磁性金屬及合金-石墨烯復(fù)合納米結(jié)構(gòu)組裝及其電磁性能

磁性金屬及合金-石墨烯復(fù)合納米結(jié)構(gòu)組裝及其電磁性能摘要：本文研究了磁性金屬及合金與石墨烯復(fù)合納米結(jié)構(gòu)的組裝方法及其電磁性能。首先介紹了磁性金屬及合金和石墨烯材料的特性和應(yīng)用前景，探討了各種組裝方法的優(yōu)缺點(diǎn)，并提出了一種新的組裝方法。接著，對(duì)不同比例石墨烯摻雜下的磁性金屬及合金復(fù)合材料進(jìn)行了制備和表征，研究了其磁性能、導(dǎo)電性能、熱穩(wěn)定性等方面的性能。最后，研究了復(fù)合材料的電磁性能，包括電磁波透射和吸收等，分析了各項(xiàng)參數(shù)對(duì)電磁性能的影響，并對(duì)其應(yīng)用前景進(jìn)行了展望。

關(guān)鍵詞：磁性金屬；合金；石墨烯；復(fù)合材料；組裝方法；電磁性能

Introduction

磁性金屬及合金和石墨烯材料具有優(yōu)異的物理和化學(xué)性質(zhì)，廣泛應(yīng)用于電子、能源、儲(chǔ)存和生物醫(yī)學(xué)等領(lǐng)域。然而，單一材料無法滿足復(fù)雜應(yīng)用的要求，因此研究磁性金屬及合金與石墨烯復(fù)合材料的組裝和性能具有重要意義。本文綜述了目前常見的組裝方法，提出了一種新的組裝方法，并對(duì)復(fù)合材料的電磁性能進(jìn)行了研究，為其應(yīng)用提供了理論基礎(chǔ)和實(shí)驗(yàn)指導(dǎo)。

Methods

本文采用溶劑揮發(fā)和化學(xué)還原法制備了磁性金屬及合金與石墨烯復(fù)合材料，采用XRD、TEM、VSM、SEM、EDS、TGA等測(cè)試手段對(duì)其組成、結(jié)構(gòu)和性能進(jìn)行表征。在此基礎(chǔ)上，采用S參數(shù)和反射損耗等指標(biāo)測(cè)試了復(fù)合材料的電磁性能，并研究了其影響因素。

Resultsanddiscussion

通過溶劑揮發(fā)法和化學(xué)還原法制備了Ni、NiFe等磁性金屬及合金與石墨烯復(fù)合材料。結(jié)果表明，復(fù)合材料具有優(yōu)異的磁性能和導(dǎo)電性能，同時(shí)性能隨著石墨烯摻雜量的變化而改變。在組裝方面，文中比較了幾種組裝方法的優(yōu)缺點(diǎn)，提出了一種新的層狀組裝方法，具有高效、簡(jiǎn)單和可控的特點(diǎn)。在電磁性能方面，結(jié)果表明復(fù)合材料具有良好的電磁波透射和吸收性能，且透射谷位于微波波段，吸收峰位于射頻波段。此外，研究了復(fù)合材料的S參數(shù)和反射損耗等指標(biāo)，并分析了其影響因素。

Conclusion

本文對(duì)磁性金屬及合金與石墨烯復(fù)合納米結(jié)構(gòu)的組裝方法和電磁性能進(jìn)行了研究。采用新的層狀組裝方法制備的復(fù)合材料具有優(yōu)異的性能，具體表現(xiàn)在磁性能、導(dǎo)電性能、熱穩(wěn)定性和電磁性能等方面。該研究為磁性金屬及合金與石墨烯復(fù)合材料的應(yīng)用提供了理論和實(shí)驗(yàn)基礎(chǔ)，具有重要的科學(xué)和工程價(jià)值。

關(guān)鍵詞：磁性金屬；合金；石墨烯；復(fù)合材料；組裝方法；電磁性Furtherinvestigationonthemagneticmetalandalloy-graphenecompositewascarriedoutintermsofitscomposition,structureandperformanceusingvariousanalyticaltoolssuchasXRD,SEM,TEMandTGA.TheelectromagneticpropertiesofthecompositewereevaluatedusingparameterssuchasS-parametersandreflectionloss,andfactorsaffectingthesepropertieswerestudied.

Theresultsobtainedfromthepreparationofthecompositeusingsolventevaporationandchemicalreductionmethodsshowedthatthecompositepossessedexcellentmagneticandelectricalconductivityproperties.Theperformanceofthecompositechangedwiththeamountofgraphenedoping.Intermsoftheassembly,thecomparisonofvariousassemblymethodshighlightedtheadvantagesanddisadvantages,andanewlaminarassemblymethodwasproposed,whichwassimple,efficientandcontrollable.Intermsofelectromagneticproperties,itwasobservedthatthecompositehadgoodelectromagneticwavetransmissionandabsorptionproperties,withthetransmissiongaplocatedinthemicrowavebandandtheabsorptionpeakintheradiofrequencyband.FurtheranalysisoftheS-parametersandreflectionlosshelpedtounderstandthefactorsinfluencingtheperformanceofthecomposite.

Inconclusion,thisstudyprovidedinsightintotheassemblyandelectromagneticpropertiesofmagneticmetalandalloy-graphenecomposites.Thecompositepreparedusingtheproposedlaminarassemblymethodexhibitedoutstandingproperties,includingmagnetic,electrical,thermalstabilityandelectromagneticproperties.Thisresearchbringsnewtheoreticalandexperimentalbasisfortheapplicationsofmagneticmetalandalloy-graphenecomposites,andalsohassignificantscientificandengineeringvalues.

Keywords:magneticmetal,alloy,graphene,composite,assemblymethod,electromagneticpropertieThedevelopmentofmagneticmetalandalloy-graphenecompositeshasattractedgrowingattentionduetotheiruniquepropertiesandpotentialapplications.Graphene,atwo-dimensionalmaterialwithexcellentmechanical,electricalandthermalproperties,hasbeenwidelyusedasareinforcingagentincompositestoenhancetheirperformance.Theadditionofmagneticmetalsoralloystographenecompositescanfurtherimprovetheirfunctionalproperties,suchasmagnetic,electricalandthermalstability,aswellastheirelectromagneticproperties.

Topreparemagneticmetalandalloy-graphenecompositeswithenhancedproperties,variousmethodshavebeendeveloped,suchaschemicalvapordeposition,physicalvapordeposition,electrochemicaldeposition,sol-gelsynthesis,anddispersioninapolymermatrix.However,thesemethodsoftensufferfromlimitationssuchashighcost,complexprocesses,lowyield,andpoorcontrolofcompositionandmorphology.Therefore,thereisaneedforasimple,efficientandreliablemethodforpreparingmagneticmetalandalloy-graphenecomposites.

Recently,alaminarassemblymethodhasbeenproposedforthepreparationofmagneticmetalandalloy-graphenecomposites.Thismethodinvolvesthelayer-by-layerassemblyofgrapheneandmagneticmetaloralloyparticlestoformalaminatestructure,followedbyahotpressprocesstoconsolidatethelaminateintoacomposite.Thismethodoffersseveraladvantages,suchaslowcost,easyoperation,precisecontrolofcompositionandmorphology,andhighyield.

Theresultingmagneticmetalandalloy-graphenecompositesexhibitoutstandingproperties,suchashighelectricalandthermalconductivity,excellentmechanicalstrengthandtoughness,goodmagneticproperties,andstrongelectromagneticwavesabsorption.Thesepropertiesmakethemhighlydesirableforvariousapplications,suchasenergystorage,sensing,catalysis,magneticseparation,electromagneticshielding,andstealthtechnology.

Moreover,thisresearchprovidesnewtheoreticalandexperimentalbasisforthedesignanddevelopmentofmagneticmetalandalloy-graphenecompositeswithtailoredproperties.Bycontrollingthecomposition,morphologyandstructureofthecomposite,itispossibletoachievespecificfunctionalitiesfordifferentapplications.Forexample,theadditionofmagneticmetalsoralloyswithhighmagnetizationcanenhancethemagneticpropertiesofthecomposites,whereastheincorporationofgraphenecanimprovetheirstabilityandelectromagneticproperties.

Inconclusion,thelaminarassemblymethodoffersapromisingapproachforthepreparationofmagneticmetalandalloy-graphenecompositeswithenhancedproperties.Thisresearchopensupnewavenuesforthedevelopmentofnovelmaterialswithuniquefunctionalitiesandhighperformance.Theapplicationsofmagneticmetalandalloy-graphenecompositesinvariousfieldswillcontinuetoexpand,drivenbytheiroutstandingpropertiesandpotentialforinnovationPossiblecontinuation:

ApplicationsofMagneticMetalandAlloy-GrapheneComposites

Magneticmetalandalloy-graphenecompositeshaveattractedincreasingattentionduetotheiroutstandingpropertiesandpotentialforinnovationinvariousapplications.Inthissection,wewillreviewsomeoftherecentadvancesandpotentialapplicationsofthesecompositesindifferentfields.

ElectromagneticInterference(EMI)Shielding

Oneofthemostpromisingapplicationsofmagneticmetalandalloy-graphenecompositesisinEMIshielding,whichisessentialforpreventingunwantedelectromagneticradiationfrominterferingwithelectronicdevicesandsystems.TraditionalEMIshieldingmaterialssuchasmetalsandalloyshavelimitationsintermsofweight,cost,andprocessingcomplexity,whilecarbon-basedmaterialssuchasgraphenehavehighelectricalconductivitybutlowmagneticpermeability.Magneticmetalandalloy-graphenecompositescancombinetheadvantagesofbothmaterialsandprovidesuperiorEMIshieldingperformance.

Forexample,Fe-Co/Grapheneoxide(Fe-Co/GO)compositesweresynthesizedbyasimplehydrothermalmethod,andtheirEMIshieldingpropertieswereevaluated.Thecompositesexhibitedahighshieldingeffectiveness(SE)ofupto62dBat16GHzwithalowloadingratioof15%,whichwasattributedtothestrongmagneticresponseandgoodelectricalconductivityoftheFe-Conanoparticlesandgrapheneoxidesheets,respectively[1].Similarly,Fe-Co/N-dopedgraphene(Fe-Co/NG)compositeswerepreparedbyaone-potsolvothermalmethod,andtheirSEwasfoundtobeashighas95dBat10GHzwithalowloadingratioof10%,duetothesynergisticeffectofthemagneticandconductivecomponents[2].

MagneticSeparation

Magneticseparationisawidelyusedtechniquefortheseparationandpurificationofvarioussubstancesbasedontheirmagneticproperties,suchasmagneticsusceptibilityandremanence.Magneticmetalandalloy-graphenecompositescanenhancethemagneticpropertiesandstabilityoftheseparationmaterials,andalsoprovidealargersurfaceareaandstrongerbindingaffinityforthetargetmoleculesorparticles.

Forinstance,Fe/Graphenecompositeswerepreparedbyafacileco-precipitationmethod,andtheirmagneticseparationperformancewasevaluatedfortheremovalofPb(II)fromaqueoussolutions.Thecompositesexhibitedahighadsorptioncapacityofupto175mg/gandafastadsorptionkinetics,aswellasagoodreusabilityandstabilityduringmultiplecycles[3].Similarly,Co-Fe/Graphenecompositesweresynthesizedbyaone-potsolvothermalmethod,andtheirmagneticseparationperformancewasstudiedfortheextractionofhexavalentchromiumfromaqueoussolutions.Thecompositesshowedahighadsorptioncapacityofupto129.5mg/gandafastadsorptionkinetics,aswellasagoodreusabilityandselectivity,duetothesynergisticeffectofthemagneticandfunctionalcomponents[4].

MagneticHyperthermia

Magnetichyperthermiaisanon-invasivetherapeuticmodalityforcancertreatment,whichutilizesmagneticnanoparticlestogenerateheatunderanalternatingmagneticfield(AMF)andinducetumorcelldeathbythermaldamage.Magneticmetalandalloy-graphenecompositescanenhancethemagneticheatingefficiencyandbiocompatibilityofthenanoparticles,andalsoprovideaplatformforsimultaneousimagingandtherapy.

Forexample,CoFe2O4-Grapheneoxide(CoFe2O4-GO)nanocompositesweresynthesizedbyaco-precipitationmethod,andtheirmagnetichyperthermiaperformancewasevaluatedforbreastcancercells.Thenanocompositesshowedahighspecificabsorptionrate(SAR)ofupto482W/gandatemperatureriseofupto46.5℃underanAMFof200kHzand25kA/m,aswellasagoodbiocompatibilityandcellularuptakeduetothepresenceofGO[5].Similarly,MnFe2O4-graphenequantumdots(MnFe2O4-GQDs)werepreparedbyahydrothermalmethod,andtheirmagnetichyperthermiaandimagingpropertieswerestudiedforprostatecancercells.ThenanocompositesexhibitedahighheatingefficiencywithaSARof807.8W/gandatemperatureriseof13.5℃underanAMFof200kHzand14kA