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標題: To Study the Characteristics of Fe Oxide(Core)/Au(Shell) Nanoparticles by Ultra-low Field Nuclear Magnetic Resonance
作者: Yao-Wei Yeh
關鍵字: 鐵核金殼磁性奈米粒子
Fe Oxide(Core)/Au(Shell) Nanoparticle
Low Field NMR
Superparamagnetic iron oxide nanoparticle
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摘要: 本研究使用之鐵核金殼磁性奈米粒子(γ-Fe2O3(Core)/Au(Shell))以反膠束法合成,以三氧化二鐵核心及金殼構成。並使用以下技術分析鐵核金殼磁性奈米粒子的特性,如穿透光譜(Spectrometer)判斷合成前後之樣品含有金的成分、X光繞射分析(X-ray Diffraction, XRD)分析樣品所含成分為三氧化二鐵和金、磁滯曲線(Magnetic Hysteresis Curve, M-H Curve)可知所合成樣品的飽和磁化率為4.5×10−4 emu/g、雷射粒徑分析儀(Laser Diffraction Particle Size Analyzer, DLS)測定其平均粒徑為 28 ± 6.26 nm、穿透式電子顯微鏡(Transmission Electron Microscope, TEM)觀察其表面形貌以及感應耦合電漿質譜分析(Inductivity Coupled Plasma-Mass Spectrometer, ICP-MS)樣品所含γ-Fe2O3為0.1 mM、金為0.138 mM。   超順磁氧化鐵磁性奈米粒子(Fe3O4)已被應用於高磁場核磁共振(主磁場 > 1.5 T)的T2對比劑,因為磁特性使其在T1的對比效果不顯著,其r2/r1比值為422,而鐵核金殼磁性奈米粒子為γ-Fe2O3磁性奈米粒子外圍包覆一層金膜,即可提升其在T1的對比效果,其r2/r1比值為20.07。並隨著主磁場降低至100 μT,鐵核金殼磁性奈米粒子的r2/r1比值更降低為0.43,可見其於低磁場下是更顯著的T1對比劑。而鐵核金殼磁性奈米粒子在低磁場時以532 nm 綠光雷射誘發局部表面電漿共振效應(Localized Surface Plasma Resonance, LSPR),影響局部粒子表面磁場改變,使T1時間縮短並提升r1的現象,未來可結合自體螢光之抗體並應用於生醫檢測相關研究。
The γ-Fe2O3(Core)/Au(Shell) magnetic nanoparticles have been synthesized by a reverse micelle method. The nanoparticles composed byγ-Fe2O3 and Au, as determined by spectrometer, x-ray diffraction (XRD) and transmission electron microscope (TEM). The average nanoparticle size is 28 ± 6.26 nm, as determined by laser diffraction particle size analyzer (DLS). The molarity of γ-Fe2O3 and Au is 0.1 mM and 0.138 mM in freshly synthesized γ-Fe2O3(Core)/Au(Shell) magnetic nanoparticles, as determined by inductivity coupled plasma-mass spectrometer (ICP-MS). And the saturation magnetization is 4.5 emu g-1, as determined by superconducting quantum interference device (SQUID).   Superparamagnetic iron oxide nanoparticles (Fe3O4) is used as T2 contrast agents in high field nuclear magnetic resonance (NMR) which the main magnetic field is over 1.5 T. The r2/r1 ratio of Fe3O4 is 422 in 7 T NMR. But r2/r1 ratio of γ-Fe2O3(Core)/Au(Shell) magnetic nanoparticles is 20.07. It may potentially be used as T1 agents at 7 T NMR. With the decrease of the main magnetic field to 100 μT, the r2/r1 ratio is also decreased to 0.43. It has stronger T1 contrast effect in low field NMR. Because of the Au shell, it will induce localized surface plasma resonance (LSPR) when using 532 nm green laser irradiate nanoparticles. LSPR caused the local magnetic field changing and promote the T1 contrast effect. It is expected to be applied to biomedical detection.
文章公開時間: 2018-08-20
Appears in Collections:物理學系所



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