Wang Sa, Fu Yu, Wang Fengdong, Wang Xiyuan, Yang Yi, Wang Mengjin, Wang Jian, Lin En, Ma Heping, Chen Yao, Cheng Peng, Zhang Zhenjie
College of Chemistry, State Key Laboratory of Medicinal Chemical Biology, Nankai University, Tianjin 300071, China.
Key Laboratory of Advanced Energy Materials Chemistry, Ministry of Education, Nankai University, Tianjin 300071, China.
J Am Chem Soc. 2024 Dec 11;146(49):33509-33517. doi: 10.1021/jacs.4c10879. Epub 2024 Nov 27.
The development of highly efficient sensors for low-concentration SO at room temperature is important for human health and fine chemistry, but it still faces critical challenges. Herein, a scalable olefin-linked covalent organic framework (COF) with an ultramicroporous structure and abundant binding sites is first developed as the SO sensing material. The COF can adsorb SO of 220 cm/g at 1 bar and 40 cm/g at 0.01 bar and 298 K, surpassing all reported COFs. The computational and kinetic adsorption studies deeply unveil the selective adsorption mechanism for low-concentration SO. Furthermore, the multicomponent gas mixture breakthrough experiments confirm that the COF can specifically capture low-concentration (2000 ppm) SO. We innovated a melt polymerization technology to fabricate COF films with adjustable substrates and film thicknesses. COF films are directly grown on the interdigital electrodes to prepare the SO sensor device, which possesses a low detection limit (86 ppb) and excellent selectivity for SO in the presence of 10 other potentially interfering gases. Compared to other reported SO sensors, its overall performance is among the top. Prominently, the sensor maintains a stable output signal for more than two months, and recovery can be easily achieved by simply purifying nitrogen at room temperature without heating. This study marks the first use of COFs for SO sensing, opening new possibilities for COFs in the detection of low-concentration toxic gases and manufacturing gas sensor devices.
开发用于室温下低浓度SO的高效传感器对人类健康和精细化学至关重要，但仍面临严峻挑战。在此，首次开发了一种具有超微孔结构和丰富结合位点的可扩展烯烃连接共价有机框架（COF）作为SO传感材料。该COF在1 bar和298 K下可吸附220 cm/g的SO，在0.01 bar和298 K下可吸附40 cm/g的SO，超过了所有已报道的COF。计算和动力学吸附研究深入揭示了低浓度SO的选择性吸附机制。此外，多组分气体混合物突破实验证实，该COF可以特异性捕获低浓度（2000 ppm）的SO。我们创新了一种熔融聚合技术来制备具有可调节基底和膜厚度的COF薄膜。将COF薄膜直接生长在叉指电极上以制备SO传感器装置，该装置具有低检测限（86 ppb），并且在存在10种其他潜在干扰气体的情况下对SO具有优异的选择性。与其他已报道的SO传感器相比，其整体性能位居前列。突出的是，该传感器可保持稳定的输出信号两个多月，并且通过在室温下简单地用氮气净化而无需加热即可轻松实现恢复。这项研究标志着首次将COF用于SO传感，为COF在检测低浓度有毒气体和制造气体传感器装置方面开辟了新的可能性。
