Bedi Swati, Bharti Kamini, Banerjee Debamalya, Biradha Kumar
Department of Chemistry, Indian Institute of Technology Kharagpur, Kharagpur, West Bengal, 721302, India.
Department of Physics, Indian Institute of Technology Kharagpur, Kharagpur, West Bengal, 721302, India.
Small. 2024 Dec;20(49):e2406701. doi: 10.1002/smll.202406701. Epub 2024 Sep 23.
The development of electrically conductive membranes is essential for advancing future technologies like electronic devices, supercapacitors, and batteries. Newly synthesized doubly interpenetrated 3D-Cd-MOF (Metal-Organic-Framework) containing angular tetra-carboxylate is found to display very poor electrical conductivity (10 S cm). However, it exhibits an exceptional ability to adsorb I (I@Cd-MOF) which shows increased electrical conductivity of the order of 10 S cm. Following these results, the Cd-MOF is integrated into the PVDF-PVP (Polyvinylidene fluoride-Polyvinylpyrrolidone) polymeric mixed matrix membrane (MMM) and explores their I adsorption capabilities and electrical conductivities before and after I adsorption. Four polymeric MMMs with the loading of Cd-MOF 0, 20, 40, and 50% are tested for their I adsorption ability and their respective electrical conductivities. The 50% Cd-MOF-loaded MMM is found to exhibit higher adsorption of I (685 mg g) and significant enhancement in conductivity from 10 to 10 S cm. The raise in the electrical conductivity by 10 million times is attributed to the synergistic interactions between I, Cd-MOF, PVDF, and PVP polymers as well as the increase in the concentration of charge carriers (holes) within the frameworks. This work serves as blueprint for controlling charge transfer in MMM to tune their electrical conductivity which opens a large window for advanced device applications.
导电膜的发展对于推动诸如电子设备、超级电容器和电池等未来技术至关重要。新合成的含有角状四羧酸盐的双互穿3D-Cd-MOF（金属有机框架）显示出非常低的电导率（10 S/cm）。然而，它表现出非凡的吸附碘的能力（I@Cd-MOF），其电导率增加到10 S/cm量级。基于这些结果，将Cd-MOF整合到PVDF-PVP（聚偏二氟乙烯-聚乙烯吡咯烷酮）聚合物混合基质膜（MMM）中，并探究其在吸附碘之前和之后的碘吸附能力和电导率。测试了四种Cd-MOF负载量分别为0%、20%、40%和50%的聚合物MMM的碘吸附能力及其各自的电导率。发现负载50% Cd-MOF的MMM对碘的吸附量更高（685 mg/g），并且电导率从10 S/cm显著提高到10 S/cm。电导率提高1000万倍归因于碘、Cd-MOF、PVDF和PVP聚合物之间的协同相互作用以及框架内电荷载流子（空穴）浓度的增加。这项工作为控制MMM中的电荷转移以调节其电导率提供了蓝图，这为先进器件应用打开了一扇广阔的窗口。
