Core-Shell Structured SiO2@NiFe LDH Composite for Broadband Electromagnetic Wave Absorption

Zhilan Du; Dashuang Wang; Xinfang Zhang; Zhiyu Yi; Jihai Tang; Pingan Yang; Rui Cai; Shuang Yi; Jinsong Rao; Yuxin Zhang

doi:10.3390/ijms24010504

Core-Shell Structured SiO₂@NiFe LDH Composite for Broadband Electromagnetic Wave Absorption

Int J Mol Sci. 2022 Dec 28;24(1):504. doi: 10.3390/ijms24010504.

Authors

Zhilan Du¹, Dashuang Wang¹, Xinfang Zhang¹, Zhiyu Yi¹, Jihai Tang², Pingan Yang³, Rui Cai³, Shuang Yi¹, Jinsong Rao¹, Yuxin Zhang¹

Affiliations

¹ College of Material Science and Engineering, Chongqing University, Chongqing 400044, China.
² No. 59 Research Institute of China Ordnance Industries, Chongqing 400039, China.
³ School of Automation, Chongqing University of Posts and Telecommunications, Chongqing 400065, China.

Abstract

In this work, a novel core-shell structure material, NiFe layered double hydroxide (NiFe LDH) loaded on SiO2 microspheres (SiO2@NiFe LDH), was synthesized by a one-step hydrothermal method, and the spontaneous electrostatic self-assembly process. The morphology, structure, and microwave absorption properties of SiO2@NiFe LDH nanocomposites with different NiFe element ratios were systematically investigated. The results show that the sample of SiO2@NiFe LDH-3 nanocomposite has excellent microwave absorption properties. It exhibits broadband effective absorption bandwidth (RL < −10 dB) of 8.24 GHz (from 9.76 GHz to 18.0 GHz) and the reflection loss is −53.78 dB at the matched thickness of 6.95 mm. It is expected that this SiO2@NiFe-LDH core-shell structural material can be used as a promising non-precious, metal-based material microwave absorber to eliminate electromagnetic wave contamination.

Keywords: LDH; SiO2 microspheres; core-shell structure; microwave absorption.

MeSH terms

Absorption, Radiation*
Drug Contamination
Microspheres
Microwaves
Silicon Dioxide*

Substances

Silicon Dioxide

Grants and funding

The authors gratefully acknowledge the financial support provided by Graduate Scientific Research and Innovation Foundation of Chongqing, China (CYS22005, CYB22007), the National Natural Science Foundation of China (Grant No. 52005290, 51908092), Scientific Research Project of Chongqing Ecological Environment Bureau (No. CQEE2022-STHBZZ118), Projects (No. 2020CDJXZ001, 2021CDJJMRH-005 and SKLMT-ZZKT-2021M04) supported by the Fundamental Research Funds for the Central Universities, the Joint Funds of the National Natural Science Foundation of China-Guangdong (Grant No. U1801254), the project funded by Chongqing Special Postdoctoral Science Foundation (2021XM3065), the Chongqing Research Program of Basic Research and Frontier Technology (cstc2017jcyjBX0080), Natural Science Foundation Project of Chongqing for Post-doctor (cstc2019jcyjbsh0079, cstc2019jcyjbshX0085), Technological projects of Chongqing Municipal Education Commission (KJZDK201800801), the Innovative Research Team of Chongqing (CXTDG201602014) and the Innovative technology of New materials and metallurgy (2019CDXYCL0031). The authors also thank the Electron Microscopy Center of Chongqing University for materials characterizations.