Mn掺杂ZnO稀磁半导体纳米晶的制备与表征的中期报告Thisisamid-termreportonthepreparationandcharacterizationofMn-dopedZnOmagneticsemiconductornanocrystals.Introduction:Magneticsemiconductorsarepromisingmaterialsforpotentialapplicationsinspintronics,magneticstoragedevices,magneticsensors,etc.DopingZnOwithmagneticionslikeMncanintroducemagneticbehaviorintothesemiconductor,makingitamagneticsemiconductor.Inthisproject,Mn-dopedZnOnanocrystalsaresynthesizedbyasol-gelmethod,andtheirstructural,optical,andmagneticpropertiesarecharacterized.Experimental:Zincacetatedihydrateandmanganeseacetatetetrahydratewereusedastheprecursors.Ethanolwasusedasthesolvent,anddiethanolamineandwaterwereusedasthestabilizers.Thesynthesisprocessinvolvedthefollowingsteps:(1)Dissolvingzincandmanganeseprecursorsinethanol;(2)Addingdiethanolamineandwatertothesolution;(3)Agingthesolutionatroomtemperaturefor24hours;(4)Dryingthegelat60°Cfor2hours;(5)Annealingthegelat600°Cfor2hoursunderanitrogenatmosphere.ThesynthesizedMn-dopedZnOnanocrystalswerethencharacterizedbyvarioustechniques:XRDforcrystalstructure,UV-Vis-NIRspectroscopyforopticalproperties,TEMformorphology,andSQUIDmagnetometerformagneticbehavior.ResultsandDiscussion:XRDanalysisshowedthatthesynthesizedMn-dopedZnOnanocrystalshadawurtzitecrystalstructure,withslightlatticeexpansionduetotheMnsubstitution.TEMimagesshowedthatthenanocrystalsweresphericalinshapeandhadanaveragesizeofaround20nm.UV-Vis-NIRspectroscopyshowedthattheopticalbandgapofthenanocrystalsdecreasedwithincreasingMndoping,indicatingthatMndopingincreasedthechargecarrierconcentration,leadingtothereductionofthebandgap.ThemagneticpropertiesoftheMn-dopedZnOnanocrystalsweremeasuredbySQUIDmagnetometer.Theresultsshowedthatthenanocrystalsexhibitedferromagneticbehavioratroomtemperature,withamagneticmomentofaround0.5emu/g.TheferromagnetismcanbeattributedtotheMndopants,whichintroducedlocalmagneticmomentstotheZnOlattice.Conclusion:Mn-dopedZnOnanocrystalsweresuccessfullysynthesizedbyasol-gelmethod,andtheirstructural,optic