反射损耗
材料科学
介电损耗
电介质
微波食品加热
极化(电化学)
纳米颗粒
散射
复合数
纳米花
化学工程
兴奋剂
纳米技术
复合材料
光电子学
纳米结构
光学
物理
工程类
物理化学
量子力学
化学
作者
Zhengchen Wu,Chen Jin,Ziqi Yang,Renchao Che
出处
期刊:Carbon
[Elsevier]
日期:2022-04-01
卷期号:189: 530-538
被引量:47
标识
DOI:10.1016/j.carbon.2021.12.073
摘要
Integration of hierarchical polarizations within one nanoarchitecture combines superiorities of strong dielectric polarization loss and matched characteristic impedance for enhancing microwave absorption (MA) performance. However, accurate regulation of polarization relaxations in hierarchical composites remains a considerable challenge. Herein, novel Mo2[email protected], P dual-doped carbon microspheres with excellent MA performance have been prepared via a facile yeast-template method. The collaborative composite consists of a hierarchically porous carbon substrate, the embedded ultrafine Mo2C nanoparticles, and the decorated Mo2C/C nanoflowers. Their maximum reflection loss value reaches as much as −50.6 dB and the effective absorption bandwidth is up to 5.4 GHz with a thickness of 2.5 mm, which are superior to those of most carbonaceous absorbents reported previously. These excellent data mainly result from the following three mechanisms. First, multiple heterointerfaces among the air, carbon matrix, and Mo2C nanoparticles contribute to the strong dielectric polarization loss capacity. Second, the doping of heteroatoms doped can trigger intensive dipole polarization. Third, porous structure induces strong space charge polarization and multiple scattering of electromagnetic waves. These achievements provide a biotemplate method for the general preparation of porous metals or metal compounds/carbon composites with broad application prospects in the MA field.
科研通智能强力驱动
Strongly Powered by AbleSci AI