Delen Guusje, Monai Matteo, Meirer Florian, Weckhuysen Bert M
Inorganic Chemistry and Catalysis group, Debye Institute for Nanomaterials Science, Utrecht University, Universiteitsweg 99, 3584, CG, Utrecht, The Netherlands.
Angew Chem Int Ed Engl. 2021 Jan 18;60(3):1620-1624. doi: 10.1002/anie.202011564. Epub 2020 Nov 23.
Despite technological advancements, probing gas-solid interfaces at the nanoscale is still a formidable challenge. New nano-spectroscopic methods are needed to understand the guest-host interactions of functional materials during gas sorption, separation, and conversion. Herein, we introduce in situ Photoinduced Force Microscopy (PiFM) to evidence site-specific interaction between Metal-Organic Frameworks (MOFs) and water. To this end, we developed amphiphilic Surface-anchored MOF (SURMOF) model systems using self-assembly for the side-by-side hetero-growth of nanodomains of hydrophilic HKUST-1 and hydrophobic ZIF-8. PiFM was used to probe local uptake kinetics and to show D O sorption isotherms on (defective) HKUST-1 paddlewheels. By monitoring defect vibrations, we visualized in real-time the saturation of existing defects and the creation of D O-induced defects. This work shows the potential of in situ PiFM to unravel gas sorption mechanisms and map active sites on functional (MOF) materials.
尽管技术不断进步，但在纳米尺度上探测气固界面仍然是一项艰巨的挑战。需要新的纳米光谱方法来理解功能材料在气体吸附、分离和转化过程中的客体-主体相互作用。在此，我们引入原位光致力显微镜（PiFM）来证明金属有机框架（MOF）与水之间的位点特异性相互作用。为此，我们利用自组装开发了两亲性表面锚定MOF（SURMOF）模型系统，用于亲水性HKUST-1和疏水性ZIF-8纳米域的并排异质生长。PiFM用于探测局部吸附动力学，并展示（有缺陷的）HKUST-1桨轮上的D₂O吸附等温线。通过监测缺陷振动，我们实时可视化了现有缺陷的饱和以及D₂O诱导缺陷的产生。这项工作展示了原位PiFM在揭示气体吸附机制和绘制功能（MOF）材料上的活性位点方面的潜力。
