铝基模板沉积fe纳米线阵列及其微波吸收性能研究

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1、中南大学硕士学位论文摘要纳米吸波材料是吸波隐身材料的发展方向。利用铝基阳极氧化多孔膜板电沉积过程首次制成了铝基磁性纳米线阵列复合吸波材料，避免纳米线间缠绕导通，充分发挥其纳米效应，吸波性能优异，有重大应用价值。本文从理论上研究了铁磁性纤维及其吸波材料的电磁参数和吸波性能的变化规律。分析计算表明：减小直径及增大长径比是提高轴向和径向磁导率及介电常数的有效途径；定向排列能提高铁纤维磁损耗及介电损耗；吸波材料的等效电磁参数随纤维吸收剂的含量和长径比的增大而增大，随纤维直径的减小而增大。通过改变阳极氧化和扩孔处理条件制备了不同孔径和厚

2、度的铝基多孔氧化铝(AAO)模板，并在铝基AAO模板上沉积了不同直径、长径比及含量的Fe纳米线阵列。结果表明，纳米线大小一致，相互平行且直径和长径比可在一定范围内任意调节。Fe纳米线阵列吸波性能的测试结果表明，反射率与表面电阻成反比；减小直径显著提高了吸波性能，特别是高频波段的吸波性能。磁性铁纳米线阵列优异的高频吸波性能可能来源于纳米效应和共振效应。关键词微波吸收性能，纳米线阵列，阳极氧化，电沉积，等效复电磁参数ABSTRACTMicrowave-absorbingnanomaterialsisthedevelopingrad

3、arabsorbingmaterials．Microwave-absorbingaluminumbasecompositeswithmagneticironnanowirearrayweresuccessfullypreparedbyelectrochemicaldepositionintheporousanodicaluminumoxidetemplateonaluminumbase，Thenarlowirearrayinthealuminumoxidetemplatecanpreventtheelectroniccondu

4、ctionbetweennanowires，andexertalladvantagesofnanowiresinradarabsorbing．Thealuminumbasecompositeswithironnanowirearrayshowedexcellentmicrowaveabsorbingpropertiesandimportantpromisinginapplication．Intheory,electromagneticparametersandmicrowaveabsorbingpropertiesofiron

5、magneticfiberandradarabsorbingmaterialswithironmagneticfiberswerestudied，andthederivedmodelswerenumericallyanalyzed．Decreasingthediameteroffiberandincreasingthelength-diameterratiooffiberCanincreasetheaxial(radial)permeabilityandtheaxial(radial)permittivity,anddirec

6、tionalaligningofthefibersCallenhancethemagneticlossandthedieleciricloss．Theeffective·electromagneticparametersoftheabsorbingmaterialsincreasealongwiththeincreaseofthefiberabsorbentcontent。theincreaseofthefiberlength-diameterratioofthecompositeabsorbingmaterialsandth

7、edecreaseofthediameteroffiber．Thealuminumbaseporousanodicaluminumoxidetemplateswiththedifferentdiameterandlength·diameterrationanoporewerepreparedbychangingtheconditionofanodizationandholeenlargingtreatment．Themagneticironnanowirearrayswerefabricatedbyelectrochemica

8、ldepositionintotheporespaceofthetemplate．Thenanowiresinthearraywerethesanleindiameterandparalleleachother．Thediameterandratioofthenanowire