高等学校化学学报

高等学校化学学报

• 研究论文 • 上一篇    下一篇

高质量CdTe量子点的水相快速合成

梁佳然1, 钟文英1, 于俊生2   

    1. 中国药科大学基础部分析化学教研室, 南京 210009;
    2. 南京大学化学化工学院, 南京 210093
  • 收稿日期:2008-03-26 修回日期:1900-01-01 出版日期:2009-01-10 发布日期:2009-01-10
  • 通讯作者: 钟文英

Rapid Aqueous Synthesis of High-quality CdTe Colloidal Quantum Dots

LIANG Jia-Ran1, ZHONG Wen-Ying1*, YU Jun-Sheng2   

    1. Department of Analytical Chemistry, China Pharmaceutical University, Nanjing 210009, China;
    2. School of Chemistry and Chemical Engineering, Nanjing University, Nanjing 210093, China
  • Received:2008-03-26 Revised:1900-01-01 Online:2009-01-10 Published:2009-01-10
  • Contact: ZHONG Wen-Ying

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被引次数

88

摘要： 系统考察了水相合成CdTe量子点的主要影响因素, 通过改变无水乙醇-水体系的体积, 提高NaHTe的合成质量, 并调整反应温度, 改变反应的初始pH值, 在水相中快速合成了量子产率高、粒径分布范围窄的CdTe量子点, 实现了对量子点发光性质的调控, 在最佳条件(无水乙醇3 mL, 水1 mL, 反应初始pH 8.0, 反应温度40 ℃)下, 最高量子产率达68%. 量子点胶体溶液在回流过程中有时产生白色沉淀, 放置7 d后, 未过滤白色沉淀的量子点比过滤后的量子点荧光强度提高15%, 白色沉淀还有减小粒径分布的作用.

关键词: CdTe量子点, 水相快速合成, 无水乙醇-水体系, 白色沉淀

Abstract: The rapid aqueous synthesis of CdTe quantum dots modified by thioglycolic acid(TGA) was stu-died through investigating and improving the factors which influence the synthesis. The control of photoluminescence properties was realized through systematically changing the volume of anhydrous ethanol and water, the temperature and the original pH value. The high-quality CdTe QDs with narrower full width at half maximum of photoluminescence spectra and larger quantum yield were obtained. Under the optimal condition(as the volume of anhydrous ethanol and water is 3 and 1 mL, original pH value is 8.0, the temperature is 40 ℃), the maximum quantum yield at room temperature is approximately 68%. A white precipitate emerged during reflux. After depositing for a week, the fluorescence intensity of the QDs with white precipitate was dramatically enhanced by 15% than that of the QDs which the white precipitate was removed. Besides, the white precipitate is preferable for the narrowing of the size distribution.

Key words: CdTe quantum dots, Rapid aqueous synthesis, Anhydrous ethanol-water, White precipitate

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