Carbon-coated Cu nanocomposites (Cu@C NCs) consisting of core-shell nanoparticles and nanorods were synthesized by arc discharge plasma under an atmosphere of He and H₂ gas, and the N-doping of them was achieved by a post-treatment process using ureal as the precursor. The concentration of N in the N-doped samples varies in the range of 0.62%–2.31 % (in mole), with a transformation from pyrrolic N to graphitic N when increasing the relative content of ureal. Dielectric properties of the NCs without or with N-doping in the microwave and THz bands were investigated. The N-doped samples achieve the enhanced dielectric loss in both microwave and THz bands. In the microwave band, dielectric loss was dominated by interfacial polarization, dipolar polarization, and conduction loss, while in the THz band, plasma resonance, ionic polarization and conduction loss are responsible for the dielectric loss, with a strong absorption characteristic dominated by conductive effect.

_{在He和H 2}气氛下通过电弧放电等离子体合成了由核壳纳米颗粒和纳米棒组成的碳包覆Cu纳米复合材料（Cu@C NCs）气体，并且它们的N掺杂是通过使用脲作为前体的后处理工艺来实现的。N 掺杂样品中 N 的浓度在 0.62%–2.31%（摩尔）范围内变化，当增加脲的相对含量时，从吡咯 N 转变为石墨 N。研究了在微波和太赫兹波段中没有或有 N 掺杂的 NC 的介电性能。N掺杂样品在微波和太赫兹波段均实现了增强的介电损耗。在微波波段，介电损耗以界面极化、偶极极化和传导损耗为主，而在太赫兹波段，介电损耗由等离子体共振、离子极化和传导损耗负责，具有以传导效应为主的强吸收特性.