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1、南京航空航天大学硕士学位论文宽禁带纳米半导体材料制备及其光学性能研究姓名：咸小刚申请学位级别：硕士专业：应用化学指导教师：郭万林20090301宽禁带纳米半导体材料制备及其光学性能研究AbstractBecauseofitsexcellentoptical,electricalproperties,TiO2nano-materialshavebeenwidelyusedinphotovoltaicconversion,electrochromicwindows,solarcells,andphotocatalysis.Wide-b
2、andgapoxidesemiconductorZnOhasexcellentopticalpropertiesfrombluetoultraviolet.Afterdopedwithmagneticmaterials,itexpectedtobemadeupofthemagneto-opticaldevices.Thequalityoftheseperformancesinfluencedtoalargeextentbythemethodofpreparation,post-processingtechniquesandthed
3、opedelements.Therefore,thisarticlewillexplorethechangesintheperformanceatdifferentconditions.(1)ThePreparationandCharacterizationofNano-TiO2thinfilms.Inthestudiesofnano-titaniumdioxidefilmatroomtemperature,weusetetrabutyltitanateforprecursor,nitricacidasastabilizerand
4、thecatalyst,ethanolasasolventanddispersingagent.TheTiO2thinfilmswithdifferentthicknessbetween40and340nmhadbeenpreparedviaasol-gelmethodanddippedwiththesubstrateofquartz.Weusefieldemissionscanningelectronmicroscopeandatomicforcemicroscopytogetthemorphologyofthefilm.Ana
5、lysethecrystalbyX-raydiffractionandRamanspectroscopy.Thendiscusstheluminousintensityundertheinfluenceofdifferentthicknessfilms.(2)Two-stepHydrothermalSynthesisofZnSnano-materialsandtheiropticalproperties.ZnSisadirectwidebandgapsemiconductormaterial,andhasgoodopticalpe
6、rformance.Soitwaswidelyusedindisplays,sensors,lasersandcatalyst.Inthispaperweuseanewsyntheticmethodthatisthetwo-stephydrothermalsynthesis.FromtheXRDandRamanspectrawecandrawthatthesecondstepofthereactionmaygetthesulfur-dopedZnOandZnSnano-materialswhichoxygenwaslargelyr
7、eplacedbysulfur.Andthengivethegrowthmechanismofthischange.OpticalresearchfoundthattheluminescenceismainlyduetothedefectofZnS.Photoluminescencepeakstrengthenhancedobviouslyandchangedbysulfur-doped.Keywords:Sol-Gelmethod,Hydro-thermal,Two-stepSynthesis,Titaniumdioxide,Z
8、incOxide,Zincsulphide,Film,Nanowires,PhotoluminescenceII南京航空航天大学硕士学位论文图表清单图1.1不同维度下的纳米材料....................................
