Sn掺杂ZnO纳米阵列的水热合成

西安建筑科技大学课程设计(论文)西安建筑科技大学课程设计(论文)西安建筑科技大学课程设计（论文）西安建筑科技大学课程设计（论文）Sn掺杂ZnO纳米阵列的水热合成摘要:以ZnCl2和NaOH为原料，用SnCl4-4H2O作掺杂剂，通过水热法合成了5口掺杂ZnO纳米颗粒。利用X射线衍射(XRD)、场发射扫描电镜(FE-SEM)、紫外-可见吸收光谱(UV-Vis)及光致发光(PL)光谱等测试技术对样品的物相、形貌及光学性能进行了表征。结果表明:制得的Sn掺杂ZnO纳米粒子具有六角纤锌矿结构。随着锡掺杂浓度的增大，纳米晶的平均粒度增加，晶体形貌由短棒状向单锥和双锥状变;提高前驱液的pH值，所得样品的形貌由长柱状向短柱状转变。室温下，观测到三个光致发光带一个峰值在433nm处的强紫光发射峰，一个约在401nm处的近紫外发光峰及一个^66nm处的弱蓝光发光峰。在实验掺杂浓度范围内，Sn的掺杂致使改变纳米ZnO的发光强度，对发光峰位置影响不大。关键词：ZnO纳米晶;水热合成;Sn掺杂;光学性能Abstract:HydrothermalsynthesisofSndoped

ZnOnanoarrayAbstract:Sn-dopedZnOnanocrystalsweresynthesizedbythehydrothermalmethodusingZnCl2andNaOHasrawmaterialsat200efor5h.ThedopantsourceoftinwasSnCl4・4H2Oandtheatomicpercentageofdopantinthesolutionweren(Sn):n(Zn)=1%and2%respectively.Thephasecomposition,morphology,sizeaswellasopticalpropertiesofthesamplshavebeencharacterizedbymeansofX-raydiffraction(XRD),fieldemissionscanningelectronmicroscopy(FE-SEM),UV-Visibleabsorptionandphotoluminescence(PL)spectra.TheeffectsoftheSndopingconcentrationandthepHvalueoftheprecursorsolutiononthesurfacemorphologyandopticalpropertiesofthesampleshavealsobeenstudied.TheexperimentalresultsindicatethattheobtainedSn-dopedZnOnanocrystalsareofhexagonalwurtzitestructure.Theaveragegrainsizeofthesamplesincreasesandthesurfacemorphologygoesfromshortrod-liketosinglecone-likeanddoublecone-likewiththeincreaseofSnconcentration.Inaddition,thesurfacemorphologyofthesamplescanalsobeaffectedbythebasicityoftheprecursorsolution.Sinceitchangesfromlongrod-like(forpH7.0)toshortrod-like(forpH12.0).TherewasaUVabsorptionpeakfromtheUV-visibleabsorptionspectrawhichhaveared-shiftwiththeincreaseofSnconcentration.Threephotoluminescencebands,includingastrongpurpleemissionat433nm,alef-tshouldernearUVbandemissionaround401nmaswellasaweakblueemissionat466nmwereobservedatroomtemperature.TheintensitiesoftheemissionpeaksincreasedwiththeincreaseofSnconcentration.ComparedwiththatofundopedZnOnanocrysta,lonlytheintensitiesofemissionpeaksarechanged,butthepeakpositionsarealmostnotchangedintheSndopingconcentrationrangofourexperiments.KeyW0rds幺口。nanocrysta;lhydrothermalsynthesis;Sn-doping;opticalproperties目录口TOC\o"1-5"\h\z.引言 1.实验 2样品的制备 2样品的表征 2.结果与讨论 31X射线衍射(XRD)分析 3\o"CurrentDocument"形貌分析 5\o"CurrentDocument"紫外可见吸收光谱和光致发光分析 6\o"CurrentDocument".结论 9\o"CurrentDocument"参考文献 10\o"CurrentDocument"致 谢 13西安建筑科技大学课程设计（论文）西安建筑科技大学课程设计（论文）西安建筑科技大学课程设计（论文）第第#页共17页致谢本文是云老师的指导下完成的。感谢云老师在百忙之中对我的多次指导关怀，在课题试验过程中及论文撰写过程中，老师给予很大帮助。每次遇到困难，老师都能伸出援助之手，特别让感动的是老师在论文修