基于CdTe量子点自组装的超分支结构的制备及发光特性

doi:10.7503/cjcu20140630

摘要/Abstract

摘要：

提出了一种简单高效制备立体型纳米结构的方法. 利用强偶极相互作用, CdTe量子点通过层级自组装形成超分支纳米结构. 场发射高分辨透射电子显微(HRTEM)照片显示, 制备的超分支纳米结构的构建单元即为原始的CdTe量子点, 即组装后的结构保留了原始量子点的量子局限特性. 该结构形态受熟化时间、环境pH值以及沉淀剂比例的影响. 荧光实验发现, 该结构良好地保持了原始量子点的线性光学特性. 由于其超分支形态与量子局限效应同时存在, 因此该种结构在光伏转换和传感等领域有着重要的潜在应用价值.

关键词: 量子点, 超分支结构, 自组装, 荧光光谱

Abstract:

We propose a simple and efficient method to build three-dimensional nanostructure. Driven by the strong dipole interaction, CdTe quantum dots can form the hyper-branched nanostructures with layer-by-layer self-assembly process. The HRTEM images show that the prepared hyper-branched nanostructures are polycrystal structures and composed by the original CdTe quantum dots. Thus the quantum confinement effect of original quantum dots is inherited by formed nanostructures. Experimental results indicate that the configurations of nanostructures can be influenced by the curing time, pH value of solution and proportion of precipitation agent. The luminescence experiment shows that the formed hyper-branched nanostructure well keep the linear optical properties of original quantum dots, therefore these nanostructures own the great potential to be used in the field of photovoltaic conversion, sensor and so on.

Key words: Quantum dots, Hyper-branched nanostructure, Self-assembly, Luminescence spectrum

中图分类号:

TrendMD:

段彬, 王志伟, 潘根才, 潘凌云. 基于CdTe量子点自组装的超分支结构的制备及发光特性. 高等学校化学学报, 2014, 35(11): 2303.

DUAN Bin, WANG Zhiwei, PAN Gencai, PAN Lingyun. Preparation and Luminescence Properties of Self-assembly Based CdTe Hyper-branched Nanostructure^†. Chem. J. Chinese Universities, 2014, 35(11): 2303.

图/表 7

Fig.1 HRTEM image of original CdTe quantum dots

Fig.2 SEM images with different magnification of CdTe hyper-branched nanostructures after curing for 300 min

Fig.3 HRTEM images of typical CdTe hyper-branched nanostructure(A) and details at the end of the nanowire(B)

Fig.4 SEM images of CdTe quantum dots precipitated by different volume ratio of acetonitrile at pH=7.0 V(QDs):V(Ace): (A) 1:3; (B) 1:5; (C) 1:7; (D) 1:9.

Fig.5 SEM images of CdTe quantum dots precipitated by different volume ratio of acetonitrile at pH=9.0 V(QDs):V(Ace): (A) 1:3; (B) 1:5; (C) 1:7; (D) 1:9.

Fig.6 UV-Visible absorption spectra(A) and luminescence spectra(B) of CdTe hyper-branched nanostructures with different curing time a. Original QDs. Curing time/min: b. 90; c. 200; d. 330.

Fig.7 Luminescence microscopic images of the CdTe hyper-branched nanostructures (A) and (B): the images taken from different zones in the same substrate.

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