通过热解二茂铁的工艺简便地制备了填充有α-Fe纳米线的碳纳米管(记为FCNT), 铁纳米线的长度在30～500nm之间. 碳纳米管的保护作用可以使铁纳米线的抗氧化能力得到提高, 测试了所得FCNT产物与石蜡组成的复合材料在2～18GHz频段的介电谱和磁谱,并计算和测试了其吸波性能.与普通碳纳米管相比,FCNT产物的介电常数实部和虚部均有较大提高; FCNT产物的磁导率实部也比普通碳纳米管高,但虚部值在2～13GHz频段略低; FCNT吸波涂层在频率为3.5和5.0GHz处分别有两个较强的吸收峰,其强度值分别为--3.9和--4.0dB, 表明这种新型吸收剂有望在2～4GHz频段实现对电磁波的有效吸收.
Carbon nanotubes filled with α-Fe nanowires (FCNT) was prepared conveniently by the
pyrolysis of ferrocene. The lengths of iron nanowires were in the range of 30--500nm.
Carbon nanotubes can protect inner iron nanowires from oxidation. After filling FCNT into paraffin wax to form a composite, both the permittivity and permeability in 2-- 18GHz of as-prepared composite samples were measured. Compared with pure carbon
nanotubes (MCNT), the real part, imaginary part of permittivity and the real part of permeability are improved remarkably. However, the imaginary part of permeability is lower than that of MCNT. There are two peaks of reflection loss for FCNT/epoxy coating at 3.5GHz and 5.0GHz, whose reflection loss values are --3.9dB and --4.0dB,
respectively. The results show that this novel absorber is promising to absorb microwave in 2--4GHz frequency effectively.
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