Excellent microwave absorption performance of LaFeO3/Fe3O4/C perovskite composites with optimized structure and impedance matching

被引：179

作者：

He, Xue ^{[1
,2
]}

Xiong, Zhiqiang ^{[1
,2
]}

Lei, Chunwei ^{[1
,2
]}

Shen, Zhongjing ^{[1
,2
]}

Ni, Anqi ^{[1
,2
]}

Xie, Yu ^{[1
,2
]}

Liu, Chongbo ^{[1
,2
]}

机构：

[1] Nanchang Hangkong Univ, Key Lab Jiangxi Prov Persistent Pollutants Control, Nanchang 330063, Peoples R China

[2] Nanchang Hangkong Univ, Sch Environm & Chem Engn, Nanchang 330063, Peoples R China

来源：

CARBON | 2023年 / 213卷

基金：

中国国家自然科学基金;

关键词：

Hollow and spiral carbon; 3d-4f Metal-organic frameworks; Perovskite composites; Impedance matching; Microwave absorption; CARBON-BASED COMPOSITES; ENHANCEMENT; POLYANILINE; DESIGN;

D O I：

10.1016/j.carbon.2023.118200

中图分类号：

O64 [物理化学（理论化学）、化学物理学];

学科分类号：

070304 ; 081704 ;

摘要：

Compositional optimization and structural design are considered to be effective approaches for improving the microwave absorption (MA) ability of carbon-based absorbers. Herein, we have synthesized the LaFeO3/Fe3O4/C perovskite composites by one-step pyrolysis of 3d-4f metal-organic frameworks (MOFs) at a low temperature. The content of LaFeO3 and Fe3O4 can be efficiently controlled by tuning the pyrolysis temperature. For LaFeMOF-650 composite, the effective absorption bandwidth (EAB, RLmin & LE; -10 dB) reaches 7.2 GHz at 2.2 mm under a filling ratio of 50 wt%. Further, the effect of hollow and spiral carbon on the MA performance of 3d-4fMOFs-derived composites is investigated. The minimum reflection loss (RLmin) of the hollow LaFeO3/Fe3O4/C sample with a thickness of 1.82 mm reaches up to -68.3 dB under a filling ratio of 40 wt%. The spiral LaFeO3/ Fe3O4/C sample exhibits an RLmin of -42.3 dB and an EAB of 4.70 GHz at an ultra-low thickness of 1.35 mm under a lower filling ratio of 30 wt%. Benefiting from the structural and compositional advantages, the prepared high-efficiency MA materials with optimized impedance matching and attenuation capability are excellent candidates for high-performance MA materials.

引用

页数：10

共 55 条

[41] Optimization, selective and efficient production of CNTs/CoxFe3-xO4core/shell nanocomposites as outstanding microwave absorbers [J].