Faculty of Science, Physics Department, King Abdulaziz University , Jeddah, Saudi Arabia.
Langmuir. 2013 Oct 22;29(42):13095-101. doi: 10.1021/la403158d. Epub 2013 Oct 10.
Here, we report the synthesis, characterization, and properties of Fe/Fe3O4 core-shell nanocubes prepared via a simple route. It includes NaBH4 reduction of FeCl3 in an ethylene glycol solution in the presence of 2-mercaptopropionic acid (surfactant) and trisodium citrate (cosurfactant) followed by surface oxidation with trimethylamine N-oxide. The morphology and structure of Fe/Fe3O4 core-shell nanocubes were characterized using transmission electron microscopy (TEM), high-resolution TEM, selected area electron diffraction, X-ray powder diffraction, and X-ray photoelectron spectroscopy. All of the methods confirm a Fe/Fe3O4 core-shell structure of nanocubes. Magnetic measurements revealed that the Fe/Fe3O4 core/shell nanocubes are superparamagnetic at 300 K with a saturation magnetization of 129 emu/g. The T2 weighted imaging and the T2 relaxation time showed high MRI contrast and sensitivity, making these nanocubes viable candidates as enhanced MRI contrast agents.
在这里，我们报告了通过一种简单的方法制备的 Fe/Fe3O4 核壳纳米立方体制备、表征和性能。它包括在 2-巯基丙酸（表面活性剂）和柠檬酸三钠（助表面活性剂）存在下，将 FeCl3 在乙二醇溶液中用硼氢化钠还原，然后用三甲基氧化胺进行表面氧化。Fe/Fe3O4 核壳纳米立方体制备的形貌和结构通过透射电子显微镜（TEM）、高分辨率 TEM、选区电子衍射、X 射线粉末衍射和 X 射线光电子能谱进行了表征。所有的方法都证实了纳米立方体制备的 Fe/Fe3O4 核壳结构。磁测量表明，Fe/Fe3O4 核壳纳米立方在 300 K 时具有超顺磁性，饱和磁化强度为 129 emu/g。T2 加权成像和 T2 弛豫时间显示出高的 MRI 对比和灵敏度，使得这些纳米立方成为增强 MRI 造影剂的可行候选物。
