手性模板合成CdS纳米棒

由于纳米材料具有量子尺寸效应及大的比表面积等性质而使其在电子学[1]、光学[2]、催化[3]和陶瓷[4]等领域显示出诱人的应用前景. 近年来纳米材料的制备及纳米技术发展迅速, 特别是具有特殊光电活性的新型无机纳米材料的制备已引起人们的普遍关注. 现在合成纳米材料的方法主要包括反相胶束法[5]、 LB膜法[6]、嵌段共聚物法[7]和模板合成法[8]. 其中模板合成技术不仅可以通过设计新型的模板分子, 还可通过模板分子的不同自组装行为来调控纳米材料的尺寸和形貌. Stupp等[9]曾利用溶致液晶的六方中间相作为模板, 在其纳米孔隙中成功地合成了具有六方排列超晶格纳米结构的材料. 本文以双亲性丙氨酸衍生物为模板, 在不同的化学微环境下合成了结构不同的CdS纳米棒.

Synthesis of CdS Nanorods with Chiral Template

In the paper, two kinds of CdS nanorods with diameter of 50-150 nm were synthesized by using amphiphilic alanine as the templating reagent. XRD, TEM and polarized light microscopy were used to examine the course of CdS growth. The nanorod with a hexagonal pore microstructure was fabricated when the mesophase exhibited hexagonal morphology of the polarized light microscopy image. The XRD pattern of the nanorods with hexagonal pore microstructure showed a clear peak in 2H=0.88° which suggested the existence of hexagonal pore. While the mesophase disappeared and isotropic polarized light microscopy image shows that CdS would propagate into nanorod without hexagonal pore. It was deduced that nanorods with hexagonal pore grow in the hole of hexagonal liquid crystal and those CdS growth without hexagonal pore are in isotropic solution by the absorption of amphilphilic alanine. It was suggested that different nanostructures could be generated under various chemical micro-environments to reveal their special functionalities.