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Optimization of the aqueous synthesis of Cu2S quantum dots with different surface ligands

机译:不同表面配体的Cu2S量子点水合成的优化

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Surface functionalization of quantum dots (QDs) is one of the most important aspects of designing and preparing the desired QDs for intended optical and biomedical applications. In this paper, we synthesized aqueous-phase Cu2S quantum dots coating by three different stabilizers, i.e. mercaptoacetic acid, mercaptopropionic acid and glutathione (GSH). Different stabilizers can influence the coordination modes between Cu+ on the surface of Cu2S and S2- of the ligand. The Cu2S QDs were characterized by UV-vis spectroscopy, energy dispersive spectrometry, transmission electron microscopy, Fourier transform infrared spectroscopy, x-ray diffraction and Raman spectra. Then, we performed a systematic study to evaluate the colloidal stability and in vitro toxicity of the formulations of Cu2S QDs with different stabilizers. Our results show that Cu2S QDs modified with different stabilizers have distinct functional groups on their surface and these groups make Cu2S produce different vibrations according to Raman spectra. The Cu2S-GSH exhibit the best colloidal stability in all pH buffer solutions and the lowest toxicity compare to the other two stabilizers. These properties make the Cu2S-GSH quantum dots a candidate for bioapplications in the future.
机译:量子点(QD)的表面功能化是为预期的光学和生物医学应用设计和制备所需QD的最重要方面之一。在本文中,我们合成了由三种不同的稳定剂即巯基乙酸,巯基丙酸和谷胱甘肽(GSH)组成的水相Cu2S量子点涂层。不同的稳定剂可能会影响Cu2S表面的Cu +与配体的S2-之间的配位方式。通过紫外可见光谱,能量色散光谱,透射电子显微镜,傅立叶变换红外光谱,X射线衍射和拉曼光谱对Cu2S量子点进行了表征。然后,我们进行了系统的研究,以评估具有不同稳定剂的Cu2S量子点制剂的胶体稳定性和体外毒性。我们的结果表明,用不同稳定剂改性的Cu2S量子点在其表面具有不同的官能团,这些基团使Cu2S根据拉曼光谱产生不同的振动。与其他两种稳定剂相比,Cu2S-GSH在所有pH缓冲溶液中均表现出最佳的胶体稳定性,且毒性最低。这些特性使Cu2S-GSH量子点成为未来生物应用的候选者。

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