纳米Fe3O4/凹凸棒石的制备及其吸波性能研究

摘要

The Fe3O4-attapulgite (Fe3O4-ATP) composite material was fabricated by a co-precipitation method and characterized by X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS), high-resolution transmission electron microscopy (HRTEM) and vector network analyzer. XRD and XPS characterized the phase of as-prepared sample and the oxidation state of iron bearing minerals, respectively. The HRTEM images revealed that the Fe3O4 magnetic parricles grew on the surface of the ATP needles which diameter distributes from 10 nm to 80 nm. The microwave absorption capacity of Fe3O4-ATP was measured in the frequency range of 2~18 GHz by a vector network analyzer. It can be seen that the optimal relfection loss (RL) of all the samples with different thickness are more than -13 dB and the biggest relfection loss (RL) could be about -28 dB at 12.6 GHz with a layer thickness of 3.5 mm. The results indicated that the ATP-Fe3O4 exhibited good microwave absorption capacity and could be used as a new type of absorber.%通过化学共沉积法制备纳米Fe3O4/凹凸棒石复合粉体，并采用XRD、XPS、HRTEM和矢量网络分析仪等手段对其微结构和吸波性能进行表征和分析。XRD和XPS分别证明了复合粉体的物相和铁的氧化价态。 HRTEM图像显示，Fe3O4磁性粒子均匀分布在凹凸棒石黏土表面，颗粒尺寸为10~80 nm。使用矢量网络分析仪在2~18 GHz范围测试不同厚度的Fe3O4/凹凸棒石的反射率。结果显示，不同厚度样品的峰值均超过-13 dB，其中厚度为3.5 mm的样品在12.6 GHz处反射峰为-28 dB，说明Fe3O4/凹凸棒石具有优良的吸波性能，有望成为一种新型的吸波材料。