树枝形分子的合成及其对纳米硫化镉生长的控制

刘少锋1;陈卫强2;杜振霞1;段宣明2

北京化工大学学报(自然科学版) ›› 2007, Vol. 34 ›› Issue (5) : 477-481.

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北京化工大学学报(自然科学版) ›› 2007, Vol. 34 ›› Issue (5) : 477-481.
化学与化学工程

树枝形分子的合成及其对纳米硫化镉生长的控制

  • 刘少锋;陈卫强;杜振霞;段宣明
作者信息 +

Synthesis of a polyamidoamine dendrimer and the preparationof CdS/polyamidoamine dendrimer nanocomposites

  • LIU ShaoFeng1;CHEN WeiQiang2;DU ZhenXia1;DUAN XuanMing2
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文章历史 +

摘要

用发散法合成了以苯胺为核的不同代数的聚酰胺-胺(PAMAM)型树枝状分子,采用核磁共振仪(NMR)对它们的结构进行了鉴定。又以第4代PAMAM树形分子(G4.0)为模板,在树形分子空腔内原位合成了硫化镉(CdS)纳米粒子。通过改变Cd2+与G4.0树枝状分子的摩尔比可以得到不同粒径的CdS量子点,并对其光学性能进行了表征。探讨了溶剂对CdS半导体纳米粒子在PAMAM模板中生长的影响。用UV-visible分光光度计和TEM对CdS纳米簇的大小和形貌进行了表征。结果表明TEM 观测的CdS纳米簇粒径要大于用Brus公式估算的数值。

Abstract

A series of polyamidoamine (PAMAM) dendrimers with an aniline amino group at the center have been prepared through repetitive Michael addition and amidation reactions. Their structures were characterized by 1H NMR spectroscopy. Well-dispersed CdS quantum dots (QDs) with narrow size-distribution were prepared using generation 4.0 (G4.0) amine-terminated PAMAM dendrimers as the template. A series of CdS/PAMAM dendrimer nanocomposites with different diameters were prepared by addition of Na2S to a methanol solution of Cd2+/PAMAM complexeswith different Cd2+/PAMAM ratios. The resulting CdS/PAMAM nanocomposites were characterized by UV-visible and photoluminescence spectrophotometry and TEM. The stability, diameter and dispersion of the CdS clusters were found to be significantly affected by varying the ratio of Cd2+ to G4.0 PAMAM dendrimer. The results also showed that the dispersion of CdS/PAMAM nanocomposites was better and the diameters were larger when glycerine was used as the solvent in place of methanol.

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刘少锋1;陈卫强2;杜振霞1;段宣明2. 树枝形分子的合成及其对纳米硫化镉生长的控制[J]. 北京化工大学学报(自然科学版), 2007, 34(5): 477-481
LIU ShaoFeng1;CHEN WeiQiang2;DU ZhenXia1;DUAN XuanMing2. Synthesis of a polyamidoamine dendrimer and the preparationof CdS/polyamidoamine dendrimer nanocomposites[J]. Journal of Beijing University of Chemical Technology, 2007, 34(5): 477-481

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