Synthesis of magnetofluorescence Gd-doped CuInS2/ZnS quantum dots with enhanced longitudinal relaxivity

Literature Information

Publication Date 2016-02-03
DOI 10.1039/C5CP07063E
Impact Factor 3.676
Authors

Jia-Yaw Chang, Guan-Rong Chen, Jyun-Dong Li


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Abstract

In this paper, we describe the rapid microwave-assisted synthesis of Gd3+-doped CuInS2 (Gd:CIS) quaternary quantum dots (q-dots), which integrate the functions of optical fluorescence and magnetic resonance imaging. Through passivation of ZnS shells around Gd:CIS cores, high-quality and robust photostable Gd:CIS/ZnS core/shell q-dots with enhanced quantum yields were obtained. The intensity and peak-to-peak linewidth of the electron spin resonance (EPR) signal were found to vary depending on the Gd3+ concentration of Gd:CIS/ZnS. Benefiting from the incorporation of paramagnetic Gd3+ ions, the formed q-dots exhibited well-resolved and strong signals of electron paramagnetic resonance and provided significant contrast enhancement in T1-weighted images owing to the remarkably high longitudinal relaxivity (r1 = 55.90 mM−1 s−1) and low r2/r1 ratio (1.42), which are significantly higher than those of commercially available T1 contrast agents. We expect that this facile one-pot synthetic strategy can be extended to the preparation of other Cu-based sulfide quaternary nanomaterials.

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Physical Chemistry Chemical Physics

Physical Chemistry Chemical Physics
CiteScore: 5.5
Self-citation Rate: 10.3%
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