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微乳液法制备二氧化硅包覆ZnS:Mn/CdS纳米晶 被引量：9

Synthesis of Silica-overcoated ZnS:Mn/CdS Nanoparticles by Microemulsion Technique
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摘要 采用微乳液法制备核壳结构ZnS：Mn／CdS（-4．5nm）纳米晶，为获得水溶性纳米晶，继续向此微乳液添加硅酸乙酯（TEOS），并使用氨水作为催化剂，通过TEOS水解缩聚反应，在ZnS：Mn／CdS粒子表面生长连续的二氧化硅壳层。采用透射电子显微镜（TEM）、X射线衍射（XRD）、红外光谱（IR）、光致发光谱（PL）对其表面形貌、结构和光学特性进行表征。ZnS：Mn／CdS纳米粒子表面被二氧化硅壳层完全包覆，粒径大小约为10nm左右，粒子均匀性好。由于二氧化硅相无定形且透光性良好，二氧化硅包覆ZnS：Mn／CdS纳米晶的光学特性与未包覆的ZnS：Mn／CdS极其相似。 ZnS： Mn/CdS core/shell nanoparticles （ - 4.5nm） were pre-synthesized by microemulsion technique. To prepare water-soluble nanoparticles, tetraethyl orthosilicate （TEOS） was directly added into the same reverse micellar system to grow a consecutive silica shell on ZnS： Mn/CdS nanoparticles surface, using ammonium hydroxide （NH4OH） as catalyst. X-ray diffraction （XRD）, infrared spectrum （IR）, transmission electron microscope （ TEM）, Photoluminescence （PL） spectrum measurements were performed for the sample characterization. The silica-overcoated particles can grow to about 10nm with a good uniformity in size. Because silica is amorphous and optically transparent, the optical properties of silica-overcoated ZnS： Mn/CdS nanoparticles are found similar to those of uncoated ZnS： Mn/CdS nanoparticles.
作者 姚渊 李冬梅 桑文斌 晏刚
机构地区 上海大学材料学院电子信息材料系
出处 《人工晶体学报》 EI CAS CSCD 北大核心 2006年第2期400-403,共4页 Journal of Synthetic Crystals
基金 教育部高等学校优秀青年教师教学科研奖励计划资助项目 上海市重点学科(T0101)资助
关键词 微乳液 纳米微粒 ZnS:Mn/CdS 氧化硅壳层 光致发光 microemulsion nanoparticles ZnS ： Mn/CdS silica shell photoluminescence
分类号 O472 [理学—半导体物理]
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参考文献9

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人工晶体学报
2006年 第2期

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