Halide Perovskite glues activate two-dimensional covalent organic framework crystallites for selective NO2 sensing

Wen Ye, Liangdan Zhao, Hong-Zhen Lin, Lifeng Ding, Qiang Cao, Ze-Kun Chen, Jia Wang, Qi-Meng Sun, Jing-Hui He and Jian-Mei Lu ()
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Wen Ye: Soochow University
Liangdan Zhao: Xi’an Jiao Tong-Liverpool University
Hong-Zhen Lin: Chinese Academy of Sciences
Lifeng Ding: Xi’an Jiao Tong-Liverpool University
Qiang Cao: Soochow University
Ze-Kun Chen: Soochow University
Jia Wang: Soochow University
Qi-Meng Sun: Soochow University
Jing-Hui He: Soochow University
Jian-Mei Lu: Soochow University

Nature Communications, 2023, vol. 14, issue 1, 1-9

Abstract: Abstract Two-dimensional covalent organic frameworks (2D COFs) are promising for gas sensing owing to the large surface area, abundant active sites, and their semiconducting nature. However, 2D COFs are usually produced in the form of insoluble micro-crystallites. Their poor contacts between grain boundaries severely suppress the conductivity, which are too low for chemresistive gas sensing. Here, we demonstrate that halide perovskites can be employed as electric glues to bond 2D COF crystallites to improve their conductivity by two orders of magnitude, activating them to detect NO2 with high selectivity and sensitivity. Resonant microcantilever, grand canonical Monte Carlo, density functional theory and sum-frequency generation analyses prove that 2D COFs can enrich and transfer electrons to NO2 molecules, leading to increased device conductivity. This work provides a facile approach for improving the conductivity of polycrystalline 2D COF films and may expand their applications in semiconductor devices, such as sensors, resistors, memristors and field-emission transistors.

Date: 2023
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DOI: 10.1038/s41467-023-37296-0

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