Crystal engineering using passivation to reduce perovskite defects is crucial to improving the quality of perovskite crystals and optoelectronic properties. Because of their unique properties, metal–organic framework materials have been used as an emerging and effective passivator for perovskite materials and optoelectronic devices. This paper focuses on the differences in the optoelectronic properties of zeolite imidazolium ester framework materials (ZIF-11 & ZIF-23) doped with different conjugated ring ligands for perovskite photodetectors. This paper proposes a simple and effective method to dope zeolite imidazolium ester framework nanoparticles (ZIF-11 & ZIF-23) into organic–inorganic perovskite MAPbI3 films. The crystalline quality of the perovskite films was improved after doping with ZIF-11 and ZIF-23. Meanwhile, the performance of the planar photoconductive devices was significantly improved. The photoresponsivity of the photodetector doped with ZIF-23 was 0.185A/W, and the detectivity was 4.22 × 1012 Jones. The photoresponsivity of the photodetector doped with ZIF-23 was 0.164 A/W, and the detectivity was 3.27 × 1012 Jones. The devices maintained long-time operational stability, operating without significant degradation for 480 s under the 1.2 V bias voltage operating condition. In addition, we observed a significant suppression of the ion migration process in ZIF-23 for a voltage-controlled ion migration process. The potential application of perovskite and MOF heterojunction materials for image information acquisition and storage is demonstrated.
Fanrong Kong,Wenying Zhou,Fan Zhang,Weiwei Li,Haomiao Li,Yuanwei Zhu,Bin Zhou,Tian Yao,Bo Li
The development of high-performance power electronics is constrained by the lack of polymer dielectrics capable of operating under extreme conditions. Conventional dielectrics face significant challenges at high temperatures and electric fields due to increased leakage currents and dielectric loss. In this work, we introduce zeolitic imidazolate framework (ZIF-11) as a filler for polyetherimide (PEI), showcasing its dual functionality in suppressing both ionic and electronic conduction. The strong electrostatic interactions between ZIF-11 and the PEI matrix reduce free volume, inhibiting ionic species' mobility, while the high electron affinity of ZIF-11 introduces multiple traps for electronic charge carriers, significantly lowering electronic conduction. Leveraging these synergistic effects, the composite achieves an order-of-magnitude reduction in leakage current with ≤1 wt% ZIF-11. It maintains >80% efficiency at 625 MV m−1 and 150 °C, achieving an energy density of 5.44 J cm−3—a 1.38-fold improvement over unfilled PEI and surpassing current dielectric polymers and polymer nanocomposites. This scalable strategy demonstrates the transformative potential of engineering MOF-based fillers in designing advanced polymer dielectrics for next-generation power electronics.
Carbonic anhydrase (CA) enzyme-based absorption processes represent a promising approach to flue gas CO 2 capture owing to their rapid absorption rates and low energy penalties. However, CA enzymes exhibit poor stability and activity under typical flue gas conditions, thus constraining their industrial utilization. Enzyme immobilization has been proposed as a potential means of improving associated stability and activity levels, thus overcoming these limitations. Herein, a variety of zeolitic imidazolate frameworks including ZIF-8, ZIF-11, and ZIF-90 with a range of organic ligands were synthesized as adsorption-based carriers for CA enzyme immobilization. In a series of experiments, CA immobilized on ZIF-8 (CA/ZIF-8) was found to retain higher activity levels that were approximately 86% of those of the free enzyme, as compared to 44% and 16% for CA/ZIF-11 and CA/ZIF-90, respectively. Immobilized CA and associated carrier frameworks were characterized via XRD, SEM, and BET. Variations in CA enzyme secondary structural characteristics in the context of immobilization were monitored via FTIR and CD to explore the molecular basis for variable activity levels associated with different carriers, revealing more hydrophilic materials to be conducive to the preservation of enzymatic activity. In addition, carrier precursor selection should take both hydrophilicity and the potential inhibitory effects of functional groups on the CA enzyme into account.
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