Li Weijin, Yang Guang, Terzis Alexandros, Mukherjee Soumya, He Chao, An Xingtao, Wu Jingyi, Weigand Bernhard, Fischer Roland A
Chair of Inorganic and Metal-Organic Chemistry, Catalysis Research Center, Ernst-Otto-Fischer Straße 1 and Department of Chemistry, Technical University of Munich, Lichtenbergstraße 4, Garching bei München, 85748, Germany.
School of Mechanical Engineering, Shanghai Jiao Tong University, Dongchuan Road 800, Shanghai, 200240, China.
Adv Mater. 2021 Apr;33(14):e2006980. doi: 10.1002/adma.202006980. Epub 2021 Feb 24.
Transient heat generation during guest adsorption and host-guest interactions is a natural phenomenon in metal-organic framework (MOF) chemistry. However, in situ tracking of such MOF released heat is an insufficiently researched field due to the fast heat dissipation to the surroundings. Herein, a facile capillary-driven liquid-imbibition approach is developed for in situ tracking of transient heat release at the wetting front of surface-mounted MOFs (SURMOFs) on cellulosic fiber substrates. Spatiotemporal temperature distributions are obtained with infrared thermal imaging for a range of MOF-based substrates and imbibed liquids. Temperature rises at the wetting front of water and binary mixtures with organic solvents are found to be over 10 K with an ultrafast and distinguishable thermal signal response (<1 s) with a detectable concentration limit ≤1 wt%. As an advancement to the state-of-the-art in trace-solvent detection technologies, this study shows great prospects for the integration of SURMOFs in future sensor devices. Inspired by this prototypal study, SURMOF-based transient heat signal transduction is likely to be extended to an ever-expanding library of SURMOFs and other classes of surface-grafted porous materials, translating into a wide range of convenient, portable, and ubiquitous sensor devices.
客体吸附和主客体相互作用过程中的瞬态热生成是金属有机框架（MOF）化学中的一种自然现象。然而，由于热量快速散失到周围环境中，对这种MOF释放热量的原位跟踪是一个研究不足的领域。在此，开发了一种简便的毛细管驱动液体浸润方法，用于原位跟踪纤维素纤维基材上表面安装的MOF（SURMOF）润湿前沿的瞬态热释放。通过红外热成像获得了一系列基于MOF的基材和浸润液体的时空温度分布。发现水和与有机溶剂的二元混合物在润湿前沿的温度升高超过10 K，具有超快且可区分的热信号响应（<1 s），可检测浓度极限≤1 wt%。作为痕量溶剂检测技术的最新进展，本研究展示了SURMOF在未来传感器设备中集成的巨大前景。受此原型研究的启发，基于SURMOF的瞬态热信号转导可能会扩展到不断扩大的SURMOF库和其他类别的表面接枝多孔材料，转化为各种方便、便携且无处不在的传感器设备。
