Two-dimensional covalent organic framework films prepared on various substrates through vapor induced conversion
Minghui Liu1,2, Youxing Liu1,2, Jichen Dong1,2
1Beijing National Laboratory for Molecular Sciences, Key Laboratory of Organic Solids, Institute of Chemistry, Chinese Academy of Sciences, 100190, Beijing, PR China.
Nature Communications
|March 18, 2022
Summary
Large-area 2D covalent organic framework (COF) films were synthesized using chemical vapor deposition. These COF films demonstrate high catalytic activity for hydrogen evolution reactions.
Area of Science:
- Materials Science
- Nanotechnology
- Catalysis
Background:
- Traditional synthesis of covalent organic frameworks (COFs) yields insoluble powders or fragile films.
- Existing methods limit the scalability and application of COFs.
Purpose of the Study:
- To develop a scalable method for synthesizing large-area, uniform 2D COF films.
- To explore the catalytic applications of these novel COF films.
Main Methods:
- Vapor-induced conversion in a chemical vapor deposition (CVD) system.
- Reversible Schiff base polycondensation between PyTTA film and TPA vapor.
- Utilizing π-π stacking interactions, water, and acetic acid for film assembly.
Main Results:
- Successfully synthesized wafer-scale 2D COF films with controllable thicknesses.
- Achieved a carrier mobility of 1.89 × 10⁻³ cm² V⁻¹ s⁻¹ in PyTTA-TPA COF films.
- Demonstrated high electrocatalytic activity in hydrogen evolution reactions (HER).
Conclusions:
- The CVD method provides a versatile route for fabricating large-area 2D COF films.
- These COF films show promise as efficient, metal-free catalysts for HER.
- The developed technique enables diverse applications for 2D π-conjugated systems.
