Elemetal doping is an efficient strategy to adjust the microstructue and electronic property of a carbon material, as a result, shows great potential in the design of novel electromagnetic absorption (EMA) materials. In this work, we report an useful strategy to prepare a N,S co-doped carbon (NSC) using TTF-TCNQ as the precusor, and systematically explore its frequency-depedent dielectric and EMA properties. Different N/S ratios can be tuned by the regulation of pyrolitic temperature. The derived NSC exhibits wonderful EMA performance when the pyrolytic temperature is setted to 700 ℃ with loading ratio of 35 wt%. Efficient absorption can be achieved in the frequency range of 6.4–18 GHz. Moreover, it is determined that the efficient absorption bandwidth gets to 6.5 GHz, while the maximal absorption reaches −46 dB. The EMA mechanism of NSC is considered to be mainly contributed by improved impedance matching realized by macropores, enhanced conductance loss caused by well constructed condutive network, and polarization by N,S doping. This research provides a new idea for development of novel carbon materials for EMA applicaion.

Elemetal掺杂是一种调节碳材料微观结构和电子性质的有效策略，因此在新型电磁吸收（EMA）材料的设计中显示出巨大的潜力。在这项工作中，我们报告了一种有用的策略来准备N,S使用 TTF-TCNQ 作为前驱体的共掺杂碳 (NSC)，并系统地探索其频率相关的介电和 EMA 特性。通过调节热解温度可以调节不同的 N/S 比。当热解温度设置为 700 ℃，负载率为 35 wt% 时，衍生的 NSC 表现出良好的 EMA 性能。在 6.4-18 GHz 的频率范围内可以实现高效吸收。此外，确定有效吸收带宽达到 6.5 GHz，而最大吸收达到 -46 dB。NSC 的 EMA 机制被认为主要是由大孔实现的改进阻抗匹配、良好构造的导电网络引起的电导损失增强以及 N、S 掺杂引起的极化造成的。