CdSe包覆层数对水溶性CdTe/CdSe (II型)核壳量子点的光学特性和微观结构的影响

引用本文: 彭静, 方晓明, 陈志鸿, 张正国. CdSe包覆层数对水溶性CdTe/CdSe (II型)核壳量子点的光学特性和微观结构的影响[J]. 物理化学学报, 2012, 28(01): 232-238. doi: 10.3866/PKU.WHXB201111151 shu

Citation: PENG Jing, FANG Xiao-Ming, CHEN Zhi-Hong, ZHANG Zheng-Guo. Effects of CdSe Layer Number on the Optical Properties and Microstructures of CdTe/CdSe (II) Core/Shell Quantum Dots[J]. Acta Physico-Chimica Sinica, 2012, 28(01): 232-238. doi: 10.3866/PKU.WHXB201111151 shu

CdSe包覆层数对水溶性CdTe/CdSe (II型)核壳量子点的光学特性和微观结构的影响

基金项目:
国家自然科学基金(20573038, 60976053)资助项目 (20573038, 60976053)

摘要: 在水相合成的CdTe量子点的体系中通过分批次加入新鲜配制的NaHSe和CdCl₂溶液, 制备出了CdSe包覆层数不同的CdTe/CdSe核壳量子点, 并着重考察了CdSe包覆层数对CdTe/CdSe核壳量子点的光学特性以及微观结构的影响. 与CdTe 量子点相比, CdSe单层包覆的CdTe/CdSe 核壳量子点的吸收峰和荧光发射峰出现明显红移; 随着CdSe包覆层数的增多, CdTe/CdSe 核壳量子点吸收光谱的覆盖范围向长波方向扩展, 荧光发射峰强度逐步下降, 荧光寿命大幅延长, 体现出II 型核壳量子点的特征. X射线衍射(XRD)分析表明, 随着CdSe包覆层数的增多, CdTe/CdSe 核壳量子点的粉末衍射峰由CdTe 衍射峰位置逐步向CdSe衍射峰位置靠近. CdTe/CdSe核壳量子点因其延伸到近红外区域的宽吸收特性致使其在太阳电池领域具有重要的应用前景.

关键词:

English

Effects of CdSe Layer Number on the Optical Properties and Microstructures of CdTe/CdSe (II) Core/Shell Quantum Dots

1.
Key Laboratory of Enhanced Heat Transfer and Energy Conservation, Ministry of Education, School of Chemistry and Chemical Engineering, South China University of Technology, Guangzhou 510640, P. R. China
Received Date: 14 July 2011
Available Online: 29 December 2011
Fund Project:
国家自然科学基金(20573038, 60976053)资助项目

Abstract: CdTe/CdSe core/shell quantum dots (QDs) with different numbers of CdSe layers were synthesized in aqueous media by sequentially adding freshly-prepared solutions of NaHSe and CdCl₂ to a solution of CdTe QDs several times. The optical properties and microstructures of the resulting QDs were investigated. Compared with those of CdTe QDs, the optical absorption and fluorescence emission peaks of CdTe/CdSe core/shell QDs with a single CdSe layer shifted to longer wavelength. As the number of CdSe layers was increased, the optical absorption spectra of the CdTe/CdSe core/shell QDs covered a wider range and extended to longer wavelengths, the intensity of fluorescence emission decreased gradually, and the fluorescence lifetime increased significantly, consistent with the behavior of type II core/ shell QDs. Compared with those of CdTe/CdSe QDs with a single CdSe layer, the diffraction peaks of the CdTe/CdSe QDs with three CdSe layers shifted from the standard positions of CdTe diffraction peaks to those of CdSe. The CdTe/CdSe type II core/shell QDs show promise for application in solar cells because of their broad absorption spectra that extend to longer wavelengths.

Key words:

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1.
沈阳化工大学材料科学与工程学院沈阳 110142

CdSe包覆层数对水溶性CdTe/CdSe (II型)核壳量子点的光学特性和微观结构的影响

English

Effects of CdSe Layer Number on the Optical Properties and Microstructures of CdTe/CdSe (II) Core/Shell Quantum Dots

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通讯作者: 陈斌, bchen63@163.com

中国化学会秘书处

CdSe包覆层数对水溶性CdTe/CdSe (II型)核壳量子点的光学特性和微观结构的影响

English

Effects of CdSe Layer Number on the Optical Properties and Microstructures of CdTe/CdSe (II) Core/Shell Quantum Dots

CCS Chemistry：嵌段共聚物自组装成 “三明治”二维有机材料，实现纳米级压力传感功能

CCS Chemistry：颜徐州、鲍哲南： 你的皮肤可能是一片SPMs

CCS Chemistry：工作高效不疲劳，只须让催化剂动起来

CCS Chemistry：静电组装导向聚合- 聚电解质纳米凝胶量化制备新策略

CCS Chemistry：金黄色葡萄球菌醛基脱氢酶是如何识别特异性底物的？

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