The paper focuses on the synthesis of NiCo/C nanocomposites comprising the Ni–Co alloy nanoparticles uniformly distributed and stabilized in a carbon matrix. The synthesis is performed by using IR pyrolysis of organometallic precursors obtained from a mixture of dymethylformamide solutions of polyacrylonitrile, nickel and cobalt chloride hexahydrates. It is shown how the synthesis temperature and the metal concentration in precursors affect the size and composition of the Ni–Co alloy nanoparticles. Electromagnetic properties of NiCo/C nanocomposites are investigated in the range of 3–12 GHz. The influence of the synthesis conditions is studied in relation to the frequency profiles of the reflection and absorption coefficients. It is shown that radar absorbing properties of NiCo/C nanocomposites can be controlled by changing the synthesis conditions.

本文着重于NiCo / C纳米复合材料的合成，该复合材料包含均匀分布并稳定在碳基质中的Ni-Co合金纳米颗粒。通过IR热解有机金属前体进行合成，该有机金属前体是由聚丙烯腈，镍和氯化钴六水合物的二甲基甲酰胺溶液的混合物获得的。它显示了合成温度和前体中的金属浓度如何影响Ni-Co合金纳米粒子的尺寸和组成。在3–12 GHz范围内研究了NiCo / C纳米复合材料的电磁性能。关于反射和吸收系数的频率分布，研究了合成条件的影响。