Influence of N-doping on dielectric properties of carbon-coated copper nanocomposites in the microwave and terahertz ranges
N掺杂对微波和太赫兹范围内碳涂层铜纳米复合材料介电性能的影响
マイクロ波とテラヘルツ領域における炭素被覆銅ナノ複合材料の誘電特性に対するNドーピングの影響
N 혼합이 마이크로파 및 테라헤르츠 범위 내의 탄소 코팅 구리 나노 복합재료 매전 성능에 미치는 영향
Efectos del dopaje n en las propiedades dieléctrico de los nanocompuestos de cobre recubiertos de carbono en el rango de microondas y terahertz
Effet du dopage n sur les propriétés diélectriques des Nanocomposites de cuivre revêtus de carbone dans la gamme micro - ondes et terahertz
влияние n - легирующей примеси на диэлектрические свойства медно - нанотряженных композиционных материалов с углеродным покрытием в диапазоне микроволн и тахц
¹ Key Laboratory of Materials Modification by Laser, Ion and Electron Beams (Ministry of Education), School of Materials Science and Engineering, Dalian University of Technology, Dalian, 116024, China
中国 大连 大连理工大学 材料科学与工程学院 三束材料改性教育部重点实验室
² College of Physics and Optoelectronic Engineering, Shenzhen University, Shenzhen, 518060, China
深圳大学 物理与光电工程学院
³ Institute of Advanced Magnetic Materials, College of Materials and Environmental Engineering, Hangzhou Dianzi University, Hangzhou, 110819, China
中国 杭州 杭州电子科技大学 材料与环境工程学院 磁性材料研究院
⁴ Shenyang National Laboratory for Materials Science, Institute of Metal Research, Chinese Academy of Sciences, Shenyang, 110015, China
中国 沈阳 中国科学院金属研究所 沈阳材料科学国家（联合）实验室
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.
