Laboratory, Department of Chemistry, Dartmouth College, Hanover, NH, 03755, USA.
Angew Chem Int Ed Engl. 2022 Feb 1;61(6):e202113665. doi: 10.1002/anie.202113665. Epub 2021 Dec 22.
This paper describes the demonstration of a series of heterobimetallic, isoreticular 2D conductive metal-organic frameworks (MOFs) with metallophthalocyanine (MPc, M=Co and Ni) units interconnected by Cu nodes towards low-power chemiresistive sensing of ppm levels of carbon monoxide (CO). Devices achieve a sub-part-per-million (ppm) limit of detection (LOD) of 0.53 ppm toward CO at a low driving voltage of 0.1 V. MPc-based Cu-linked MOFs can continuously detect CO at 50 ppm, the permissible exposure limit required by the Occupational Safety and Health Administration (OSHA), for multiple exposures, and realize CO detection in air and in humid environment. Diffuse reflectance infrared Fourier transform spectroscopy (DRIFTS), density functional theory (DFT) calculations, and comparison experiments suggest the contribution of Cu nodes to CO binding and the essential role of MPc units in tuning and amplifying the sensing response.
本文展示了一系列异双金属、同构的二维导电金属有机骨架（MOFs），其由金属酞菁（MPc，M=Co 和 Ni）单元通过 Cu 节点连接，可用于对 ppm 级别的一氧化碳（CO）进行低功率的化学电阻式传感。这些器件在 0.1 V 的低驱动电压下对 CO 达到了亚 ppm 级别的检测限（LOD），为 0.53 ppm。基于 MPc 的 Cu 连接 MOFs 可以在多个暴露下连续检测 50 ppm 的 CO，这是职业安全与健康管理局（OSHA）要求的允许暴露限值，并且可以在空气和潮湿环境中实现 CO 检测。漫反射红外傅里叶变换光谱（DRIFTS）、密度泛函理论（DFT）计算和对比实验表明，Cu 节点对 CO 结合的贡献以及 MPc 单元在调节和放大传感响应方面的重要作用。
