Synthesis and Microwave Absorption Property of Fe3O4- Carbon Sphere Composite
Fe3 O4-carbon sphere composite was synthesized using vitamin C as carbon precursor at 160 o C for 8 h by a simple hydrothermal method. The as-synthesized products were characterized by X-ray diffraction (XRD), Raman spectrum, Transmission electron microscopy (TEM), Scanning electron microscopy (SEM), and Vibrating sample magnetometer (VSM). The microwave absorption property of Fe3O4?carbon sphere composite was directly measured by vector network analysis. The results show that the products are Fe3 O4?carbon sphere structures with average diameter of 3.5 μm. These sphere-like structures are further composed of many Fe3 O4 nanoparticles with average diameter of 15 nm. A possible mechanism was suggested to explain the formation of Fe3O4?carbon sphere structures. The products have superparamagnetic behaviour with a saturation magnetization of 42 emu/g at room temperature. The Fe3O4?carbon sphere composite exhibits a broad microwave absorption ranging from 2 to 18 GHz with reflection loss value as low as ?40 dB at 4.7GHz, displaying good microwave absorbing property.
Yuanguang Zhang Yingguo Zhao Xiang Yan Kai Zhang
Provincial Key Laboratory of Functional Coordination Compounds, Anqing Normal College, Anqing , China
国际会议
长春
英文
1-4
2011-08-29（万方平台首次上网日期，不代表论文的发表时间）