Silica-polymer dual layer-encapsulated quantum dots with remarkable stability.

Silica-polymer dual layer-encapsulated quantum dots with remarkable stability.
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DOI:
10.1021/nn1017044
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发表时间:
2010-10-26
期刊:
影响因子:
17.1
通讯作者:
Gao X
Gao X
中科院分区:
材料科学1区
文献类型:
--
作者:
Hu X;Gao X

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半导体量子点(QD)由于其高亮度、多重能力和光稳定性而成为重要的荧光探针。然而,定量和体内成像的应用因其对化学环境和潜在毒性的敏感性而受到阻碍。在这里,我们报告了一个令人惊讶的发现,即二氧化硅和两亲性聚合物的组合可以在包括强酸性溶液在内的广泛化学条件下稳定 CdSe/ZnS QD,这是单独使用的任何当前封装技术(例如,巯基化合物、二氧化硅和两亲性聚合物)所无法实现的。我们进一步展示了这些超稳定量子点作为 pH 传感应用中的内参的用途。我们预计这项工作将为体内和定量应用带来令人兴奋的机会,并可能有助于解决量子点的毒性问题。
Semiconductor quantum dots (QDs) are important fluorescent probes due to their high brightness, multiplexing capability, and photostability. However, applications in quantitative and in vivo imaging are hampered by their sensitivity to chemical environments and potential toxicity. Here we report a surprising finding that the combination of silica and amphiphilic polymer can stabilize CdSe/ZnS QDs in a broad range of chemical conditions including strong acidic solutions, which is unavailable for any of the current encapsulation technologies (e.g., mercapto compounds, silica, and amphiphilic polymers) used alone. We further demonstrate the use of these ultrastable QDs as internal references in pH sensing applications. We expect this work will open exciting opportunities for in vivo and quantitative applications, and may help solve the toxicity problem of QDs.
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