Layered 3D Covalent Organic Framework Films Based on Carbon-Carbon Bonds
Yizhou Yang1, Martin Ratsch1, Austin M Evans2
1Department of Chemistry and Molecular Biology, University of Gothenburg, 412 96 Göteborg, Sweden.
Journal of the American Chemical Society
|August 15, 2023
Summary
Researchers developed novel 3D crystalline covalent organic framework (COF) films by epitaxially stacking different COFs. This breakthrough enables multifunctional materials with spatially controlled functionalities for advanced applications.
Area of Science:
- Materials Science
- Nanotechnology
- Supramolecular Chemistry
Background:
- Covalent organic frameworks (COFs) show promise in gas storage, catalysis, drug delivery, and sensing.
- Existing COF synthesis methods typically yield powders with uncontrolled grain sizes.
- Current COFs are chemically homogeneous, limiting tailored functionality distribution.
Purpose of the Study:
- To develop strategies for synthesizing spatially controlled, multifunctional COF films.
- To enable the creation of COF materials with localized and consecutive functions.
- To broaden the synthetic versatility and application potential of COFs.
Main Methods:
- Synthesis of two 3D crystalline COF films (ionic B-based and neutral C-based) with similar unit cell parameters.
- Epitaxial stacking of COF films to create layered 3D structures.
- Real-time monitoring of film growth using quartz crystal microbalance (QCM).
- Characterization using chemical analysis, vibrational spectroscopy, and grazing incidence X-ray diffraction (GIXRD).
Main Results:
- Successful synthesis of layered 3D COF films via epitaxial stacking.
- Demonstrated linear film growth kinetics monitored by QCM.
- Confirmed high degree of polymerization and polycrystalline, anisotropic nature of the films.
- Expanded the concept to create layered films using COF-300 and its iodinated derivative.
Conclusions:
- This work presents a novel method for fabricating multifunctional COF films with controlled spatial distribution of functionalities.
- The developed approach paves the way for creating advanced crystalline materials with embedded concurrent functions.
- This advancement significantly enhances the potential applications of COFs in various scientific and technological fields.
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