物理化学学报 >> 2008, Vol. 24 >> Issue (07): 1219-1224.doi: 10.3866/PKU.WHXB20080717

研究论文 上一篇    下一篇

簇形和花形CdS纳米结构的自组装及光催化性能

许迪; 高爱梅; 邓文礼   

  1. 华南理工大学材料科学与工程学院, 广州 510640
  • 收稿日期:2008-01-10 修回日期:2008-03-27 发布日期:2008-07-04
  • 通讯作者: 邓文礼 E-mail:wldeng@scut.edu.cn

Self-Assembly and Photocatalytic Properties of Clustered and Flowerlike CdS Nanostructures

XU Di; GAO Ai-Mei; DENG Wen-Li   

  1. College of Materials Science and Engineering, South China University of Technology, Guangzhou 510640, P. R. China
  • Received:2008-01-10 Revised:2008-03-27 Published:2008-07-04
  • Contact: DENG Wen-Li E-mail:wldeng@scut.edu.cn

摘要: 通过可控溶剂热法, 利用乙二胺作为模板制备出簇形和花形硫化镉(CdS)纳米结构. 通过X射线衍射(XRD)和扫描电镜(SEM)观测其形貌和结构特征. XRD谱线显示, 簇形CdS为六方晶体结构, 而花形CdS纳米结构则为立方晶体. 实验结果表明, 整个自组装过程是由成核以及成核竞争引起的不同生长过程所组成的, 并且乙二胺的模板功能起了重要的作用. 通过不同时间和温度的实验, 深入探讨了簇形和花形CdS纳米结构的自组装机理. 室温光致发光谱(PL)显示这两种纳米结构在433 nm和565 nm附近有较强的发射峰, 分别对应激子发射和表面缺陷发光. 通过Brunauer-Emmett-Teller (BET)方法测试其比表面积. 研究了高压汞灯照射下, 簇形和花形CdS纳米结构在甲基橙(MeO)溶液中的光催化性能. 结果显示, 由于其较大的比表面积, 花形CdS纳米结构的光催化性能要远优于其它CdS材料.

关键词: 硫化镉, 纳米棒簇, 花形纳米结构, 自组装, 光催化

Abstract: Clustered and flowerlike CdS nanostructures were synthesized via the controllable solvent thermal
method using ethylenediamine as the structure-directing template. The phase structures and morphologies were measured by X-ray diffraction (XRD) and scanning electron microscopy (SEM). XRDpatterns demonstrated that the CdS nanorod cluster sample was hexagonal cell and the flowerlike CdS nanostructure was cubic cell. Experimental results showed that the whole self-assembly process was made-up of nucleation and growth, which was due to the competition in the nucleation. And the template function of ethylenediamine played an important role in the self-assembly. The self-assembly mechanisms of forming the clustered and flowerlike nanostructures were investigated on the basis of the time-and temperature-dependent experiments and were briefly discussed. At room temperature, photoluminescence (PL) spectrum experiments revealed that CdS nanostructures had two visible emission peaks respectively at the wavelengths of 433 nm and nearly 565 nm, which should arise respectively from the excitonic emission and surface-defect. The specific surface areas were characterized by the Brunauer-Emmett-Teller (BET) method. The photocatalysis of clustered and flowerlike CdS nanostructures in methyl orange (MeO) under high-pressure mercury lamp illumination was investigated. The experimental results indicated that the performance of photocatalytic system employing flowerlike CdS nanostructure, with higher specific surface area, was observed to be better than other CdS materials.

Key words: CdS, Nanorod clusters, Flowerlike nanostructures, Self-assembly, Photocatalysis

MSC2000: 

  • O649