Construction of hollow core-shelled nitrogen-doped carbon-coated yttrium aluminum garnet composites toward efficient microwave absorption

Hui Luo; Beibei Ma; Fu Chen; Shanshan Zhang; Xian Wang; Yao Xiong; Yongzhi Cheng; Rongzhou Gong

doi:10.1016/j.jcis.2022.04.054

Construction of hollow core-shelled nitrogen-doped carbon-coated yttrium aluminum garnet composites toward efficient microwave absorption

J Colloid Interface Sci. 2022 Sep 15:622:181-191. doi: 10.1016/j.jcis.2022.04.054. Epub 2022 Apr 25.

Authors

Hui Luo¹, Beibei Ma¹, Fu Chen², Shanshan Zhang¹, Xian Wang³, Yao Xiong¹, Yongzhi Cheng¹, Rongzhou Gong⁴

Affiliations

¹ School of Information Science and Engineering, Wuhan University of Science and Technology, Wuhan 430081, People's Republic of China.
² School of Information Science and Engineering, Wuhan University of Science and Technology, Wuhan 430081, People's Republic of China. Electronic address: chenfu@wust.edu.cn.
³ School of Optical and Electronic Information, Huazhong University of Science and Technology, Wuhan 430074, People's Republic of China. Electronic address: wangx@hust.edu.cn.
⁴ School of Optical and Electronic Information, Huazhong University of Science and Technology, Wuhan 430074, People's Republic of China.

PMID: 35490621
DOI: 10.1016/j.jcis.2022.04.054

Abstract

High-performance microwave absorbing materials (MAMs) play a vital role in electromagnetic (EM) pollution protection. Multi-interfacial heterogeneous structure design has become a mainstream direction for designing and fabricating excellent MAMs. Herein, multi-interfacial hollow core-shelled yttrium aluminum garnet@nitrogen-doped carbon (YAG@NC) composites were synthesized by coprecipitation, thermal treatment, self-polymerization and carbonization processes. Thermal treatment temperatures were used to regulate the defect level and interfaces in carbon materials. Defects of NC and multiple interfaces favor dielectric polarization, and the hollow cavity endows the MAMs with lightweight characteristics and ideal impedance matching. The results indicated that YAG@NC composites possess excellent microwave absorption properties with an effective absorption bandwidth (EAB) of 5.5 GHz at an absorber thickness of only 1.95 mm. The radar cross section (RCS) reduction of YAG@NC composites was verified by CST simulation in the far field, and the strongest RCS reduction value was up to 32.64 dBm² with a scattering angle of 0°. This work paves the way for designing multicomponent microstructure dielectric loss absorbers with broadband and strong microwave absorption.

Keywords: Defects; Hollow core-shelled structure; Microwave absorption; Multi-interface.