软模板水热法制备空心ZnFe2O4及吸波性能

Soft Template Hydrothermal Preparation and Absorbing Property of Hollow ZnFe2O4

摘要:

以六水合氯化铁和氯化锌为原料，聚乙二醇4000为表面活性剂，采用软模板水热法一步合成了具有空心结构的ZnFe2O4纳米颗粒。采用XRD、XPS、FE-SEM和TEM对样品的物相和形貌进行了表征，通过振动样品磁强计（VSM）和矢量网络分析仪测试了样品的静磁性能和电磁参数，并模拟计算了样品的反射损耗，考察了其吸波性能。结果表明：所制备的ZnFe2O4粒径约为100 nm，分散均匀，具有明显的空心结构。吸波性能优异。当样品的匹配厚度为2.7 mm时，在12.41GHz处获得最小的反射损耗（-42.18dB）；而当匹配厚度为3.0mm时，样品的有效吸收带宽（反射损耗≤-10dB，即吸收率为90%）最宽，为2.60GHz（10.60~13.20GHz）。

Abstract:

Using ferric chloride hexahydrateand zinc chloride as raw materials，and utilizing the self-assembly of polyethylene glycol 4000 as a surfactant, ZnFe2O4 nanoparticles with a hollow structure were synthesized in one step by a soft template hydrothermal method. The phase and morphology of the samples were characterized by XRD, XPS, FE-SEM and TEM, and the magnetic properties of the samples were investi-gated by vibrating sample magnetometer (VSM). A vector network analyzer was used to test the electro-magnetic parameters of the sample, and the reflection loss of the samples was calculated by simulation to study the absorbing performance of the sample. The results show that the as-prepared hollow ZnFe2O4 has a particle size of about 100 nm, is uniformly dispersed, and has a clear hollow structure. The absorbing properties are excellent, when the matched thickness of the sample is 2.7 mm, the minimum reflection loss(RL) at 12.41 GHz is up to -42.18dB; And when the matched thickness is 3.0 mm, the effective ab-sorption bandwidth( RL≤-10 dB,90% absorption rate) is 2.60 GHz (10.60GHz~13.20GHz).