Recent progress in covalent organic framework thin films: fabrications, applications and perspectives.
Han Wang1, Zhuotong Zeng2, Piao Xu1
1College of Environmental Science and Engineering, Hunan University and Key Laboratory of Environmental Biology and Pollution Control (Hunan University), Ministry of Education, Changsha 410082, P. R. China. zgming@hnu.edu.cn.
Chemical Society Reviews
|December 20, 2018
Summary
Covalent organic frameworks (COFs) are promising porous materials, but their insolubility hinders use. This review details fabricating COF thin films and nanosheets for diverse applications like energy storage and sensors.
Area of Science:
- Materials Science
- Nanotechnology
- Chemistry
Background:
- Covalent organic frameworks (COFs) are emerging porous materials with tunable properties.
- The insolubility and poor processability of bulk COF powders limit their practical applications.
- Fabricating COF thin films and nanosheets is crucial for unlocking their potential.
Purpose of the Study:
- To review recent advances in the fabrication of covalent organic framework (COF) thin films and free-standing nanosheets.
- To cover both bottom-up and top-down synthetic strategies for COF thin films.
- To summarize the diverse applications of COF thin films.
Main Methods:
- Bottom-up strategies: solvothermal synthesis, interfacial polymerization, vapor-assisted conversion, continuous flow synthesis.
- Top-down strategies: solvent-assisted exfoliation, self-exfoliation, mechanical delamination, chemical exfoliation.
- Review of literature on COF thin film fabrication and applications.
Main Results:
- Successful fabrication of COF thin films on substrates and as free-standing nanosheets.
- Diverse synthetic routes enable controlled architectures and properties.
- COF thin films show significant potential in energy storage, semiconductor devices, membrane separations, sensors, and drug delivery.
Conclusions:
- COF thin films offer solutions to the processing challenges of bulk COFs.
- Advancements in fabrication techniques are expanding their application scope.
- Further research into synthetic strategies, mechanisms, and applications is warranted.
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