Tuning the shell thickness of core-shell α-Fe2O3@SiO2 nanoparticles to promote microwave absorption
Tuning the shell thickness of core-shell α-Fe2O3@SiO2 nanoparticles to promote microwave absorption
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DOI：
10.1016/j.cclet.2021.07.027
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发表时间：
2022-02-22
影响因子：
9.1
通讯作者：
Zhang, Wei
中科院分区：
文献类型：
--
作者：
Fu, Honghong;Guo, Yue;Zhang, Wei
人们已经开发出各种先进的微波吸收材料来减少/避免微波辐射的危害。其中，核壳结构纳米材料已被广泛制备用于微波吸收。然而，壳厚度与微波吸收性能之间的“结构-性能”关系却鲜有报道。在本文中，我们首先基于具有恒定α-Fe2O3-核尺寸和可变SiO2-壳厚度的核-壳α-Fe2O3@SiO2纳米颗粒，探讨了壳厚度与微波吸收性能之间的“结构-性能”关系。随着SiO2壳层厚度的增加,微波吸收能力先增加后下降。在适当的SiO2壳厚度为35 nm的情况下，α-Fe2O3@SiO2样品实现了最强的微波吸收能力，反射损耗最小值为-4.3 dB，优于纯α-Fe2O3 (-3.8 dB)。这种增强的微波吸收性能主要来自介电损耗。尽管反射损耗的绝对值相对较低（-4.3 dB），但该研究为设计下一代先进氧化铁基微波吸收材料提供了重要参考。 (C) 2021 由Elsevier B.V.代表中国化学会和中国医学科学院药物研究所出版。
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 alpha-Fe2O3@SiO2 nanoparticles with a constant alpha-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, alpha-Fe2O3@SiO2 sample achieved the strongest microwave absorbing ability with a reflection loss minimum value of -4.3 dB, better than that of pure alpha-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. (C) 2021 Published by Elsevier B.V. on behalf of Chinese Chemical Society and Institute of Materia Medica, Chinese Academy of Medical Sciences.