Porous CoNi nanoalloy@N-doped carbon nanotube composite clusters with ultra-strong microwave absorption at a low filler loading,Journal of Materials Chemistry C

当前位置： X-MOL 学术 › J. Mater. Chem. C › 论文详情

Our official English website, www.x-mol.net, welcomes your feedback! (Note: you will need to create a separate account there.)

Porous CoNi nanoalloy@N-doped carbon nanotube composite clusters with ultra-strong microwave absorption at a low filler loading
Journal of Materials Chemistry C ( IF 5.7 ) Pub Date : 2020-09-03 , DOI: 10.1039/d0tc03377d
Jin-Bo Cheng _{1,

2,

3} , Wen-Jie Yuan _{1,

2,

3} , Ai-Ning Zhang _{1,

2,

3} , Hai-Bo Zhao _{1,

2,

3} , Yu-Zhong Wang _{1,

2,

3}

Affiliation

Microwave absorption materials with ultra-strong absorption ability at low filler loadings are urgently needed but remain a huge challenge. Herein, porous N-doped carbon nanotube (NCNT) clusters encapsulated with CoNi nanoalloys (50–200 nm) have been fabricated via a facile coordination and carbonization process without toxic solvents and complex conditions. This special composite cluster exhibited a hierarchical microstructure (including 0D CoNi nanoparticles, 1D N-doped carbon nanotubes, and 3D porous networks), high surface areas (143.5–205.8 m² g⁻¹), and excellent thermal oxidation stabilities (≥350 °C). Benefitting from these features, the optimized CoNi@NCNT composite exhibited ultra-strong MA performances with a minimum RL value of up to −64.5 dB (absorbing 99.9999% microwaves) at a low filler loading of 10 wt%, which is much superior to previous ones. The microwave absorption mechanism investigation revealed that the moderate dielectric loss and weak magnetic loss accompanied by a porous structure in the composite clusters together contributed to improving the impedance matching and microwave attenuation ability. This work may pave the way for fabricating low-cost lightweight materials with ultra-strong microwave absorption at low filler loadings.

中文翻译：

多孔CoNi纳米合金@N掺杂的碳纳米管复合材料团簇，在低填充量下具有超强的微波吸收能力

迫切需要在低填充量下具有超强吸收能力的微波吸收材料，但仍然是巨大的挑战。在此，封装有的CoNi纳米合金（50-200纳米）多孔n掺杂碳纳米管（NCNT）簇已经制造通过一个浅显的协调和碳化过程中无毒性溶剂和复杂条件。这种特殊的复合材料团簇具有分层的微观结构（包括0D CoNi纳米颗粒，1D N掺杂的碳纳米管和3D多孔网络），高表面积（143.5–205.8 m ² g ^-1））和出色的热氧化稳定性（≥350°C）。得益于这些功能，经过优化的CoNi @ NCNT复合材料表现出超强的MA性能，在10 wt％的低填充量下，最小RL值高达-64.5 dB（吸收99.9999％的微波），这比以前的填充剂要好得多。那些。微波吸收机理的研究表明，复合材料团簇中适度的介电损耗和弱磁损耗以及多孔结构共同促进了阻抗匹配和微波衰减能力的提高。这项工作可能为在低填充量下制造具有超强微波吸收能力的低成本轻质材料铺平道路。

更新日期：2020-10-16

点击分享查看原文

点击收藏

阅读更多本刊最新论文本刊介绍/投稿指南11