Citation: Honghong Fu, Yue Guo, Jian Yu, Zhen Shen, Jie Zhao, Yu Xie, Yun Ling, Sheng Ouyang, Shiqi Li, Wei Zhang. Tuning the shell thickness of core-shell α-Fe₂O₃@SiO₂ nanoparticles to promote microwave absorption[J]. Chinese Chemical Letters, ;2022, 33(2): 957-962. doi: 10.1016/j.cclet.2021.07.027 shu

Tuning the shell thickness of core-shell α-Fe₂O₃@SiO₂ nanoparticles to promote microwave absorption

Honghong Fu ^{a, 1} ,
Yue Guo ^{c, 1} ,
Jian Yu ^{d, 1} ,
Zhen Shen ^c ,
Jie Zhao ^{a, c, *,} ,
Yu Xie ^{a, *,} ,
Yun Ling ^a ,
Sheng Ouyang ^{b, *,} ,
Shiqi Li ^a ,
Wei Zhang ^{e, *,}

a.
Department of Materials Chemistry, School of Environment and Chemical Engineering, Nanchang Hangkong University, Nanchang 330063, China
b.
Instrumental Analysis Center of Nanchang Hangkong University, Nanchang 330063, China
c.
School of Chemistry and Chemical Engineering, Nanjing University, Nanjing 210023, China
d.
Research Institute of Aero-Engine, Beihang University, Beijing 100191, China
e.
School of Ecology and Environment, Zhengzhou University, Zhengzhou 450001, China

zhaojienju@163.com

xieyu_121@163.com

lqfoys@163.com

zhangwei88@zzu.edu.cn

Received Date: 9 April 2021
Revised Date: 6 June 2021
Accepted Date: 8 July 2021
Available Online: 15 July 2021

Figures(5)

Various advanced microwave absorbing materials have been developed for reducing/avoiding the harm of microwave radiation. Among them, core-shell structural nanomaterials have been widely fabricated for microwave absorption. However, the "structure-performance" relationship between shell thickness and microwave absorption performance is rarely reported. In this paper, we first explored the "structure-performance" relationship between shell thickness and microwave absorption performance, based on the core-shell α-Fe₂O₃@SiO₂ nanoparticles with a constant α-Fe₂O₃-core size and changeable SiO₂-shell thickness. With increasing the SiO₂-shell thickness, the microwave absorption ability first increased, then decreased. Under a proper SiO₂-shell thickness of 35 nm, α-Fe₂O₃@SiO₂ sample achieved the strongest microwave absorbing ability with a reflection loss minimum value of –4.3 dB, better than that of pure α-Fe₂O₃ (–3.8 dB). This enhanced microwave absorption performance was mainly derived from the dielectric loss. Although the absolute value of the reflection loss was relatively low (–4.3 dB), this study shed an important reference on designing next-generation advanced iron oxide-based materials for microwave absorption.
- α-Fe₂O₃@SiO₂,
- Core-shell structure,
- Microwave absorption,
- Dielectric loss,
- Interfacial polarization,
- Conductivity loss
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Tuning the shell thickness of core-shell α-Fe₂O₃@SiO₂ nanoparticles to promote microwave absorption