Synthesis and Microwave Absorption Properties of Yolk鈥揝hell Microspheres with Magnetic Iron Oxide Cores and Hierarchical Copper Silicate Shells

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• 作者：Jiwei Liu ; Jin Cheng ; Renchao Che ; Junjie Xu ; Mengmei Liu ; Zhengwang Liu
• 刊名：ACS Applied Materials & Interfaces
• 出版年：2013
• 出版时间：April 10, 2013
• 年：2013
• 卷：5
• 期：7
• 页码：2503-2509
• 全文大小：497K
• 年卷期：v.5,no.7(April 10, 2013)
• ISSN：1944-8252

文摘

Yolk鈥搒hell microspheres with magnetic Fe₃O₄ cores and hierarchical copper silicate shells have been successfully synthesized by combining the versatile sol鈥揼el process and hydrothermal reaction. Various yolk鈥搒hell microspheres with different core size and shell thickness can be readily synthesized by varying the experimental conditions. Compared to pure Fe₃O₄, the as-synthesized yolk鈥搒hell microspheres exhibit significantly enhanced microwave absorption properties in terms of both the maximum reflection loss value and the absorption bandwidth. The maximum reflection loss value of these yolk鈥搒hell microspheres can reach 鈭?3.5 dB at 7 GHz with a thickness of 2 mm, and the absorption bandwidths with reflection loss lower than 鈭?0 dB are up to 10.4 GHz. Owing to the large specific surface area, high porosity, and synergistic effect of both the magnetic Fe₃O₄ cores and hierarchical copper silicate shells, these unique yolk鈥搒hell microspheres may have the potential as high-efficient absorbers for microwave absorption applications.

Keywords:

yolk鈭抯hell; magnetite; copper silicate; hydrothermal synthesis; microwave absorption