zno微纳米结构的可控制备、生长机理与性能分析

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1、ABSTRACTAsanimportantlow-costsemiconductorfunctionalmaterialwithlargebandgap(3．37eV)andlargeexcitationbindingenergy(60meV)，zincoxide(ZnO)isrecognizedaSoneofthemostpromisingmaterialsforoptoelectronicapplications．NanostructuredZnOhaSdrawnconsiderableattentionduetoitsunique

2、electrical，mechanical，andopticalproperties，inadditiontoitsapplicationsinnumerousfields，suchassolarcells，gaSsensors，piezoelectricmaterials，photoniccrystals，andoptoelectricdevices．However,therearestillthreebasicquestionsoftheZnOnanomaterial：firstly,thespecificsurfaceareaof

3、nanoZnOmaterialsarelow；Secondly,thecontrollablepreparationoforderlynanoarrayisdifficult，andtheelectron-holerecombinationrateishighindisorderedstructures，whichleadtoalowphotoelectricalconversion．Thirdly,themechanismoftheformationofthenanostructureisstillnotclear．Asaresult

4、，thereisofgreatsignificancetostudythepreparationofhighspecificsurfacearea．Inthiswork，one—dimensionalandthree—dimensionaldifferentmorphologiesZnOnanostructurehavebeensuccessfullypreparedbyasimplehydrothermalmethod，andthemainrearchworkandresultswereaSfollowing．WithZn(N03)2

5、andC6H12N4aSrawmaterial，theorderlyZnOnanorodarrayhaSbeensuccessfullypreparedbycontrollingtheprecursorconcentrationandreactiontime．TheresultsdemonstratedthattheoptimumconditionofpivotalcraftworkoftheZnOnanorodsarray：precursorconcentrationisO．02mol／L．thereactiontimeis4h．Du

6、etothethinstructureandroughsurfacewhichCanabsorbmoredyesandmorereactivecenter,theZnOnanorodsarraypreparedatthisoptimumconditionshowsthebestphotoelectricperformance．TheThree·-dimensionalseaurchinZnOmicro·-nanostructurewasfirstsuccessfullypreparetedbyhydrothermalmethodinZn

7、(Y03)2一NH3，withFTOconductiveglassaSthebase．TheZnOmicro—nanostructurecrystalissinglecrystalstructure，thelatticedistance(0001)isabout0．26nln．WeCanprepareThree-dimensionalseaurchinZnOmicro—nanostructurebycontrollingthereactiontemperature，reactiontimeandpHvalue．Andtheresults

8、IIIdemonstratedthattheoptimumconditionofpivotalcraftworkoftheZnOnanorodsarray：s：pHvalueis9，thereactiont