毕业论文--CdSe量子点及其核壳纳米晶的自组装

《毕业论文--CdSe量子点及其核壳纳米晶的自组装》由会员上传分享，免费在线阅读，更多相关内容在学术论文-天天文库。

1、济南大学毕业论文摘要本文用热注入法合成了CdSe量子点，然后分别用正硅酸乙酯(TEOS)和氨丙基三乙氧基硅烷(APS)作为修饰剂进行CdSe量子点的自组装，并用三辛基膦(TOP)作为配体制备了CdSe/ZnS量子点。通过X射线衍射仪、透射电子显微镜、荧光光谱仪、紫外可见近红外光谱仪等手段对制备样品进行了表征。结果表明：CdSe量子点的荧光发射峰波长随反应时间的延长而增大；其荧光强度随着放置时间的延长发生衰减，且荧光发射峰波长先发生红移后发生蓝移，说明这种方法制备的CdSe量子点不稳定。加入正硅酸乙酯(TEOS)和1μL氨丙基三乙氧基硅烷(APS)使CdSe量

2、子点发生了团聚，加入1.5μL氨丙基三乙氧基硅烷(APS)后CdSe量子点进行了自组装。以不同荧光发射峰波长的CdSe量子点为内核制备的CdSe/ZnS的波长随内核波长的增大而增大，且与内核波长相比均出现了红移，红移量随CdSe量子点波长的增大而减小，说明CdSe内核决定了其荧光性质，而ZnS外壳只起修饰和改善作用，并且ZnS层随CdSe量子点粒径的减小而变厚。关键词：CdSe；量子点；自组装；核壳纳米晶-42-济南大学毕业论文ABSTRACTInthisthesis,theCdSequantumdotsweresynthesizedbyhotinjecti

3、onsynthesis.tetraethylorthosilicate(TEOS)andaminopropyltriethoxysilane(APS)wereusedasmodifiersforself-assemblyofCdSequantumdotsrespectively.CdSe/ZnSquantumdotswereobtainedbyusingtrioctylphosphineastheligand.ThesamplespreparedwerecharacterizedbyXRD,TEM,fluorescencespectroscopeandUV-

4、Vis-NIRrecordingspectrophotometer.ItwasfoundthatthePLpeakwavelengthofCdSequantumdotsincreaseswiththeincreasingofthereactiontime;it'sPLintensitydecreasewiththeincreasingofstoretime.Atthesametime,thePLpeakwavelengthexhibitsaredshiftfirstandthenablueshiftoccurs.TheresultsindicatethatC

5、dSequantumdotspreparedbythissynthesisareunstable.Intheprocessofself-assemblyofCdSequantumdots,tetraethylorthosilicate(TEOS)or1μLofaminopropyltriethoxysilane(APS)causeagglomerationand1.5μLofaminopropyltriethoxysilane(APS)leadstoself-assembly.CdSequantumdotsofdifferentPLpeakwavelengt

6、hwereusedascorestosynthetizeCdSe/ZnSquantumdots.ThewavelengthofCdSe/ZnSincreaseswiththeincreaseofthewavelengthofCdSequantumdots,andthePLpeakwavelengthexhibitsaredshift.RedshiftdecreaseswiththeincreaseofCdSequantumdots'wavelength.TheresultsindicatethatCdSecoresdeterminefluorescencep

7、ropertiesofCdSe/ZnSandZnSshellonlyplaystheroleofmodificationandimprovement.Inaddition,ZnSshellbecomesthickwithdecreaseofthesizeofCdSequantumdots.Keywords：CdSe,quantumdots,self-assembly,core-shellstructure-42-济南大学毕业论文目录摘要IABSTRACTII1前言11.1量子点11.1.1量子点的基本特征11.1.2量子点的光学性质41.1.3量子点的应用4

8、1.1.4量子点材料61.2CdSe量子点71.2.