmuir, Volume 38, FEB 8, page 1910–1914

    Authors: Yamanami, Kanae; Fujita, Yuto; Matsui, Kazuma; Asari, Ryu; Kusawake, Tomoko; Shimizu, Tomoko K.

    Organizations: Inamori Foundation; Takahashi Industrial and Economic Research Foundation; Keio Leading-edge Laboratory of Science and Technology; NIMS microstructural characterization platform as a program of Nanotechnology Platform of the Ministry of Education, Culture, Sports, Science and Technology (MEXT), Japan [JPMXP09A21NM0065, JPMXP09A20NM0085, JPMXP09A19NM0097]

    Visualization of periodically aligned pores in organic frameworks is a key to the understanding of their structural control. Comparing to monolayer-thick self-assembled molecular networks, real-space nanoscale characterization of thicker films, especially obtaining information on the stacking manner of molecules is challenging. Here, we report an atomic force microscopy study of hydrogen-bonded thin films fabricated at the air/liquid interface. The presence of one-dimensional channels is evidenced by resolving honeycomb structures over the films with the thickness variation of more than several nanometers. We also demonstrate that the film thickness can be controlled by the ratio of mixed solvent rather than the surface pressure during the fabrication at the air/liquid interface.
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