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首页> 外文会议>TechConnect World Innovation Conference and Exposition >Water Synthesis of Glutathione- capped Cadmium Selenide Quantum Dots and Stabilization by PVP Coating at Room Temperature
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Water Synthesis of Glutathione- capped Cadmium Selenide Quantum Dots and Stabilization by PVP Coating at Room Temperature

机译：室温下PVP涂层水合成谷胱甘肽镉硒化镉量子点及稳定化

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摘要

We report the water-based synthesis and effective stabilization of glutathione-capped cadmium selenide quantum dots (GSH-CdSe QDs) with PVP, and study their optical properties. X-ray diffraction and transmission electron microscopy were applied to elucidate the structure and morphology of the materials. The absorption spectra indicate that bare GSH-CdSe QDs exhibit a maximum absorption peak at ～340 nm, which was red shifted (～100 nm) upon coating the QDs with PVP. It was also observed that PVP-coated GSH-CdSe QDs show a strong red-orange emission band peaking at ～ 450 nm. No thiol group was observed on the QD surfaces, which is a clear indicator of the successful GSH-capping. FTIR analyses also reveal that the GSH signal completely disappears by coating the QDs with PVP, showing its characteristic bonds. Furthermore, our findings evidence that the polymeric coating provides the QDs with a high degree of stability suitable for biomedical applications, especially in cell bio-imaging. Stability studies were made to the QDs indicating a shift in the absorbance peak of the GSH QDs, while the QDs coated with PVP did not showed any shift. Proving that polymeric material can give stability to QDs.
机译：我们报告了水基合成，并用PVP稳定谷胱甘肽升镉量子点（GSH-CDSE QDS），研究它们的光学性质。应用X射线衍射和透射电子显微镜检查以阐明材料的结构和形态。吸收光谱表明裸GSH-CDSEQDS在〜340nm处表现出最大吸收峰，在用PVP涂覆QD时，在施加QD时是红色的换档（〜100nm）。还观察到PVP涂覆的GSH-CDSE QDS在〜450nm处显示出强烈的红橙色发射带。在QD表面上观察到硫醇组，这是成功GSH封端的清晰指标。 FTIR分析还揭示了GSH信号通过用PVP涂覆QD来完全消失，显示其特征键。此外，我们的发现证据表明聚合物涂层为QD提供高度适用于生物医学应用的稳定性，特别是在细胞生物成像中。对QDS进行稳定性研究，表示GSH QD的吸光度峰值的变化，而涂有PVP的QD没有显示出任何偏移。证明聚合物材料可以使QDS稳定。

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