核/壳结构的ZnS∶Mn/SiO<SUB>2</SUB>纳米粒子的制备及发光性质研究

doi:10.3964/j.issn.1000-0593(2010)03-0607-05

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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。

关键词：ZnS∶Mn/SiO₂;核/壳结构;纳米粒子;发光

Abstract：Mn-doped ZnS nanopatricles synthesized by solvothermal method were successfully coated with SiO₂ shells of various thicknesses by hydrolysis reaction of tetraethyl orthosilicate (TEOS). The samples were characterized by X-ray diffraction(XRD), transmission electron microscopy images (TEM), X-ray photoelectron spectroscopy (XPS) and the room temperature photoluminescence (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 nanoparticles.

Key words：ZnS∶Mn/SiO₂;Core/shell structure;Nanoparticles;Luminescence

收稿日期: 2009-03-29 修订日期: 2009-07-02

中图分类号:

O482.3

通讯作者: 曹立新 E-mail: caolixin@mail.ouc.edu.cn

引用本文:

姜代旬，曹立新^*，柳伟，苏革，曲华，孙远光，董博华 . 核/壳结构的ZnS∶Mn/SiO₂纳米粒子的制备及发光性质研究[J]. 光谱学与光谱分析, 2010, 30(03): 607-611.
JIANG Dai-xun, CAO Li-xin^*, LIU Wei, SU Ge, QU Hua, SUN Yuan-guang, DONG Bo-hua . Synthesis and Photoluminescent Properties of Core/Shell Structure ZnS∶Mn/SiO₂ Nanocrystals. SPECTROSCOPY AND SPECTRAL ANALYSIS, 2010, 30(03): 607-611.

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