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Sonochemical synthesis, structure and magnetic properties of air-stable nanoparticles

机译:空气稳定纳米粒子的声化学合成,结构和磁性

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摘要

Air-stable nanoparticles of Fe_3O_4/Au were prepared via sonolysis of a solution mixture of hydrogen tetrachloroaureate(III) trihydrate (HAuCl_4) and (3-aminopropyl)triethoxysilane (APTES)-coated Fe_3O_4 nanoparticles with further drop-addition of sodium citrate. The Fe_3O_4/Au nanoparticles were characterized by x-ray powder diffraction (XRD), ultraviolet-visible spectroscopy (UV-vis), scanning electron microscopy (SEM) with energy dispersive spectroscopy (EDS), transmission electron microscopy (TEM), vray photoelectron spectroscopy (XPS) and superconducting quantum interference device (SQUID) magnetometry. Nanoparticles of Fe_3O_4/Au obtained under appropriate conditions possess a very high saturation magnetization of about 63 emu g~(-1) and their average diameter is about 30 nm.
机译:通过对四氯金酸氢盐(III)三水合物(HAuCl_4)和(3-氨基丙基)三乙氧基硅烷(APTES)包覆的Fe_3O_4纳米颗粒的溶液混合物进行超声分析,并进一步滴加柠檬酸钠,制备了空气稳定的Fe_3O_4 / Au纳米颗粒。 Fe_3O_4 / Au纳米粒子的特征在于X射线粉末衍射(XRD),紫外可见光谱(UV-vis),扫描电子显微镜(SEM)和能量色散光谱(EDS),透射电子显微镜(TEM),Vray光电子光谱学(XPS)和超导量子干涉仪(SQUID)磁力计。在适当条件下获得的Fe_3O_4 / Au纳米粒子具有很高的饱和磁化强度,约为63 emu g〜(-1),平均直径约为30 nm。

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