Ag@Fe3O4@C-CdTe@SiO2磁性荧光复合微球的制备与光学特征

沈茂; 陈素清; 贾文平; 金燕仙; 梁华定

doi:doi:10.3788/fgxb20173803.0274

发光学报, 2017, 38 (3): 274, 网络出版: 2017-04-10

Ag@Fe₃O₄@C-CdTe@SiO₂磁性荧光复合微球的制备与光学特征

Magnetic and Optical Properties of Ag@Fe₃O₄@C-CdTe@SiO₂ Hybrid Nanoparticles

论文大纲

沈茂陈素清贾文平金燕仙梁华定 ^*

作者单位

台州学院医药化工学院, 浙江台州 317028

多功能纳米粒子贵金属荧光增强核壳结构 multifunctional nanoparticles noble metal enhanced-luminescent core-shell

摘要

先采用一步溶剂热法和水热法制备了碳包覆的Ag@Fe3O4核壳型磁性纳米粒子, 然后通过表面氨基化改性后与巯基乙酸修饰的CdTe量子点反应, 将量子点键合到磁性微球上, 最后在其表面包覆上一层二氧化硅壳层, 制备出具有荧光增强的Ag@Fe3O4@C-CdTe@SiO2磁性荧光复合材料。实验结果表明, 该纳米粒子的平均粒径大约为150 nm, 磁饱和强度为224 A/g (22.4 emu/g), 在室温下具有较好的磁性能。其中Ag@Fe3O4@C-CdTe磁性荧光纳米粒子的荧光强度大于Fe3O4@C-CdTe, 其主要原因是内核为45 nm的 Ag纳米粒子具有表面等离子体共振作用, 能够使其表面或附近的量子点荧光得到增强。

Abstract

Novel hybrid nanoparticles Ag@Fe3O4@C-CdTe@SiO2 were prepared. The synthesis method is included of a Fe3O4 magnetic embedded Ag core (Ag@Fe3O4), an interlayer of carbon modified by PEI to form sufficient amounts of amine functional groups (Ag@Fe3O4@C-PEI), the grafting of CdTe quantum dots (QDs) on the surface of Ag@Fe3O4@C-PEI (Ag@Fe3O4@C-CdTe), and an ordered SiO2 structured shell. The nanocomposites possess an average diameter of 150 nm, orange emission feature and the saturation magnetization of 224 A/g (22.4 emu/g), which has room temperature ferro-magnetism. The photoluminescence measurement reveals that the fluorescence of Ag@Fe3O4@C-CdTe nanostructures in this composite with the Ag cores of about 45 nm has more enhancement compared with that of Fe3O4@C-CdTe nanostructures due to the strong surface plasmonic resonance of the Ag cores.

参考文献

[1] CHEN M L, HE Y J, CHEN X W, et al.. Quantum dots conjugated with Fe3O4-filled carbon nanotubes for cancer-targeted imaging and magnetically guided drug delivery［J］. Langmuir, 2012, 28(47):16469-16476.

[2] ZHANG Y, WANG S N, MA S, et al.. Self-assembly multifunctional nanocomposites with Fe3O4 magnetic core and CdSe/ZnS quantum dots shell［J］. J. Biomed. Mater. Res. A, 2008, 85(3):840-846.

[3] SUN X Y, DING K, HOU Y, et al.. Bifunctional superparticles achieved by assembling fluorescent CuInS2@ZnS quantum dots and amphibious Fe3O4 nanocrystals［J］. J. Phys. Chem. C, 2013, 117(40):21014-21020.

[4] XU Y, KARMAKAR A, WANG D Y, et al.. Multifunctional Fe3O4 cored magnetic-quantum dot fluorescent nanocomposites for RF nanohyperthermia of cancer cells［J］. J. Phys. Chem. C, 2010, 114(11):5020-5026.

[5] STINAFF E A, SCHEIBNER M, BRACKER A S, et al.. Optical signatures of coupled quantum dots［J］. Science, 2006, 311(5761):636-639.

[6] WU W, HE Q G, JIANG C Z. Magnetic iron oxide nanoparticles: synthesis and surface functionalization strategies［J］. Nanoscale Res. Lett., 2008, 3(11):397-415.

[7] NIU P H, LIU B C, LI Y J, et al.. CdTe@SiO2/Ag nanocomposites as antibacterial fluorescent markers for enhanced latent fingerprint detection［J］. Dyes. Pigm., 2015, 119:1-11.

[8] CHANG Y H, LU Y C, CHOU K S. Enhancement of photoluminescence of different quantum dots by Ag@SiO2 core-shell nanoparticles［J］. Mater. Res. Bull., 2013, 48(6):2076-2078.

[9] SUI N, MONNIER V, SALVIA M V, et al.. Magnetic and optical properties of Ag@SiO2-FITC-Fe3O4 hybrid nanoparticles［J］. Mater. Sci. Eng. B, 2014, 182:92-95.

[10] WANG H Y, XU L, ZHANG R Q, et al.. Controllable photoluminescence enhancement of CdTe/CdS quantum dots thin films incorporation with Au nanoparticles［J］. Nanoscale Res. Lett., 2015, 10:128-1-6.

[11] XIA H X, YANG X Q, SONG J T, et al.. Folic acid-conjugated silica-coated gold nanorods and quantum dots for dual-modality CT and fluorescence imaging and photothermal therapy［J］. J. Mater. Chem. B, 2014, 2(14):1945-1953.

[12] JIANG W Q, ZHOU Y F, ZHANG Y L, et al.. Superparamagnetic Ag@Fe3O4 core-shell nanospheres: fabrication, characterization and application as reusable nanocatalysts［J］. Dalton Trans., 2012, 41(15):4594-4601.

[13] ZHU M Y, WANG C J, MENG D H, et al.. In situ synthesis of silver nanostructures on magnetic Fe3O4@C core-shell nanocomposites and their application in catalytic reduction reactions［J］. J. Mater. Chem. A, 2013, 1(6):2118-2125.

[14] SHEN M, JIA W P, YOU Y J, et al.. Luminescent properties of CdTe quantum dots synthesized using 3-mercaptopropionic acid reduction of tellurium dioxide directly［J］. Nanoscale Res. Lett., 2013, 8:253-1-6.

[15] SHEN M, JIA W P, LIN C P, et al.. Facile synthesis of folate-conjugated magnetic/fluorescent bifunctional microspheres［J］. Nanoscale Res. Lett., 2014, 9:558-1-8.

沈茂, 陈素清, 贾文平, 金燕仙, 梁华定. Ag@Fe₃O₄@C-CdTe@SiO₂磁性荧光复合微球的制备与光学特征[J]. 发光学报, 2017, 38(3): 274. SHEN Mao, CHEN Su-qing, JIA Wen-ping, JIN Yan-xian, LIANG Hua-ding. Magnetic and Optical Properties of Ag@Fe₃O₄@C-CdTe@SiO₂ Hybrid Nanoparticles[J]. Chinese Journal of Luminescence, 2017, 38(3): 274.

Ag@Fe₃O₄@C-CdTe@SiO₂磁性荧光复合微球的制备与光学特征

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