Fabrication of magnetic luminescent nanocomposites by a layer-by-layer self-assembly approach
Fabrication of magnetic luminescent nanocomposites by a layer-by-layer self-assembly approach
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DOI：
10.1021/cm049422o
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发表时间：
2004-10-19
影响因子：
8.6
通讯作者：
Li, TJ
中科院分区：
文献类型：
--
作者：
Hong, X;Li, J;Li, TJ
通过层层组装法制备了磁性发光纳米复合材料。以8.5 nm的Fe 3 O 4磁性纳米粒子为模板，制备了CdTe量子点/纳米晶多层膜。通过改变纳米颗粒之间的多层膜层数和量子点/量子点沉积周期数，分别制备了Fe 3 O 4/PEn/CdTe和Fe 3 O 4/（PE 3/CdTe）（n）两种磁性发光纳米复合材料。组装过程通过微电泳和紫外可见光谱进行监测。通过透射电子显微镜研究了纳米复合材料的形貌和尺寸。LbL技术制备磁性发光纳米复合材料具有一定的优势，可以调节其性能。结果表明，选择一定数量的插入层和CdTe量子点的负载可以优化复合材料的光致发光性能。此外，纳米复合材料可以很容易地分离和收集在一个外部磁场。由于纳米复合材料优异的磁性，它为生物医学和生物技术中的发光标签应用提供了一种新颖的技术创新，例如快速、方便的体外分离或体内定点运输。
Magnetic luminescent nanocomposites were prepared via a layer-by-layer (LbL) assembly approach. The Fe3O4 magnetic nanoparticles of 8.5 nm were used as a template for the deposition of the CdTe quantum dots (QDs)/polyelectrolyte (PE) multilayers. The number of polyelectrolyte multilayers separating the nanoparticle layers and the number of QDs/ polyelectrolyte deposition cycles were varied to obtain two kinds of magnetic luminescent nanocomposites, Fe3O4/PEn/CdTe and Fe3O4/(PE3/CdTe)(n), respectively. The assembly processes were monitored through microelectrophoresis and UV-vis spectra. The topography and the size of the nanocomposites were studied by transmission electron microscopy. The LbL technique for fabricating magnetic luminescent nanocomposites has some advantages to tune their properties. It was found that the selection of a certain number of the inserted polyelectrolyte interlayers and the CdTe QDs loading on the nanocomposites could optimize the photoluminescence properties of the nanocomposites. Furthermore, the nanocomposites could be easily separated and collected in an external magnetic field. It provides a novel technological innovation for luminescent tagging applications in biomedicine and biotechnology, such as rapid, convenient separation in vitro or site-specific transport in vivo due to the excellent magnetic properties of the nanocomposites.