Preparation and Application of MnFe2O4/SiO2/Ag Magnetic Nanocomposites
碩士 === 南台科技大學 === 化學工程與材枓工程系 === 102 === In this study, magnetic plasmonic nanocomposites, multicore MnFe2O4/SiO2/Ag magnetic nanoparticles (MNPs) were successfully prepared by co-precipitation and modified with SiO2 by sol-gel method. Sliver nanoparticles are trained by electroless plating. The eff...
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| Format: | Others |
| Language: | zh-TW |
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| Online Access: | http://ndltd.ncl.edu.tw/handle/aqmcuf |
| Summary: | 碩士 === 南台科技大學 === 化學工程與材枓工程系 === 102 === In this study, magnetic plasmonic nanocomposites, multicore MnFe2O4/SiO2/Ag magnetic nanoparticles (MNPs) were successfully prepared by co-precipitation and modified with SiO2 by sol-gel method. Sliver nanoparticles are trained by electroless plating. The effect of parameters of electroless plating on the properties of nanocomposites were also systematically investigated. The physical and magnetic properties of as-synthesized nanocomposites were characterized by Transmission Electron Microscope (TEM), Energy-dispersive X-ray spectroscopy (EDX), X-ray Diffraction (XRD) and Superconducting Quantum Interference Device (SQUID) measurements. TEM image showed that the size of MnFe2O4/SiO2 nanocomposites is 116 nm and each particle showed a thin SiO2 layer of 14.2 nm. The saturation magnetization of MnFe2O4 NPs is 46.4 emu/g. The MnFe2O4/SiO2/Ag nanocomposites were successively prepared under the addition of 2.4mL of 0.1 M Tollens' reagent and 0.48mL of 1 M glucose solution. From TEM images, silver nanoparticles were anchored homogeneously and tightly onto the silica layer of MnFe2O4/SiO2 nanocomposites. The average size was about 23.2 nm. MNPs coupled to silver nanoparticles by SiO2 layer was also applied to surface enhanced Raman spectroscopy and bactericidal test. The measurement of spectra exhibited that MnFe2O4/SiO2/Ag nanocomposites had high sensitivity to rhodamine 6G molecules at concentration of 0.01 ppm. The analytical enhancement factor (AEF) can reach 4.8×107. MnFe2O4/SiO2/Ag nanocomposites showed bactericidal property toward E.coli.. It can be reused for ten times.
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