Core-shell Ag@C spheres derived from Ag-MOFs with tunable ligand exchanging phase inversion for electromagnetic wave absorption.
Core-shell Ag@C spheres derived from Ag-MOFs with tunable ligand exchanging phase inversion for electromagnetic wave absorption.
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DOI：
10.1016/j.jcis.2022.04.012
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发表时间：
2022-04
影响因子：
9.9
通讯作者：
Yihe Song;Xuehua Liu;Zhenguo Gao;Zhengdong Wang;Yinghui Hu;Kai Yang;Zehao Zhao;Di Lan;
中科院分区：
文献类型：
--
作者：
Yihe Song;Xuehua Liu;Zhenguo Gao;Zhengdong Wang;Yinghui Hu;Kai Yang;Zehao Zhao;Di Lan;
通过可控的连续相转化从金属有机框架（MOF）中获得结构可调的电磁波吸收材料（EMA）已变得非常重要。在此，通过可调相转化成功地由 Ag-MOF 制备了一系列核壳 Ag@C EMA。用2-甲基咪唑（Hmim）不断取代对苯二甲酸（H2BDC）导致Ag-MOF-5结构逐渐转变为ZIF-L，这决定了Ag@C EMA的晶体和形态结构。此外，由于弛豫损耗的优化，S2的最小反射损耗（RLmin）在厚度为3.0 mm时达到-50.14 dB。源自原始 Ag-MOF 的 EMA 具有最宽的吸收带宽 (fE)，分别为 5.44 GHz 和 RLminof -47.36 dB，仅为 2.2 mm。这项工作可以为反相 MOF 衍生的核壳 EMA 提供新的思路，并为设计新型高性能 EMA 提供指导。
It has become greatly significant to achieve structurally tunable electromagnetic wave absorption materials (EMAs) derived from metal-organic frameworks (MOFs) via controllably continuous phase inversion. Herein, a series of core–shell Ag@C EMAs were successfully fabricated from Ag-MOFs via adjustable phase inversion. Replacing terephthalic acid (H2BDC) with 2-methylimidazole (Hmim) continuously led to the gradual transformation of Ag-MOF-5 structure into ZIF-L, which determined the crystal and morphological structure of Ag@C EMAs. In addition, due to the optimization of relaxation loss, the minimum reflection loss (RLmin) of S2 reached −50.14 dB with a thickness of 3.0 mm. The EMA derived from the original Ag-MOF had the widest absorption bandwidth (fE) of 5.44 GHz and RLminof −47.36 dB at only 2.2 mm, respectively. This work can shed new light on the core–shell EMAs derived from phase inversion MOFs, and provide guidance to design novel high-performance EMAs.