Abstract Environment-friendly Fe-based material@N-doped carbon nanoparticles imbedded in polylactic acid (PLA) matrix are prepared and applied in microwave absorption field. In the synthesis process, polydopamine (PDA) in the precursor could rationally regulate the phases of the iron-based particles and carbon contents. It turns out that optimizing the chemical composition plays a vital role in modulating microwave absorption performance. For instance, the maximum reflection loss (RLmax) for Fe@N-doped carbon particles (S-120) reaches −61.6 dB (12.56 GHz, 2.1 mm), and the effective bandwidth is 4.48 GHz (from 13.52 GHz to 18 GHz) with a thickness of only 1.7 mm. The excellent microwave absorption performance could be attributed to perfect impedance matching brought by the synergies of multiple components. Moreover, the microwave absorbers display not only high microwave absorption performance but also environment-friendly characteristics that can avoid leaving stubborn waste after failure. The preparation process of the composite is pollution-free and the PLA in the composite can almost be naturally degraded within one month under simulated marine environment. This work may provide a new perspective on preparing high-efficient functional materials which are also harmless to the environment.

中文翻译：

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Fe基材料@N掺杂碳复合材料作为环境友好型微波吸收剂

摘要 制备了嵌入聚乳酸（PLA）基体的环保铁基材料@N掺杂碳纳米粒子，并应用于微波吸收领域。在合成过程中，前驱体中的聚多巴胺（PDA）可以合理调节铁基颗粒的相态和碳含量。事实证明，优化化学成分在调节微波吸收性能方面起着至关重要的作用。例如，Fe@N掺杂碳颗粒（S-120）的最大反射损耗（RLmax）达到-61.6 dB（12.56 GHz，2.1 mm），有效带宽为4.48 GHz（从13.52 GHz到18 GHz）厚度仅为 1.7 毫米。优异的微波吸收性能可归因于多个组件协同作用带来的完美阻抗匹配。而且，微波吸收器不仅具有较高的吸波性能，而且具有环保特性，可避免失效后留下顽固废物。该复合材料的制备过程无污染，在模拟海洋环境下，复合材料中的PLA几乎可以在一个月内自然降解。这项工作可能为制备对环境无害的高效功能材料提供新的视角。