One-dimensional Ag-CoNi nanocomposites modified with amorphous Sn(OH)2/SnO2 shells for broadband microwave absorption

Mingtao Qiao; Jiaxin Li; Tiantian Chen; Xiaowei He; Meiyu Meng; Xingfeng Lei; Jian Wei; Qiuyu Zhang

doi:10.1016/j.jcis.2021.07.017

One-dimensional Ag-CoNi nanocomposites modified with amorphous Sn(OH)₂/SnO₂ shells for broadband microwave absorption

J Colloid Interface Sci. 2021 Dec 15:604:616-623. doi: 10.1016/j.jcis.2021.07.017. Epub 2021 Jul 7.

Authors

Mingtao Qiao¹, Jiaxin Li², Tiantian Chen², Xiaowei He³, Meiyu Meng³, Xingfeng Lei³, Jian Wei⁴, Qiuyu Zhang⁵

Affiliations

¹ College of Materials Science and Engineering, Xi'an University of Architecture & Technology, Xian 710055, Shaanxi, PR China; School of Chemistry and Chemical Engineering, Northwestern Polytechnical University, Xi'an 710072, PR China; Shaanxi Key Laboratory of Nano-materials and Techanology, Xi'an University of Architecture & Technology, Xian 710055, Shaanxi, PR China. Electronic address: mtqiao@xauat.edu.cn.
² College of Materials Science and Engineering, Xi'an University of Architecture & Technology, Xian 710055, Shaanxi, PR China.
³ School of Chemistry and Chemical Engineering, Northwestern Polytechnical University, Xi'an 710072, PR China.
⁴ College of Materials Science and Engineering, Xi'an University of Architecture & Technology, Xian 710055, Shaanxi, PR China; Shaanxi Key Laboratory of Nano-materials and Techanology, Xi'an University of Architecture & Technology, Xian 710055, Shaanxi, PR China. Electronic address: weijian@xauat.edu.cn.
⁵ School of Chemistry and Chemical Engineering, Northwestern Polytechnical University, Xi'an 710072, PR China; MOE Key Laboratory of Material Physics and Chemistry under Extraordinary Condition, Ministry of Education, Northwestern Polytechnical University, Xi'an 710072, PR China.

PMID: 34280759
DOI: 10.1016/j.jcis.2021.07.017

Abstract

High-performance microwave absorption absorbers play important roles in the fields of radar stealth, electromagnetic protection, and antenna technology. In this work, high aspect-ratio Ag nanowires were decorated with magnetic CoNi nanoparticles via a PVP-induced solvothermal method, and then amorphous Sn(OH)₂/SnO₂ shells were introduced through an in-situ oxidative hydrolysis method, successfully preparing Ag-CoNi@Sn(OH)₂/SnO₂ composites. The morphology and ingredient of composites were ascertained by SEM, TEM, XRD, EDX, and XPS. As Ag-CoNi nanocomposites are coated by Sn(OH)₂/SnO₂ shells, the minimum reflection loss value is decreased from -31.7 dB (10.1 GHz) to -37.8 dB (6.4 GHz), and the maximum effective absorption bandwidth is extended from 3.9 GHz (10.3-14.2 GHz) to 5.8 GHz (10.7-16.5 GHz). Analyses of electromagnetic parameters reveal the possible mechanisms, involving surface plasma resonance, conductive loss, interfacial polarization, dipole polarization, exchange resonance, eddy current effect, multiple reflection and scattering. Thus, Ag nanowires modified with CoNi nanoparticles and amorphous Sn(OH)₂/SnO₂ shells can effectively balance the impedance matching and attenuation capability. It is a new strategy to achieve broadband microwave absorbers.

Keywords: Ag nanowires; Amorphous shells; CoNi nanoparticles; Microwave absorption.