Preparation and Luminescence Properties of Self-assembly Based CdTe Hyper-branched Nanostructure†

doi:10.7503/cjcu20140630

Abstract

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

CLC Number:

TrendMD:

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

Figures/Tables 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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