Two-dimensional covalent organic framework films prepared on various substrates through vapor induced conversion

Minghui Liu, Youxing Liu, Jichen Dong, Yichao Bai, Wenqiang Gao, Shengcong Shang, Xinyu Wang, Junhua Kuang, Changsheng Du, Ye Zou, Jianyi Chen () and Yunqi Liu ()
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Minghui Liu: Chinese Academy of Sciences
Youxing Liu: Chinese Academy of Sciences
Jichen Dong: Chinese Academy of Sciences
Yichao Bai: Chinese Academy of Sciences
Wenqiang Gao: Chinese Academy of Sciences
Shengcong Shang: Chinese Academy of Sciences
Xinyu Wang: Chinese Academy of Sciences
Junhua Kuang: Chinese Academy of Sciences
Changsheng Du: Chinese Academy of Sciences
Ye Zou: Chinese Academy of Sciences
Jianyi Chen: Chinese Academy of Sciences
Yunqi Liu: Chinese Academy of Sciences

Nature Communications, 2022, vol. 13, issue 1, 1-9

Abstract: Abstract Covalent organic frameworks (COFs) can exhibit high specific surface area and catalytic activity, but traditional solution-based synthesis methods often lead to insoluble and infusible powders or fragile films on solution surface. Herein we report large-area –C=N– linked two-dimensional (2D) COF films with controllable thicknesses via vapor induced conversion in a chemical vapor deposition (CVD) system. The assembly process is achieved by reversible Schiff base polycondensation between PyTTA film and TPA vapor, which results in a uniform organic framework film directly on growth substrate, and is driven by π‐π stacking interactions with the aid of water and acetic acid. Wafer-scale 2D COF films with different structures have been successfully synthesized by adjusting their building blocks, suggesting its generic applicability. The carrier mobility of PyTTA-TPA COF films can reach 1.89 × 10−3 cm2 V−1 s−1. When employed as catalysts in hydrogen evolution reaction (HER), they show high electrocatalytic activity compared with metal-free COFs or even some metallic catalysts. Our results represent a versatile route for the direct construction of large-area uniform 2D COF films on substrates towards multi-functional applications of 2D π‐conjugated systems.

Date: 2022
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DOI: 10.1038/s41467-022-29050-9

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