Enhanced Photostability from CdSe(S)/ZnO Core/Shell Quantum Dots and Their Use in Biolabeling
Enhanced Photostability from CdSe(S)/ZnO Core/Shell Quantum Dots and Their Use in Biolabeling
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DOI：
10.1002/ejic.201000790
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发表时间：
2011-02-01
影响因子：
2.3
通讯作者：
Schneider, Raphael
中科院分区：
文献类型：
--
作者：
Aldeek, Fadi;Mustin, Christian;Schneider, Raphael
我们报告的制备和合金化的CdSe（S）纳米晶体，这是由ZnO壳覆盖的物理和结构表征。在水热条件下，以3-巯基丙酸（MPA）为催化剂，氯化镉（CdCl 2）和亚硫酸氢钠（NaHSe）为原料，制备了CdSe（S）量子点。硫的掺入产生于生长的QD表面上的表面介导的MPA水解。水分散性CdSe（S）量子点成功地被通过Zn（OAM）碱性水解获得的ZnO壳覆盖（2）。透射电子显微镜（TEM）成像和粉末X射线衍射（XRD）分析的实验结果表明，核/壳结构的CdSe（S）/ZnO量子点具有非常小的直径（约100 nm）。2.8 nm），并表现出面心立方晶体结构。结果表明，核壳结构的CdSe（S）/ZnO量子点比核结构的CdSe（S）量子点具有更高的光稳定性。CdSe（S）/ZnO量子点作为荧光生物标记物具有潜在的应用前景，并已成功地用于奥氏雪旺氏菌生物膜的成像。
We report on the preparation and on the photophysical and structural characterization of alloyed CdSe(S) nanocrystals, which are covered by a ZnO shell. CdSe(S) QDs were prepared by reaction of CdCl2 with NaHSe in the presence of 3-mercaptopropionic acid (MPA) under hydrothermal conditions. The incorporation of sulfur arises from the surface-mediated MPA hydrolysis on the growing QD surface. Water-dispersible CdSe(S) QDs were successfully capped with a ZnO shell obtained by basic hydrolysis of Zn(OAc)(2). The experimental results from transmission electron microscopy (TEM) imaging and powder X-ray diffractometry (XRD) analyses indicate that the core/shell CdSe(S)/ZnO QDs have a very small diameter (ca. 2.8 nm) and exhibit a face-centered cubic crystal structure. Our results show that core/shell CdSe(S)/ZnO QDs have a higher photostability than CdSe(S) cores. CdSe(S)/ZnO QDs have potential applications as fluorescent biological labels and were successfully used for imaging Schewanella oneidensis bacterial biofilms.