ZnO/CdS复合纳米粒子的热分解合成及发光性能

Decomption Synthesis and Optical Property of ZnO/CdS Nanoparticles in the Presence of PEG400

    摘要
  • 摘要: 设计了简单的化学反应路线,在表面活性剂PEG400存在下通过简单的前驱体热分解反应合成了ZnO/CdS复合纳米粒子,其直径在4~10nm之间。前驱体则通过室温固相反应获得。用X射线衍射仪(XRD)和透射电子显微镜(TEM))对产物的结构和形貌进行了表征。同时,对产物的光致发光性能(PL)作了测试。结果表明:ZnO/CdS复合纳米粒子在380 nm处有一个较弱的归因于近带隙发射的发光峰,550 nm处较强的发射峰来自于由氧空位形成的深浅表面态所捕获的电子-空穴对的复合。另外,对它们的形成机理进行了简单的探讨。

     

    Abstract: In the paper,a simple chemical reaction route has been designed,and ZnO/CdS nanoparticles were successfully synthesized by the simple decomption in the presence of PEG400.The ZnO/CdS nanoparticles are about 4~10 nm in diameter.The product was characterized by X-ray Diffraction(XRD) and Transmission Electron Microscopy(TEM).The photoluminescence(PL) spectra of the ZnO/CdS nanoparticles exhibit a weak emission peak at 380 nm which is attributed to the near-band-edge exciton emission,and a strong emission peak at 550nm which arises due to the recombination of electron-hole pairs trapped at shallow and deep surface states formed by vacancy of oxygen respectively.The formation mechanism of the ZnO/CdS nanoparticles is also discussed in brief.

     

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