Cu-Co Hybrid Crystals Assembled on Hollow Microsphere: Temperature-Dependent Top-Down Synthesis and Aggregation-Induced Conversion from Microwave Shielding to Absorption
Qianqian Jia, Zhenguo An, Man Li, Ran Liu, Weixin Xiao, Jingjie Zhang
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引用次数: 4
Abstract
The construction of hollow metallic microspheres with rationally designed building blocks of the metal shell is a promising way to achieve low density and functionality control, but the microengineering of the metallic structures on a micrometer spherical surface is a great challenge. In the present work, a novel and simple calcination-induced aggregation strategy is developed to realize the distribution status and microstructure control of Co-Cu bimetal building blocks assembled on a hollow glass microsphere support, and thus a series of low-density (0.58 g cm−3) dual shell composite hollow microspheres are constructed with gradient in electromagnetic property depending on the calcination temperature (CT). The optimized microwave shielding performance can be achieved at a CT of 500 °C, while further increasing CT to 700 °C leads to an interesting conversion from microwave shielding to absorption with an optimized effective absorption bandwidth of 4.64 GHz at a low matching thickness of 1.33 mm. The mechanism underlying the CT-dependent metallic shell structure variation and further the decisive effect of the shell structure on the microwave response behavior are proposed based on a series of contrast experiments.
利用合理设计的金属壳构件构建空心金属微球是实现低密度和功能控制的一种很有前途的方法,但在微米球形表面上实现金属结构的微工程是一个巨大的挑战。本文提出了一种新型的、简单的煅烧诱导聚集策略,实现了Co-Cu双金属构件在中空玻璃微球支架上的分布状态和微观结构控制,从而构建了一系列低密度(0.58 g cm−3)的双壳复合中空微球,其电磁性能随煅烧温度(CT)的变化而变化。优化的微波屏蔽性能可以在500°C的CT下实现,而进一步提高CT到700°C可以实现从微波屏蔽到吸收的有趣转换,在低匹配厚度为1.33 mm时,优化的有效吸收带宽为4.64 GHz。在一系列对比实验的基础上,提出了ct相关金属壳结构变化的机制,并进一步提出了壳结构对微波响应行为的决定性影响。
期刊介绍:
Small serves as an exceptional platform for both experimental and theoretical studies in fundamental and applied interdisciplinary research at the nano- and microscale. The journal offers a compelling mix of peer-reviewed Research Articles, Reviews, Perspectives, and Comments.
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