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刘云等撰写的论文被ACS App. Mater. Inter接收

发布时间:2018-04-21

        博士生刘云等撰写的论文 "Low-Cost Carbothermal Reduction Preparation of Monodisperse Fe3O4/C Core-Shell Nanosheets for Improved Microwave Absorption" 被美国化学会期刊ACS Applied Materials & Interfaces(工程技术一区top期刊,影响因子7.504)接收!该论文报道了一种在 片状Fe3O4纳米粒子表面包覆薄碳壳层复合粒子的简单碳热还原方法,制备的复合粒子与单纯的Fe3O4纳米片比较具有较高的介电常数和磁共振频率,从而能用于制备具有增强吸波性能的吸波材料。

       原文摘要如下:This paper demonstrates a facile and low-cost carbothermal reduction preparation of monodisperse Fe3O4/C core-shell nanosheets (NSs) for greatly improved microwave absorption. In this protocol, the redox reaction between sheet-like hematite (α-Fe2O3) precursors and acetone under inert atmosphere and elevated temperature generates Fe3O4/C core-shell NSs with the morphology inheriting from α-Fe2O3. Thus, Fe3O4/C core-shell NSs of different sizes (a) and Fe3O4/C core-shell nanopolyhedrons are obtained by using different precursors. Benefited from the high crystallinity of Fe3O4 core and thin carbon layer, the resultant NSs exhibit high specific saturation magnetization larger than 82.51 emu·g−1. Simultaneously, the coercivity enhances with the increase of a, suggesting a strong shape anisotropy effect. Furthermore, due to the anisotropy structure and the complementary behavior between Fe3O4 and C, the as-obtained Fe3O4/C core-shell NSs exhibit strong natural magnetic resonance at a high frequency, enhanced interfacial polarization and improved impedance matching, ensuring the enhancement of the microwave absorption. The 250 nm NSs-paraffin composites exhibit reflection loss (RL) lower than −20 dB (corresponding to 99% absorption) in a large frequency (f) range of 2.08−16.40 GHz with a minimum RL of –43.95 dB at f = 3.92 GHz when the thickness is tuned from 7.0 mm to 1.4 mm, indicating that the Fe3O4/C core-shell NSs are a good candidate to manufacture high-performance microwave absorbers. Moreover, the as-developed carbothermal reduction method could be applied for the fabrication of other composites based on ferrites and carbon.
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