Hollow Polypyrrole Nanofiber-Based Self-Assembled Aerogel: Large-Scale Fabrication and Outstanding Performance in Electromagnetic Pollution Management,Industrial & Engineering Chemistry Research

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Hollow Polypyrrole Nanofiber-Based Self-Assembled Aerogel: Large-Scale Fabrication and Outstanding Performance in Electromagnetic Pollution Management
Industrial & Engineering Chemistry Research ( IF 3.8 ) Pub Date : 2020-03-19 , DOI: 10.1021/acs.iecr.0c00386
Chang Xu ₁ , Fan Wu _{1,

2,

3} , Aming Xie ₂ , Liqun Duan ₁ , Zhiqian Yang ₁ , Yilu Xia ₁ , Mengxiao Sun _{2,

3} , Ziming Xiong ₁

Affiliation

Developing materials with large-scale, ultralight, tunable dielectric properties to meet the applications in electromagnetic (EM) pollution management is still a long-standing issue. In this study, a kind of polypyrrole (PPy) aerogel is fabricated on a large scale through the self-assembly of hollow PPy nanofibers. Benefitting from the first reported “seeding” route method, the diameters and dielectric properties of the PPy nanofibers can be controlled by modulating the proportion of hollow PPy nanofiber seeds and pyrrole (Py). By optimizing the component proportion, the hollow PPy nanofiber aerogel can be applied in both microwave absorption and electromagnetic interference (EMI) shielding. It was found that a minimum reflection loss value of −58.73 dB and a wide effective absorption bandwidth of 7.28 GHz were obtained for the seeds and Py proportion of 1:0.5. Moreover, by modulating the proportion to 1:2, the EMI shielding effectiveness of a composite loaded with 20 wt % of hollow PPy nanofiber aerogels can reach 68.92 dB under the thickness of 3.0 mm. A well-defined conductive network of PPy nanofibers and various interface polarizations and multireflections between different PPy nanofibers and hollow pipes may be the main reasons for the excellent performance in EM applications. This work provides a new strategy of hollow PPy nanofiber aerogels for EM protection.

中文翻译：

中空的基于聚吡咯纳米纤维的自组装气凝胶：大规模制造和电磁污染管理中的杰出性能

开发具有大规模，超轻，可调介电性能的材料以满足电磁（EM）污染管理中的应用仍然是一个长期存在的问题。本研究通过中空PPy纳米纤维的自组装，大规模制备了一种聚吡咯（PPy）气凝胶。得益于第一个报道的“播种”路线方法，可以通过调节空心PPy纳米纤维种子和吡咯（Py）的比例来控制PPy纳米纤维的直径和介电性能。通过优化组分比例，中空PPy纳米纤维气凝胶可应用于微波吸收和电磁干扰（EMI）屏蔽。发现最小反射损耗值为-58.73 dB，宽有效吸收带宽为7。种子获得28 GHz，Py比例为1：0.5。此外，通过将比例调整为1：2，负载了20 wt％的中空PPy纳米纤维气凝胶的复合材料在3.0 mm的厚度下的EMI屏蔽效果可以达到68.92 dB。PPy纳米纤维的良好定义的导电网络以及不同PPy纳米纤维与中空管之间的各种界面极化和多重反射可能是在EM应用中具有出色性能的主要原因。这项工作提供了一种中空PPy纳米纤维气凝胶用于EM保护的新策略。PPy纳米纤维的良好定义的导电网络以及不同PPy纳米纤维与中空管之间的各种界面极化和多重反射可能是在EM应用中具有出色性能的主要原因。这项工作提供了中空PPy纳米纤维气凝胶用于EM保护的新策略。PPy纳米纤维的良好定义的导电网络以及不同PPy纳米纤维与中空管之间的各种界面极化和多重反射可能是在EM应用中具有出色性能的主要原因。这项工作提供了一种中空PPy纳米纤维气凝胶用于EM保护的新策略。

更新日期：2020-04-24

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