铁氧体/聚吡咯和镍/硫化锌磁性复合材料的制备与表征
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摘要
核壳纳米材料的制备受到了很大的关注,因为可通过调整成分或者颗粒大小来改变其物化性能。在查阅大量文献的基础上,对核壳结构材料的合成方法进行了研究,并取得了如下成果：
(1)采用原位聚合法合成了ZnFe2O4/PPy纳米材料且其壳层厚度可通过添加不同的吡咯量加以控制。复合材料的饱和磁化强度和矫顽力分别为17.8 emu/g和130 Oe。复合材料电磁表征表明,由于其复介电常数和复磁常数良好的匹配,复合材料具有优异的吸波性能。
(2)在Fe304表面氧化吡咯单体成功的制备了Fe3O4/PPy纳米材料。研究表明核颗粒大小约为100 nm,壳层厚度约为70 nm。复合材料的饱和磁化强度和矫顽力分别为20.1 emu/g和368.3 Oe。当样品厚度为2.3 mm时,复合材料具有最佳的微波反射损失-22.4dB,其反射损失小于-10 dB的波段有5 GHz。良好的微波吸收性能可能是由于其特殊的核壳微观结构。
(3)Ni/ZnS纳米材料是通过两步法合成的,首先是Ni纳米颗粒制备以及ZnS沉积在Ni颗粒表面。Ni颗粒的直径大约为80-130 nm,ZnS的大小约为30-50 nm。和纯的Ni颗粒相比,复合材料的磁性能明显降低可能是由于非磁性材料的包覆。由于包覆前后颗粒大小和形貌的改变使得Ni/ZnS纳米材料的最大激发峰出现红移。
Recently, there has been a great deal of interest in the fabrication of core/shell nanocomposite materials, because the physical and chemical properties can be tuned by controlling their compositions and the relative sizes of the core and shell.Based on the previous studies, I succeeded to synthesize the core/shell nanocomposites.
(1) ZnFe2O4/PPy nanoparticles could be facilely synthesized and the shell thickness could be controlled by adjusting the amount of pyrrole monomers.Magnetic studies revealed that the saturation magnetization and coercivity of ZnFe2O4/PPy nanoparticles is 17.8 emu/g and 130 Oe, respectively. The electromagnetic characteristics showed that ZnFe2O4/PPy nanoparticles exhibit excellent microwave absorption performance, such as more powerful absorbing property and wider electromagnetic wave absorbing frequency band due to the proper matching of the permittivity and the permeability.
(2) Fe3O4/PPy nanocomposites were prepared by chemical oxidative polymerization of pyrrole monomers on the surface of Fe3O4 nanoparticles.Studies indicate that typical nanocomposites consist of Fe3O4 with 100 nm diameters and adjacent PPy with a thickness of about 70 nm.Fe3O4/PPy nanocomposites exhibit a saturated magnetization of 20.1 emu/g and covercivity value of 368.3 Oe, respectively. The value of the minimum reflection loss is-22.4 dB at 12.9 GHz for nanocomposites with a thickness of 2.3 mm and a broad peak with a bandwidth lower than-10 dB is of about 5 GHz.Such strong absorption is attributed to better electromagnetic matching due to the existence of PPy and its special core/shell microstructure.
(3)Ni/ZnS nanocomposites were prepared via a two-step approach with an initial synthesis of Ni nanoparticles and then as templates for the deposition of ZnS nanoparticles.Studies indicate that typical nanocomposites consist of Ni with 80-130 nm diameter and adjacent ZnS with a thickness of about 30-50 nm. The value of magnetization saturation significantly decreases as a result of the nonmagnetic coating affecting. The emission spectrum shows a small red shift as compared with that of pure ZnS.The possible reason may be ascribed to the change of size, morphology and crystallinity of ZnS sample after coating.
(1)采用原位聚合法合成了ZnFe2O4/PPy纳米材料且其壳层厚度可通过添加不同的吡咯量加以控制。复合材料的饱和磁化强度和矫顽力分别为17.8 emu/g和130 Oe。复合材料电磁表征表明,由于其复介电常数和复磁常数良好的匹配,复合材料具有优异的吸波性能。
(2)在Fe304表面氧化吡咯单体成功的制备了Fe3O4/PPy纳米材料。研究表明核颗粒大小约为100 nm,壳层厚度约为70 nm。复合材料的饱和磁化强度和矫顽力分别为20.1 emu/g和368.3 Oe。当样品厚度为2.3 mm时,复合材料具有最佳的微波反射损失-22.4dB,其反射损失小于-10 dB的波段有5 GHz。良好的微波吸收性能可能是由于其特殊的核壳微观结构。
(3)Ni/ZnS纳米材料是通过两步法合成的,首先是Ni纳米颗粒制备以及ZnS沉积在Ni颗粒表面。Ni颗粒的直径大约为80-130 nm,ZnS的大小约为30-50 nm。和纯的Ni颗粒相比,复合材料的磁性能明显降低可能是由于非磁性材料的包覆。由于包覆前后颗粒大小和形貌的改变使得Ni/ZnS纳米材料的最大激发峰出现红移。
Recently, there has been a great deal of interest in the fabrication of core/shell nanocomposite materials, because the physical and chemical properties can be tuned by controlling their compositions and the relative sizes of the core and shell.Based on the previous studies, I succeeded to synthesize the core/shell nanocomposites.
(1) ZnFe2O4/PPy nanoparticles could be facilely synthesized and the shell thickness could be controlled by adjusting the amount of pyrrole monomers.Magnetic studies revealed that the saturation magnetization and coercivity of ZnFe2O4/PPy nanoparticles is 17.8 emu/g and 130 Oe, respectively. The electromagnetic characteristics showed that ZnFe2O4/PPy nanoparticles exhibit excellent microwave absorption performance, such as more powerful absorbing property and wider electromagnetic wave absorbing frequency band due to the proper matching of the permittivity and the permeability.
(2) Fe3O4/PPy nanocomposites were prepared by chemical oxidative polymerization of pyrrole monomers on the surface of Fe3O4 nanoparticles.Studies indicate that typical nanocomposites consist of Fe3O4 with 100 nm diameters and adjacent PPy with a thickness of about 70 nm.Fe3O4/PPy nanocomposites exhibit a saturated magnetization of 20.1 emu/g and covercivity value of 368.3 Oe, respectively. The value of the minimum reflection loss is-22.4 dB at 12.9 GHz for nanocomposites with a thickness of 2.3 mm and a broad peak with a bandwidth lower than-10 dB is of about 5 GHz.Such strong absorption is attributed to better electromagnetic matching due to the existence of PPy and its special core/shell microstructure.
(3)Ni/ZnS nanocomposites were prepared via a two-step approach with an initial synthesis of Ni nanoparticles and then as templates for the deposition of ZnS nanoparticles.Studies indicate that typical nanocomposites consist of Ni with 80-130 nm diameter and adjacent ZnS with a thickness of about 30-50 nm. The value of magnetization saturation significantly decreases as a result of the nonmagnetic coating affecting. The emission spectrum shows a small red shift as compared with that of pure ZnS.The possible reason may be ascribed to the change of size, morphology and crystallinity of ZnS sample after coating.
引文
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