Hokkaido University Collection of Scholarly and Academic Papers >
Graduate School of Engineering / Faculty of Engineering >
Peer-reviewed Journal Articles, etc >
Free-Standing Nanometer-Thick Covalent Organic Framework Films for Separating CO2 and N-2
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) |
URI: | http://hdl.handle.net/2115/87812 |
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
|