Synthesis of Fe-ferrite composite nanotubes with excellent microwave absorption performance

被引:40
作者
Gong, Yuan-Xun [1 ]
Zhen, Liang [1 ,2 ]
Jiang, Jian-Tang [1 ]
Xu, Cheng-Yan [1 ,2 ]
Wang, Wen-Shou [1 ]
Shao, Wen-Zhu [1 ]
机构
[1] Harbin Inst Technol, Sch Mat Sci & Engn, Harbin 150001, Peoples R China
[2] Harbin Inst Technol, MOE Key Lab Microsyst & Microstruct Mfg, Harbin 150001, Peoples R China
关键词
LARGE-SCALE SYNTHESIS; OXIDE NANOTUBES; HOLLOW; NANOSTRUCTURES; NANOCOMPOSITES; PERMITTIVITY; MICROSPHERES; PERMEABILITY; ENHANCEMENT; FREQUENCIES;
D O I
10.1039/c1ce05397c
中图分类号
O6 [化学];
学科分类号
0703 ;
摘要
Fe-ferrite composite nanotubes were successfully prepared by thermal hydrogen reduction of alpha-FeOOH nanowires. The nanotubes have diameters of about 100 nm and lengths of tens of micrometres. The formation mechanism of Fe-ferrite composite nanotubes is discussed, and the non-equilibrium diffusion between hydrogen and oxygen was found to be responsible for the formation of the hollow interior structure. Because of the high shape anisotropy of the 1-D shape, the coercivity of composite nanotubes was higher than that of reported granular Fe-ferrite composite nanoparticles. Since the eddy current is effectively suppressed by the thin wall characteristic of nanotubes, the composite nanotubes exhibit higher permeability than that of the reported ferromagnetic metal nanowires. Due to the better impedance matching and higher dissipation efficiency, a superior microwave absorption performance was obtained in Fe-ferrite composite nanotubes, in which the maximum reflection loss is -18 dB and the effective absorption band (<-10 dB) covers the entire frequency band of 12.5-17.5 GHz.
引用
收藏
页码:6839 / 6844
页数:6
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