物理化学学报 >> 2010, Vol. 26 >> Issue (02): 511-514.doi: 10.3866/PKU.WHXB20100210

材料物理化学 上一篇    下一篇

CdS纳米棒的制备、表征及其形成机理

陈书堂, 张小玲, 侯晓淼, 周琦   

  1. 北京理工大学理学院化学系, 北京 100081
  • 收稿日期:2009-07-17 修回日期:2009-11-23 发布日期:2010-01-26
  • 通讯作者: 张小玲 E-mail:zhangxl@bit.edu.cn

Synthesis, Characterization and Formation Mechanism of CdS Nanorods

CHEN Shu-Tang, ZHANG Xiao-Ling, HOU Xiao-Miao, ZHOU Qi   

  1. Department of Chemistry, School of Science, Beijing Institute of Technology, Beijing 100081, P. R. China
  • Received:2009-07-17 Revised:2009-11-23 Published:2010-01-26
  • Contact: ZHANG Xiao-Ling E-mail:zhangxl@bit.edu.cn

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摘要：

以三辛基膦(TOP)为单一配位溶剂, 二水合乙酸镉和硫粉为前驱体, 用高温热解的方法制备CdS纳米棒. 通过X射线衍射(XRD)、透射电镜(TEM)、高分辨透射电镜(HRTEM)、紫外-可见(UV-Vis)分光光度计、荧光(PL)光谱、傅里叶变换红外(FTIR)光谱和核磁共振磷谱(31P NMR)等方法对样品的结构、形貌和光学特性进行了表征. 考察了前驱体Cd/S摩尔比和反应物浓度对硫化镉纳米结构的影响. 实验结果表明, 该法制备的CdS纳米棒为纤锌矿结构, 直径为4.0 nm, 长度为28.0 nm, 沿[001]方向择优生长, 具有量子限域效应. 同时, 对CdS纳米晶的形成机理进行了初步的探讨.

关键词: 纳米棒, 硫化镉, 三辛基膦, 合成, 荧光

Abstract:

CdS nanorods were successfully synthesized by pyrolysis using trioctylphosphine (TOP) as a coordinating solvent. For this pyrolysis, cadmium acetate dihydrate and sulfur powder were used as the cadmium source and sulfur source, respectively. The structure, morphology, and optical properties of the prepared samples were characterized by X-ray diffraction (XRD), transmission electron microscopy (TEM), high-resolution transmission electron microscopy (HRTEM), ultraviolet-visible (UV-Vis) spectroscopy, photoluminescence (PL), Fourier transform infrared (FTIR) spectroscopy, and nuclear magnetic resonance (NMR) 31P spectroscopy. The effects of different molar ratios of Cd-to-S and the reaction concentrations on the morphology and size of the CdS nanostructures were investigated. The results indicated that the wurtzite CdS nanorods, with a typical diameter of 4.5 nm and a length of up to 28.0 nm, had a preferential [001] growth direction and displayed a quantum confinement effect. We also proposed a possible formation mechanismfor the CdS nanocrystals based on the experimental results.

Key words: Nanorods, Cadmiumsulfide, Trioctylphosphine, Synthesis, Photoluminescence