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Hierarchical N, S-codoped honeycomb-like porous C@Co9S8@CNTs structure as high-performance microwave absorber
Materials Letters ( IF 3 ) Pub Date : 2020-04-01 , DOI: 10.1016/j.matlet.2020.127342
Xiaoyu Bai , Lei Wang , Ying Lin

Abstract Herein, a facile method is developed to fabricate hierarchical N, S-codoped honeycomb-like porous C@Co9S8@CNTs composites, in which the coating length of carbon nanotubes (CNTs) on the surface of comby porous carbon framework could be easily controlled by the addition of cobalt chloride content in precursor. When the addition of cobalt chloride was 0.26 mmol, the longer CNTs with length of 3.1 µm was formed, which induced have significantly on enhancement of the comprehensive microwave absorption properties of hierarchical N, S-codoped honeycomb-like porous C@Co9S8@CNTs structure. By adding only 10 wt% to paraffin, the resulting composites exhibited a maximum reflection loss of −56.0 dB at 6.5 GHz with 3.4 mm thickness, and the effective bandwidth was 4.64 GHz (5.60–7.76, 15.52–18 GHz). These outstanding microwave absorption properties were ascribed to the stronger dielectric loss by the higher aspect ratio of the CNTs. This work would provide a new direction how to design porous carbon-based microwave absorbers with high performance at low filler loading.

中文翻译:

作为高性能微波吸收剂的分层 N、S 共掺杂蜂窝状多孔 C@Co9S8@CNTs 结构

摘要 本文开发了一种简便的方法来制备分层 N、S 共掺杂蜂窝状多孔 C@Co9S8@CNTs 复合材料,其中碳纳米管 (CNT) 在组合多孔碳骨架表面的涂层长度可以很容易地控制。通过在前体中添加氯化钴含量。当氯化钴的加入量为0.26 mmol时,形成了长度为3.1 µm的更长的CNTs,这显着增强了分层N、S-共掺杂蜂窝状多孔C@Co9S8@CNTs结构的综合微波吸收性能. 通过向石蜡中仅添加 10 wt%,所得复合材料在 6.5 GHz 处的最大反射损耗为 -56.0 dB,厚度为 3.4 mm,有效带宽为 4.64 GHz(5.60-7.76、15.52-18 GHz)。这些出色的微波吸收特性归因于更高的碳纳米管纵横比带来的更强的介电损耗。这项工作将为如何设计在低填料负载下具有高性能的多孔碳基微波吸收剂提供新的方向。
更新日期:2020-04-01
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