Ultralow k covalent organic frameworks enabling high fidelity signal transmission and high temperature electromechanical sensing

Donglin Chen, Juncheng Sha, Xudong Mei, An Ye, Zhengping Zhao, Xunlin Qiu (), Xiaoyun Liu, Yueping Niu, Peiyuan Zuo () and Qixin Zhuang ()
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Donglin Chen: East China University of Science and Technology
Juncheng Sha: East China University of Science and Technology
Xudong Mei: East China University of Science and Technology
An Ye: East China University of Science and Technology
Zhengping Zhao: East China University of Science and Technology
Xunlin Qiu: East China University of Science and Technology
Xiaoyun Liu: East China University of Science and Technology
Yueping Niu: East China University of Science and Technology
Peiyuan Zuo: East China University of Science and Technology
Qixin Zhuang: East China University of Science and Technology

Nature Communications, 2024, vol. 15, issue 1, 1-9

Abstract: Abstract As integrated circuits have developed towards the direction of complexity and miniaturization, there is an urgent need for low dielectric constant materials to effectively realize high-fidelity signal transmission. However, there remains a challenge to achieve ultralow dielectric constant and ultralow dielectric loss over a wide temperature range, not to mention having excellent thermal conductivity and processability concurrently. We herein prepare dual-linker freestanding covalent organic framework films with tailorable fluorine content via interfacial polymerization. The covalent organic framework possesses an ultralow dielectric constant (1.25 at 1 kHz, ≈1.2 at 6 G band), ultralow dielectric loss (0.0015 at 1 kHz) with a thermal conductivity of 0.48 Wm−1K−1. We show high-fidelity signal transmission based on the large-sized (>15 cm2) COF films, far exceeding the most commercially available polyimide-based printed circuit board. In addition, the covalent organic framework also features excellent electret properties, which allows for active high-temperature electromechanical sensing. The electrode nanogenerator maintains 90% of the output voltage at 120 °C, outperforming the traditional fluorinated ethylene propylene electret. Collectively, this work paves the way for scalable application of ultralow dielectric constant covalent organic framework thin films in signal transmission and electromechanical sensing.

Date: 2024
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DOI: 10.1038/s41467-024-55191-0

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