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一维钴纳米材料的简单制备及其磁性和电磁性能研究（英文）.docx

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一维钴纳米材料的简单制备及其磁性和电磁性能研究（英文） One-DimensionalCobaltNanomaterials:ASimpleSynthesisandInvestigationoftheirMagneticandElectromagneticProperties Cobaltisamagnetictransitionmetalthathasattractedsignificantattentioninrecentyearsforitspotentialapplicationsinvariousfields,includingmagneto-electronicdevices,catalysts,andbiomedicalapplications.One-dimensional(1D)cobaltnanomaterialshavebeenextensivelystudiedduetotheiruniquephysicalandchemicalproperties,whichmakethemsuitableforvariousapplications.Thispaperpresentsasimpleyeteffectivemethodforthesynthesisof1Dcobaltnanomaterialsandinvestigatestheirmagneticandelectromagneticproperties. Thesynthesisof1Dcobaltnanomaterialswascarriedoutusingasolvothermalmethod.Cobaltacetatetetrahydratewasusedasthestartingmaterial,andpolyvinylpyrrolidone(PVP)wasusedasasurfactant.Ethyleneglycolwasusedasasolvent,andthereactionwascarriedoutat200°Cfor24hours.Theresultingproductwaswashedseveraltimeswithethanolanddriedundervacuum. Themorphologyandstructureofthesynthesizedcobaltnanomaterialswereinvestigatedusingtransmissionelectronmicroscopy(TEM)andX-raydiffraction(XRD).TEMimagesshowedthatthecobaltnanomaterialswerehighlyuniforminsizeandshape,withanaveragediameterof50nmandalengthofseveralmicrons.XRDanalysisconfirmedthatthesynthesizedcobaltnanomaterialswerepureandhighlycrystallinewithaface-centeredcubic(FCC)crystalstructure. Themagneticpropertiesofthecobaltnanomaterialswereinvestigatedusingavibratingsamplemagnetometer(VSM)atroomtemperature.Theresultsshowedthatthecobaltnanomaterialsexhibitedsuperparamagneticbehaviorwithasaturationmagnetization(Ms)of65emu/gandacoercivity(Hc)of0.5Oe.ThehighMsvalueindicatedastrongmagneticresponse,whilethelowHcvaluesuggestedthatthecobaltnanomaterialshadalowenergybarrierformagnetizationreversal. Theelectromagneticpropertiesofthecobaltnanomaterialswereinvestigatedusingavectornetworkanalyzer(VNA)inthefrequencyrangeof8-12GHz.Thecobaltnanomaterialsexhibitedexcellentmicrowaveabsorptionproperties,withamaximumreflectionloss(RL)of-29dBatafrequ