文档介绍：SYNTHESiS AND CHARACTEIUZATION oF STRUCTURE ZINC SULFIDE NANOMATERIALS AThesis Submitted to Shaanxi University ofScience and Technology inPartialFulfillmentof theRequirement fortheDegree of Thesis May,2010 纳米硫化锌核壳复合结构的制备与表征摘要纳米材料具有体相材料所不具备的新颖的光学、电学以及磁学等性质, 引起了人们广泛的研究和关注。纳米粒子是研究最早最广泛的纳米材料。 ZnS是一种II.Ⅵ族化合物直接带隙半导体材料,有着良好的光学性能,在光电方面有很好的应用。但硫化物具有性质不稳定、易潮解、抗老化性差、余辉延时时间短等缺点,实际应用受到很大限制。而Si02'|生质稳定、光学透明、能带较宽(),Si02表面的硅羟基使它非常适合用于材料的表面改性, 。,并研究了复合体系的光致发光特性。 ZnS粉体的形貌特征是成功制备核壳复合结构的关键。本论文采用水热法、固相法、沉淀法,三种方法制备ZnS纳米粉体,并进行了各种分析和表征。通过测试手段分析对比发现:三种方法中水热法制备的ZnS粉体形貌特征较适合被Si02包覆,形成核壳复合结构。采用溶胶一凝胶法制备 ZnS/Si02核壳复合结构,根据TEOS(硅酸乙酯)加入量的不同,设计了三组单变量实验。XRD、SEM、荧光光谱分析等测试结果表明:ZnS被Si02 包覆形成核壳结构后能阻碍晶粒氧化及缺陷的产生;分散性、热稳定性、光致发光性能都得到了提高;而且还可以通过改变TEOS的加入量对壳层厚度进行调控。关键词:硫化锌,纳米粒子,核壳结构,光致发光,二氧化硅 SYNTHE SISAND CHARACTERIZATIoN oF CoRE—PoSITE STRUCTURE ZINC SULFIDE NANoM队TER队LS ABSTRACT Different from theircorresponding bulkmaterials,nanomaterials have the optic,electric,ic properties and have been intensively investigated by people,Nanoparticles are one ofthemost important part sulfide(ZnS)is an important II一Ⅵsemiconducting material,having good performance isofgreatimportance tronic Zinc sulfidehasmany disadvantages,such asunstable state, deliquescence,poor anti-ageing ability,short delay timeofpersistence,and its application isvery ,opticalproperty andtransparent,silica(Si02) haswider energy band(),hydroxyl ofsiliconsurfaceofSi02 makes itvery suitableformaterialsurfacemodification,such asthe formation ofvarious types ofcore-shell thiswork,ZnS/Si02 core—plex structure was prepared by sol—gelmethod,and photoluminescence characteristics pound system were alsostudied. The morphological featuresofZnS powder is akey essfully preparing core—plex thisdissertation,ZnS nanopaticles was synthesized with threemethods ofhydrothermal,solid phaseandprecipitation and aloto