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Free-Standing Nanometer-Thick Covalent Organic Framework Films for Separating CO2 and N-2

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Title: Free-Standing Nanometer-Thick Covalent Organic Framework Films for Separating CO2 and N-2
Authors: Kato, Masaki Browse this author
Ota, Ryo Browse this author
Endo, Takashi Browse this author
Yanase, Takashi Browse this author
Nagahama, Taro Browse this author →KAKEN DB
Shimada, Toshihiro Browse this author →KAKEN DB
Keywords: covalent organic frameworks
free-standing film
vacuum deposition polymerization
high-resolution electron microscopy
CO2 separation membrane
Issue Date: 1-Feb-2022
Publisher: American Chemical Society
Journal Title: ACS Applied Nano Materials
Volume: 5
Issue: 2
Start Page: 2367
End Page: 2374
Publisher DOI: 10.1021/acsanm.1c04048
Abstract: Covalent organic frameworks (COF) have been gathering much attention because the shapes, sizes, and chemical functions of their nanostructured pores can be arbitrarily controlled by designing the organic precursors. We fabricated cm-sized free-standing COF films with the thickness of 50-100 nm by an alternating vacuum deposition polymerization method. Precise adjustment of the stoichiometry by digitally controlled deposition was essential for producing the robust free-standing COF films. High-resolution electron microscopy revealed 3 nm pore structures, which correspond to the atomic structure of the COF. Small angle X-ray diffraction shows the existence of a similar periodicity. The CO2/N-2 gas phase separation properties were evaluated from 10(3)-10(5) Pa, and the parameters for each molecular permeation were determined. Based on the detailed analysis, it was found that the selectivity comes from the greater sorption affinity of CO2 to the COF compared to N-2, which is consistent with the quantum chemical calculation. Since the vapor phase method can be used to coat various shaped templates, our method provides a new option for fabrication of neat COF membranes with various structures and their applications for the separation membrane.
Rights: This document is the Accepted Manuscript version of a Published Work that appeared in final form in ACS Applied Nano Materials, copyright © American Chemical Society after peer review and technical editing by the publisher. To access the final edited and published work see ACS Applied Nano Materials.
Type: article (author version)
Appears in Collections:工学院・工学研究院 (Graduate School of Engineering / Faculty of Engineering) > 雑誌発表論文等 (Peer-reviewed Journal Articles, etc)

Submitter: 島田 敏宏

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