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多孔SiO2包裹的多元核—壳结构的合成
Synthesis of Multiple Core/Shell Nanostructures Encapsulated by Mesoporous SiO2
【作者】 宋英英；
【导师】 曹雪波；
【作者基本信息】 苏州大学 ， 无机化学， 2010， 硕士
【摘要】 制备了CdTe/ZnO@SiO2核-壳纳米复合物,并使用TEM、SEM、HRTEM、XPS、XRD、BET、SAXS、UV、PL等测试方法对其微观形貌,结构及光学性质进行了表征,此复合物对金属离子具有优良的荧光响应性。通过使用氨基（APTS）来修饰硅壳表面并连接上异硫氰酸荧光素（FITC）,我们成功制备了CdTe@SiO2/FITC复合物。采用TEM、SEM、BET、SAXS、UV、PL等测试方法对所得产物进行了表征。发现产物的分散性良好,尺寸均一;并且其双荧光性质在检测方面具有很好的应用前景。通过在硅壳表面修饰硅烷偶联剂,然后聚合具有温度响应性的异丙基丙烯酰胺（PNIPAm）,合成了Fe3O4@SiO2/PNIPAm。对产物的形貌、磁性及作为载体方面的应用进行了研究,发现产物的分散性良好、尺寸均一;且聚合反应对产物的磁性影响不大。但还需进一步完善实验条件,以便于其作为载体具有更好的的应用价值。通过构建各种双功能纳米复合结构,成功的克服了单一组分纳米晶在性质和功能方面的限制。所制备的CdTe/ZnO@SiO2、CdTe@SiO2 /FITC和Fe3O4@SiO2/PNIPAm作为新型的结构、功能材料,将在光、电、磁等领域展现出广泛的应用前景。
【Abstract】 We demonstrated the encapsulation of CdTe quantum dots and ZnO nanorods with a layer of mesoporous SiO2 shell for the purpose of integrating dual-emission property into one common nanostructure.The morphology, structure, and optical properties were characterized by means of TEM, SEM, HRTEM, XPS, XRD, BET, SAXS, UV, and PL.The nanocomposites had ultrasensitive fluorescence response to metal ions. CdTe@SiO2/FITC nanocomposites were synthesized by the encapsulation of CdTe QDs with SiO2 shell, the modification of SiO2 shell with APTS, and the connection of FITC. The nanocomposites were characterized by means of TEM, SEM, BET, SAXS, UV, and PL. The results showed that the products were monodispersed and uniform, and the biluminescent properties of the products would have a good prospect in detection.By modifying the surface of the silica shell with silane coupling agents and polymerizing temperature-responsive N-isopropylacrylamide（PNIPAm）, we synthesized nanocomposites of Fe3O4@SiO2/PNIPAm. The morphology, magnetism, and their application as the carrier were studied. It is found that the products were monodispersed and uniform; and the polymerization has little effect on the magnetism of the nanocomposites. But the improvement of the experimental conditions was still needed to impart the nanocomposites better carrier properties.As new type of structural and functional materials, the nanocomposites of CdTe/ZnO@SiO2, CdTe@SiO2 /FITC, and Fe3O4@SiO2/PNIPAm would show a wide range of applications in optical, electrical, and magnetic fields.
【Key words】 Nanocomposites； Quantum dots(QDs)； Mesoporous silica； Temperature-responsive；