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Peptide-Guided Metal–Organic Frameworks Spatial Assembly Sustain Long-Lived Charge-Separated State to Improve Photocatalytic Performance
ACS Nano ( IF 15.8 ) Pub Date : 2024-09-14 , DOI: 10.1021/acsnano.4c05370 Ping Li 1 , Hao Lian 1, 2 , Yutong Zhang 3 , Li Yi 1 , Jiahui Yao 1 , Penghui Liu 1 , Li-Li Li 1 , Xinfeng Liu 3 , Hao Wang 1
ACS Nano ( IF 15.8 ) Pub Date : 2024-09-14 , DOI: 10.1021/acsnano.4c05370 Ping Li 1 , Hao Lian 1, 2 , Yutong Zhang 3 , Li Yi 1 , Jiahui Yao 1 , Penghui Liu 1 , Li-Li Li 1 , Xinfeng Liu 3 , Hao Wang 1
Affiliation
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The controlled fabrication of spatial architectures using metal–organic framework (MOF)-based particles offers opportunities for enhancing photocatalytic performances. The understanding of the contribution of assembly to a precise photocatalytic mechanism, particularly from the perspective of charge separation and extraction dynamics, still poses challenges. The present report presents a facile approach for the spatial assembly of zinc imidazolate MOF (ZIF-8), guided by β-turn peptides (SAZH). We investigated the dynamics of photoinduced carriers using transient absorption spectroscopy. The presence of a long-lived internal charge-separated state in SAZH confirms its role as an intersystem crossing state. The formation of an assembly interface facilitates efficient electron transfer from SAZH to O2, resulting in approximately 2.6 and 2 times higher concentrations of superoxide (·O2–) and hydrogen peroxide (H2O2), respectively, compared to those achieved with ZIF-8. The medical dressing fabricated from SAZH demonstrated exceptional biocompatibility and exhibited an outstanding performance in promoting wound restoration. It rapidly achieved hemostasis during the bleeding phase, followed by a nearly 100% photocatalytic killing efficiency against the infected site during the subsequent inflammatory phase. Our findings reveal a pivotal dynamic mechanism underlying the photocatalytic activity of control-assembled ZIF-8, providing valuable guidelines for the design of highly efficient MOF photocatalysts.
中文翻译：
肽引导金属有机框架空间组装维持长寿命的电荷分离状态以提高光催化性能
使用基于金属有机框架（MOF）的颗粒控制空间结构的制造为增强光催化性能提供了机会。了解组装对精确光催化机制的贡献，特别是从电荷分离和提取动力学的角度来看，仍然面临挑战。本报告提出了一种在 β-转角肽 (SAZH) 引导下空间组装咪唑酸锌 MOF (ZIF-8) 的简便方法。我们使用瞬态吸收光谱研究了光生载流子的动力学。 SAZH 中存在的长寿命内部电荷分离态证实了其作为系间交叉态的作用。组装界面的形成促进了从 SAZH 到 O 2 的有效电子转移，导致超氧化物 (·O 2 – ) 和过氧化氢 (H 2 O 2 ) 的浓度分别比用 SAZH 实现的浓度高约 2.6 倍和 2 倍。 ZIF-8。由SAZH制成的医用敷料表现出优异的生物相容性，并在促进伤口修复方面表现出优异的性能。它在出血阶段迅速实现止血，随后在随后的炎症阶段对感染部位实现近100%的光催化杀伤效率。我们的研究结果揭示了控制组装 ZIF-8 光催化活性的关键动态机制，为高效 MOF 光催化剂的设计提供了有价值的指导。
更新日期：2024-09-14
中文翻译：
肽引导金属有机框架空间组装维持长寿命的电荷分离状态以提高光催化性能
使用基于金属有机框架（MOF）的颗粒控制空间结构的制造为增强光催化性能提供了机会。了解组装对精确光催化机制的贡献，特别是从电荷分离和提取动力学的角度来看，仍然面临挑战。本报告提出了一种在 β-转角肽 (SAZH) 引导下空间组装咪唑酸锌 MOF (ZIF-8) 的简便方法。我们使用瞬态吸收光谱研究了光生载流子的动力学。 SAZH 中存在的长寿命内部电荷分离态证实了其作为系间交叉态的作用。组装界面的形成促进了从 SAZH 到 O 2 的有效电子转移，导致超氧化物 (·O 2 – ) 和过氧化氢 (H 2 O 2 ) 的浓度分别比用 SAZH 实现的浓度高约 2.6 倍和 2 倍。 ZIF-8。由SAZH制成的医用敷料表现出优异的生物相容性，并在促进伤口修复方面表现出优异的性能。它在出血阶段迅速实现止血，随后在随后的炎症阶段对感染部位实现近100%的光催化杀伤效率。我们的研究结果揭示了控制组装 ZIF-8 光催化活性的关键动态机制，为高效 MOF 光催化剂的设计提供了有价值的指导。
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