Institute of Physics, Polish Academy of Sciences, Warsaw, Poland.
J Phys Condens Matter. 2013 May 15;25(19):194105. doi: 10.1088/0953-8984/25/19/194105. Epub 2013 Apr 24.
A facile sol-gel synthesis of novel ZnO/MgO/Fe2O3 nanoparticles (NPs) is reported and their performance is compared to that of ZnO/MgO. Powder x-ray diffraction (XRD) patterns reveal the crystal structure of the prepared samples. The average particle size of the sample was found to be 4.8 nm. The optical properties were determined by UV-vis absorption and fluorescence measurements. The NPs are stable in biologically relevant solutions (phosphate buffered saline (PBS), 20 mM, pH = 7.0) contrary to ZnO/MgO NPs which degrade in the presence of inorganic phosphate. Superparamagnetic properties were determined with a superconducting quantum interference device (SQUID). Biocompatible and stable in PBS ZnO/MgO/Fe2O3 core/shell composite nanocrystals show luminescent and magnetic properties confined to a single NP at room temperature (19-24 ° C), which may render the material to be potentially useful for biomedical applications.
一种新型 ZnO/MgO/Fe2O3 纳米粒子 (NPs) 的简便溶胶-凝胶合成方法被报道，并将其性能与 ZnO/MgO 进行了比较。粉末 X 射线衍射 (XRD) 图谱揭示了所制备样品的晶体结构。发现样品的平均粒径为 4.8nm。通过紫外-可见吸收和荧光测量确定了光学性质。与在存在无机磷酸盐的情况下会降解的 ZnO/MgO NPs 相反，NPs 在生物相关溶液（磷酸盐缓冲盐水 (PBS)，20mM，pH=7.0）中稳定。超导量子干涉装置 (SQUID) 确定了超顺磁性。在 PBS 中具有生物相容性和稳定性的 ZnO/MgO/Fe2O3 核/壳复合纳米晶体在室温（19-24°C）下显示出局限于单个 NP 的发光和磁性性质，这可能使该材料在生物医学应用中具有潜在用途。
