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首页> 外文期刊>Journal of Nanoparticle Research >Silica-coated quantum dots fluorescent spheres synthesized using a quaternary ‘water-in-oil’ microemulsion system
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Silica-coated quantum dots fluorescent spheres synthesized using a quaternary ‘water-in-oil’ microemulsion system

机译：使用四元“油包水”微乳液系统合成的二氧化硅包覆的量子点荧光球

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摘要

Nanoscale and microscale silica spheres embedded with multiple CdSe quantum dots (QDs, having average diameters of about 2.4 and 5.0 nm, respectively.) were synthesized by using a quaternary ‘water-in-oil’ microemulsion. Comparing the uncoated QDs, the quantum yields (QYs) of the silica-coated QD spheres were enhanced when the QD cores were synthesized using mercaptoacetic acid (MA) as a stabilizer, while the QYs were dramatically decreased when the cores were synthesized using citric acid (CA) as a stabilizer. The enhanced QYs could be further improved by heating the silica-coated QDs in aqueous solution. Although the QYs of the silica-coated QDs were not high, these spheres emitted bright fluorescence. The silica shells contained numerous micropores (～0.58–0.91 nm), and small amounts of toxic ions (such as Cd2+) could be released from the silica spheres. However, the release rate of toxic ions from the silica spheres was significantly reduced compared with that of the uncoated QDs.
机译：使用四元“油包水”微乳液合成了嵌入多个CdSe量子点（分别具有约2.4和5.0 nm的平均直径）的CdSe量子点的纳米级和微米级二氧化硅球。比较未包被的量子点，当使用巯基乙酸（MA）作为稳定剂合成量子点核心时，二氧化硅包被的量子点球的量子产率（QYs）得到提高，而当柠檬酸合成核心时，量子点的量子产率却大大降低。 （CA）作为稳定剂。通过在水溶液中加热二氧化硅包被的量子点，可以进一步改善增强的量子点。尽管二氧化硅包覆的量子点的量子点不高，但这些球体发出明亮的荧光。二氧化硅壳含有许多微孔（〜0.58–0.91 nm），并且可以从二氧化硅球中释放出少量有毒离子（例如Cd2 + ）。但是，与未包被的量子点相比，二氧化硅球中有毒离子的释放率大大降低。

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