过渡族金属氧化物纳米线阵列的发光性质研究

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1、兰州大学硕士学位论文过渡族金属氧化物纳米线阵列的发光性质研究姓名：龚育申请学位级别：硕士专业：凝聚态物理指导教师：薛德胜20070501龚育兰州大学硕士学位论文AbstractInrecentyears，one—dimensionalnanomaterialshavebeenattractedmuchattentionduetotheirsuperiorelectrical，optical，magnetic，mechanicalandthermalproperties，aswellastheirpotentia

2、lapplicationinnanodevices，sensors，andlasers，andtheyareexpectedtoshowmanyinterestingpropertiesoriginatingfromthelowdimensionalityandthequantumfluctuations．Thelossesofmanykindsofeffectsuchasopticalabsorption,reflectivityandtransitionarecloselyrelatedtothesizee

3、ffectofthenanomaterials．Forexample，opticalfiberrepresentsanimportantroleintheareaofcommunicationandopticaltransmission．Whentheopticalfiberstakeadvantageofnanomaterials，thelosseswillbesignificantlyloweddownandtheefficiencyoftheligbtUausmissionwillbeimprovedgr

4、eatly．Becauseoftheirdistinguishpropertiessuchassemi-conductivityandmagneticproperty,transitionmetaloxidemnomaterialsattractmuchattentionamongthenanoscienceandnanotechnologyarea．Somemaincontentsandinnovationsinthispaperarelistedasbelow：1．Large—scaleZnOnanowir

5、earraysaresynthesizedbyelectrodepositionwithstlbsequentheat-treatmentinatmosphereambientat450-650。C．FieldEmissionScanningElectronicMicroscopeandTransmissionElectronMicroscoperesultsshowthatthelengthofZnOnanowiresisnearly5Bmandtheirdiameterisabout70Bill．X-ray

6、diffractionandelectrondiffractionresultsrevealthattheZnOnanowireisapolyerystallinestructure．Photoluminescenceisinvestigatedat295K．AbnormalPLpropertiesthatanunusualsharpemissionat485nnlandabroadultravioletemissionwhicharedifferentfromtheotherPhotoluminescence

7、workofzn0beforeareobserved．111epossibleexplanationofallthedistinctresultswasdiscussed．AndwefeelthatthesharpnessoftheblueemissionmaybevaluableforthefutureapplicationsofZnOnano．1aserdevices．2．C0304nanowirearrayswerefabricatedbyelectrodepositionwithfollowinghea

8、t-treatmentinatmosphereambient．Photoluminescencewasinvestigatedat295K．Intheexperiment,whenincreasingtheexcitationlightwavelengthfrom260to360nm,twokindsofemissionscorrespondingtotheincreasingexci