核/壳结构的ZnS:Mn/SiO_2纳米粒子的制备及发光性质研究  

Synthesis and Photoluminescent Properties of Core/Shell Structure ZnS:Mn/SiO_2 Nanocrystals

作　　者：姜代旬[1] 曹立新[1] 柳伟[1] 苏革[1] 曲华[1] 孙远光[1] 董博华[1] 

机构地区：[1]中国海洋大学材料科学与工程研究院,山东青岛266100

出　　处：《光谱学与光谱分析》2010年第3期607-611,共5页Spectroscopy and Spectral Analysis

基　　金：国家自然科学基金项目(50672089);山东省优秀中青年科学家奖励基金项目(2006BS04034);2008年教育部新世纪优秀人才支持计划项目(NCET-08-0511)资助

摘　　要：采用溶剂热法制备了Mn离子掺杂的ZnS纳米粒子(ZnS∶Mn),然后利用正硅酸乙酯(TEOS)的水解反应对其进行了不同厚度的SiO2无机壳层包覆。采用X射线衍射(XRD)、透射电子显微镜(TEM)、X射线光电子能谱(XPS)及荧光发射光谱(PL)对样品的结构及光学性质进行了表征和研究。包覆SiO2壳层后,粒子的粒径明显增大并且在ZnS∶Mn纳米粒子表面可以观察到明显的SiO2壳层。XPS测试印证了ZnS∶Mn/SiO2的核壳结构。随着SiO2壳层的增厚,ZnS∶Mn/SiO2的Mn离子的发光先增强后减弱,这是因为SiO2壳层同时具有表面修饰和降低发光中心浓度这两种相反的作用。当壳层厚度(壳与核的物质的量的比)达到5时,发光效果达到最好,其强度达到未包覆样品的7.5倍。Mn-doped ZnS nanopatricles synthesized by solvothermal method were successfully coated with SiO2 shells of various thicknesses by hydrolysis reaction of tetraethyl orthosilieate （TEOS）. The samples were characterized by X-ray diffraction （XRD）, transmission electron microscopy images （TEM）, X-ray photoelectron spectroscopy （XPS） and the room temperature photolumineseence （PL） spectra. When the ZnS ： Mn nanoparticles were coated with SiO2 shells, an obvious increase in particle size and a clear shell of SiO2 can be observed. The XPS measurement also gave the evidence for the core/shell structure of ZnS ： Mn/SiO2 nanoparticles. Because the surface modification effect and the decrease in luminescent centers effect are concurrent in the SiO2 shells, the Mn emission intensity first increased and then decreased with the, thickening of the SiO2 shell. The intensity, which attained its maxium at 5 shell thickness, was as 7 times as that for the bare ZnS ： Mn nanopartieles.

关 键 词：ZnS∶Mn/SiO2 核/壳结构 纳米粒子 发光 

分 类 号：O482.3[理学—固体物理]