Confined polymerization strategy to construct polypyrrole/zeolitic imidazolate frameworks (PPy/ZIFs) nanocomposites for tunable electrical conductivity and excellent electromagnetic absorption
Confined polymerization strategy to construct polypyrrole/zeolitic imidazolate frameworks (PPy/ZIFs) nanocomposites for tunable electrical conductivity and excellent electromagnetic absorption
复制标题
受限聚合策略构建聚吡咯/沸石咪唑酯骨架（PPy/ZIF）纳米复合材料，具有可调的电导率和优异的电磁吸收
DOI：
10.1016/j.compscitech.2019.03.003
复制
发表时间：
2019-04-12
影响因子：
9.1
通讯作者：
Zhu, Xufei
中科院分区：
文献类型：
--
作者：
Jiao, Yingzhi;Li, Junjian;Zhu, Xufei
导电多孔金属有机框架（MOF）在广泛的应用中表现出巨大的潜力。然而，如何赋予MOF适当的导电性仍然是一个挑战。在本文中，我们报道了聚吡咯（PPy）纳米纤维在 MOF 纳米通道中的可控生长，以构建一种纳米复合材料。我们还可以使用这种策略直接展示 MOF 中的直纳米通道结构。更重要的是，形成的 PPy/ZIFs 纳米复合材料显示出高度可调的电导率以及可调的电磁吸收（EMA）特性。吸收高于 90% 的入射电磁波的最大频率宽度达到 7.24 GHz，比大多数报道的 MOF 或基于导电聚合物的 EMA 材料更宽。使用电导损耗和界面极化弛豫来研究这些 PPy/ZIFs 纳米复合材料的电磁耗散机制。它开辟了导电 MOF 的合理设计，以实现优异的电磁吸收。
Electrically conductive porous metal-organic frameworks (MOFs) exhibit a huge potential in a broad range of applications. However, how to endow MOFs with appropriate electrical conductivity remains a challenge. In this paper, we report a controllable growth of polypyrrole (PPy) nanofibers in the nanochannels of MOFs to construct a kind of nanocomposites. We can also use this strategy to directly demonstrate the straight nanochannel structure in MOFs. More importantly, the formed PPy/ZIFs nanocomposites show a highly tunable electrical conductivity as well as a tunable electromagnetic absorption (EMA) property. The maximal frequency width with absorbing higher than 90% of incident electromagnetic waves reaches 7.24 GHz, which is wider than those of most reported MOFs or conducting polymers based EMA materials. An electrical conductance loss and interfacial polarization relaxation are used to investigate the electromagnetic dissipation mechanism of theses PPy/ZIFs nanocomposites. It opens up the rational design of electrically conductive MOFs for excellent electromagnetic absorption.