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首页> 外文期刊>Nanotechnology >Stable aqueous ZnS quantum dots obtained using (3-mercaptopropyl) trimethoxysilane as a capping molecule
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Stable aqueous ZnS quantum dots obtained using (3-mercaptopropyl) trimethoxysilane as a capping molecule

机译：使用（3-巯基丙基）三甲氧基硅烷作为封端分子获得的稳定的ZnS水性量子点

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We have examined the synthesis and stability of ZnS quantum dots (QDs) using an all-aqueous route at pH = 12 with (3-mercaptopropyl) trimethoxysilane (MPS) as the capping molecule. The MPS-capped ZnS QDs obtained were well dispersed with a particle size around 5 nm and a cubic zinc blende crystalline structure. The QDs exhibited optimal photoluminescence (PL) emission when the MPS:Zn:S ratio was between 1/4:2:1 and 1/2:2:1. Compared with the earlier obtained ZnS QDs caped with 3-mercaptopropionic acid (MPA), the MPS-capped ZnS QDs exhibited a similar, high quantum yield, 42% and 25% for MPS:Zn:S = 1/2:2:1 and 1/4:2:1, respectively, but much better photostability. With the MPS:Zn:S ratio of 1/4:2: 1, we showed that at room temperature and under the normal laboratory lighting conditions, the MPS-capped QDs were able to maintain their PL intensity for more than 50 days without degradation. We further showed that the MPS-capped QDs were stable not only in their synthesis solution but also in deionized (DI) water and in phosphate buffer saline (PBS) solution. The QDs with MPS:Zn:S = 1/2:2:1 were able to stay at 50 degrees C for more than 20 h without degrading the PL intensity. They were also stable under continuous UV exposure for 3 h. With the high quantum yield and significantly improved photostability, the MPS-capped ZnS QDs could be good imaging tools for many biological applications.
机译：我们已经使用（3-巯基丙基）三甲氧基硅烷（MPS）作为封端分子，在pH = 12的全水途径下研究了ZnS量子点（QDs）的合成和稳定性。得到的经MPS封端的ZnS QD分散良好，粒径约为5 nm，具有立方锌混合晶体结构。当MPS：Zn：S之比在1/4：2：1和1/2：2：1之间时，量子点显示出最佳的光致发光（PL）发射。与较早获得的以3-巯基丙酸（MPA）封端的ZnS量子点相比，封有MPS的ZnS量子点具有相似的高量子产率，MPS：Zn：S = 1/2：2：1的42％和25％和1/4：2：1，但光稳定性更好。当MPS：Zn：S比率为1/4：2：1时，我们表明在室温和正常实验室照明条件下，加有MPS的QD能够保持其PL强度超过50天而不会降解。 。我们进一步表明，加有MPS的QD不仅在其合成溶液中而且在去离子（DI）水和磷酸盐缓冲盐水（PBS）溶液中均稳定。 MPS：Zn：S = 1/2：2：1的QD能够在50摄氏度下保持超过20小时，而不会降低PL强度。它们在连续的紫外线照射下3小时也很稳定。凭借高量子产率和显着改善的光稳定性，MPS覆盖的ZnS QD可以成为许多生物学应用的良好成像工具。

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