Preparation and Property of CuInS2/ZnS Core-shell Quantum Dots in Aqueous Phase

doi:10.15541/jim20170140

Abstract

Abstract:

Owing to the absence of Cd, Pb, Te and other toxic elements, and the widely tunable fluorescence emission spectra from visible to near infrared light, CuInS₂ quantum dots (QDs), as a new type of I-III-VI semiconductor materials, have been applied in biological detection and analysis imaging. In this study a fast and low temperature method was proposed to synthesize CuInS₂ and its ZnS core-shell structure QDs with low toxicity raw materials. The ZnS outer layer suppresses the surface defects to improve the luminescence properties of CuInS₂ QDs, and further reduces biological toxicity. CuInS₂ QDs exhibited an obvious emission peak at 530 nm when the molar ratio of Cu∶In was 1∶1. With the increase of In content, the luminescence peak presents a gradual redshift. After coated with ZnS shell, the luminous intensity of QDs obviously increased and the emission peak red shifted. Further more, when the molar ratio of Cu∶Zn was 1∶1 and the reflux time was 45 min, the luminescent properties of the synthesized CuInS₂/ZnS QDs were optimized. This synthesis method takes the advantages of energy saving, high production efficiency, and excellent environmental friendship, showing wide application potential.

Key words: CuInS₂, CuInS₂/ZnS, core-shell structure, aqueous phase

CLC Number:

TQ174

ZHOU Bei-Ying, CHEN Dong, LIU Jia-Le, JIANG Wan, LUO Wei, WANG Lian-Jun. Preparation and Property of CuInS₂/ZnS Core-shell Quantum Dots in Aqueous Phase[J]. Journal of Inorganic Materials, 2018, 33(3): 279-283.

Figures/Tables 5

Fig. 1 TEM images of the as-prepared CuInS2 quantum dots (QDs) (a) and CuInS2/ZnS core-shell QDs (b) with insets showing HRTEM images of corresponding QDs

Fig. 2 XRD patterns of CuInS2 and CuInS2/ZnS QDs

Fig. 3 UV-Vis absorption spectra (dotted lines) and photoluminescence spectra (solid lines) of CuInS2 QDs solution with varied molar ratios of Cu:In

Fig. 4 Photoluminescence spectra of the CuInS2/ZnS QDs with different molar ratios of Cu∶Zn

Fig. 5 Photoluminescence spectra of CuInS2/ZnS QDs with different reflux time

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Preparation and Property of CuInS₂/ZnS Core-shell Quantum Dots in Aqueous Phase

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