A Liquid‐Metal‐Assisted Competitive Galvanic Reaction Strategy Toward Indium/Oxide Core−Shell Nanoparticles with Enhanced Microwave Absorption

Author:

Zhao Biao12ORCID,Yan Zhikai3,Liu Lulu2,Zhang Yuanyuan2,Guan Li2,Guo Xiaoqin2,Li Ruosong4,Che Renchao5,Zhang Rui2

Affiliation:

1. School of Microelectronics Fudan University Shanghai 200433 China

2. Henan Key Laboratory of Aeronautical Materials and Application Technology School of Material Science and Engineering Zhengzhou University of Aeronautics Zhengzhou Henan 450046 China

3. School of Materials and Chemistry University of Shanghai for Science and Technology Shanghai 200093 China

4. School of Chemical Engineering Northwest University Xi'an Shaanxi 710069 China

5. Laboratory of Advanced Materials and Collaborative Innovation Center of Chemistry for Energy Materials (iChem) Fudan University Shanghai 200438 China

Abstract

AbstractThe preparation of core–shell structured nanoparticles using the galvanic replacement reaction of liquid metals is a simple and efficient method. However, precise modulation of the core and shell components to regulate the microwave absorption performance still needs to be further explored. In this study, various types of indium/oxide core–shell nanoparticles are prepared based on a competitive galvanic reaction of gallium‐indium liquid metals. The prepared indium/oxide core–shell structured nanoparticles exhibit superior electromagnetic (EM) wave absorption properties with a minimum reflection loss (RL) of −40.25 dB at 1.7 mm and the widest effective absorption band of 6.12 GHz at 2.1 mm. The superior wave‐absorbing properties originate from the dielectric losses of the interfacial and dipole polarizations. In addition, an externally applied magnetic field improves the polarization loss and microwave dissipation to achieve a minimum RL of −45.65 dB at 2.4 mm. The liquid‐metal‐assisted competitive galvanic reaction strategies extend the variety of core–shell structured nanoparticles for electromagnetic wave absorption applications.

Funder

National Natural Science Foundation of China

Publisher

Wiley

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