Abstract Designing an effective conducting network to arouse conduction loss is an effective strategy to boost the microwave absorption properties while decreasing the filler weight fraction of absorbers in the matrix. Here, hierarchical carbon nanotubes vertically anchored on elliptical-like carbon nanosheets (Co/C nanosheet@CNTs composite) have been successfully prepared sintering of ZIF-67 in Ar/H2 flow, where the density and length of CNTs on Co/C nanosheet surfaces were effectively controlled by adjusting the heating temperature. When the pyrolysis temperature was 700 °C, high density of curved CNTs were formed on the surface of Co/C nanosheet surfaces and constructed an interconnected network, which resulted in the enhanced conduction loss as irradiated by microwave. Accordingly, it exhibited high-performance microwave absorbing, and the maximum reflection loss reached -51.8 dB GHz and the effective absorbing bandwidth (EAB) achieved 5.9 GHz with only 5 wt% additive in paraffin, which is even superior to the corresponding Co/C nanosheet composite with 10 wt% filler content. This work provides a new direction to fabricate carbon-based absorber with high-performance at low filler loading.

中文翻译：

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结构设计的分层碳纳米管垂直锚定在椭圆形碳纳米片上，具有增强的传导损耗作为高性能电磁波吸收剂

摘要 设计有效的传导网络以引起传导损耗是提高微波吸收性能同时降低基体中吸收剂的填料重量分数的有效策略。在这里，垂直锚定在椭圆形碳纳米片（Co/C 纳米片@CNTs 复合材料）上的分层碳纳米管已成功制备，在 Ar/H2 流中烧结 ZIF-67，其中 Co/C 纳米片表面上 CNT 的密度和长度通过调节加热温度得到有效控制。当热解温度为 700 °C 时，Co/C 纳米片表面形成高密度的弯曲 CNTs 并构建互连网络，导致微波辐射增强的传导损耗。因此，它表现出高性能的微波吸收，最大反射损耗达到-51.8 dB GHz，有效吸收带宽（EAB）达到5.9 GHz，仅在石蜡中添加5 wt%的添加剂，这甚至优于相应的具有10 wt%填料含量的Co/C纳米片复合材料。这项工作为在低填料负载下制造具有高性能的碳基吸收剂提供了新的方向。