材料科学
石墨烯
碳纳米管
反射损耗
微波食品加热
复合材料
电磁辐射
电介质
兴奋剂
介电损耗
氧化物
偶极子
复合数
光电子学
纳米技术
光学
化学
物理
有机化学
冶金
量子力学
作者
Zhihao Sun,Zhaoqian Yan,Kaicheng Yue,Anran Li,Lei Qian
标识
DOI:10.1016/j.apsusc.2020.147943
摘要
A composite of nitrogen-doped reduced graphene oxide and carbon nanotubes ([email protected]) was prepared. As the mass ratio of CNTs to rGO increasing, the conductive pathways inside the [email protected] were gradually formed with strong electronic transmission ability, which contributed to the conversion of electromagnetic energy into thermal energy. Besides, the nest-like "CNTs clusters", abundant wrinkled layers and through-tubes were favorable for multiple scattering and polarization of electromagnetic waves. More electromagnetic waves were further dissipated in the form of thermal energy. Doping of N atoms introduced a large number of defects and electronic dipoles among the carbon lattice, which could induce the polarization relaxation for higher dielectric loss to attenuate more electromagnetic waves. The experimental results suggested that the multi-scale structure endowed the composite with well-matched impedance, rich loss modes and strong loss, attributed to electronic conduction, defects polarization as well as dipolar polarization, etc. The resulted [email protected]0.3 exhibited the remarkable microwave absorption performance under the ultra-low mass loading of only 2 wt%. Its effective bandwidth was broad and up to 7.1 GHz (10.5–17.6 GHz) with the minimum reflection loss of −49.4 dB.
科研通智能强力驱动
Strongly Powered by AbleSci AI