基于紫外光辐照法制备CuSe/ZnSe核壳结构纳米粒子

Preparation of CuSe /ZnSe core-shell structured nanoparticles under UV irradiation

摘要:

本文成功制备出以CuSe为核心、ZnSe为壳层，具有核壳结构的CuSe/ZnSe纳米粒子。首先采用回流冷凝法制备出CuSe纳米粒子（NPs）。然后，采用一种简单、快速的光化学方法即紫外光辐照法，室温下在CuSe NPs外包覆ZnSe壳层，最终得到CuSe/ZnSe核壳结构纳米粒子。利用X射线衍射(XRD)、能量色散谱仪(EDS)、透射电镜(TEM)、高分辨透射电镜(HRTEM)和光致发光光谱(PL)对合成的CuSe/ZnSe核壳NPs进行了表征。结果分析表明，合成的CuSe纳米粒子具有六方相结构，粒径平均大小在12 nm。制备出的CuSe/ZnSe纳米粒子的核壳结构清晰，生长的ZnSe壳层为立方闪锌矿结构，粒径大小约为15~45 nm。通过ZnSe壳层的包覆使CuSe在475 nm处产生蓝光发射，同时荧光强度显著增强。

Abstract:

In this paper, CuSe/ZnSe nanoparticles with core-shell structure with CuSe as the core and ZnSe as the shell were successfully prepared were prepared. First, CuSe nanoparticles (NPs) were prepared by reflux condensation. Then, a simple and rapid photochemical method, namely ultraviolet illumination, was used to grow ZnSe shells on CuSe nanoparticles at room temperature. Finally, CuSe/ZnSe core-shell nanoparticles were obtained. The synthesized CuSe/ZnSe core-shell NPs was characterized by different analyses methods such as X-ray diffraction (XRD), energy dispersive spectroscopy (EDS), transmission electron microscopy (TEM), high resolution transmission electron microscopy (HRTEM) and Photoluminescence Spectroscopy (PL). The results show that the synthesized CuSe nanoparticles have hexagonal phase structure with an average particle size of 12 nm. The core-shell structure of CuSe/ZnSe nanoparticles is clear, and the ZnSe shell is of cubic sphalerite structure with a particle size of about 15~45 nm. The blue light emission at 475 nm was induced by the coating of ZnSe shell, and the fluorescence intensity was significantly enhanced.