Khandelwal Gaurav, John Dina Anna, Vivekananthan Venkateswaran, Gadegaard Nikolaj, Mulvihill Daniel M, Kim Sang-Jae
James Watt School of Engineering, University of Glasgow, Glasgow, G12 8QQ, UK.
Center for Flexible Electronics, Department of Electronics and Communication Engineering, Koneru Lakshmaiah Education Foundation, Vijayawada Campus, India.
Nanoscale. 2025 Feb 6;17(6):3211-3220. doi: 10.1039/d4nr03909b.
Metal-organic frameworks (MOFs) are porous crystalline materials with a metal ion coordinated to a ligand molecule. Recently, MOFs are being explored extensively for energy harvesting triboelectrification. However, the majority of MOFs are brittle and hard to grow, thus leading to poor device stability and flexibility. Herein, the growth of ZIF-67 MOF is achieved on a cellulosic filter paper (CFP) and cotton fabric (CF) separately to use as the active layer in a TENG. The grown ZIF-67 MOFs were used for the fabrication of CFP-TENG and CF-TENG in vertical contact separation mode. The CF-TENG device exhibited a high durability with no significant change in the electrical output for a period of 14 000 s. Additionally, the device generated a maximum electrical output of 60 V and 3 μA with an output power density of 5 mW m at a load resistance of 800 MΩ. The robustness of the MOF grown on cotton fabric was demonstrated by fabricating a contact separation and rotating TENG device. The rotating TENG device produced an output voltage of ∼100 V and current of 3.5 μA, thus confirming the strong adherence of MOFs on the fabric. The CF-TENG was demonstrated for powering electronics flexible circuits and for biomechanical energy harvesting by utilising finger tapping, hand tapping, jogging and running movements.
金属有机框架材料（MOFs）是一种多孔晶体材料，其中金属离子与配体分子配位。最近，人们广泛探索MOFs用于能量收集摩擦起电。然而，大多数MOFs易碎且难以生长，从而导致器件稳定性和柔韧性较差。在此，分别在纤维素滤纸（CFP）和棉织物（CF）上实现了ZIF-67 MOF的生长，以用作摩擦电纳米发电机（TENG）中的活性层。生长的ZIF-67 MOFs用于以垂直接触分离模式制造CFP-TENG和CF-TENG。CF-TENG器件表现出高耐久性，在14000秒的时间内电输出没有显著变化。此外，该器件在800 MΩ的负载电阻下产生了60 V的最大电输出和3 μA的电流，输出功率密度为5 mW m。通过制造接触分离和旋转TENG器件，证明了生长在棉织物上的MOF的坚固性。旋转TENG器件产生了约100 V的输出电压和3.5 μA的电流，从而证实了MOF在织物上的牢固附着。通过利用手指轻敲、手部轻敲、慢跑和跑步运动，展示了CF-TENG为电子设备、柔性电路供电以及用于生物机械能收集的能力。
