Department of Emerging Materials Science, DGIST, Daegu 42988, South Korea.
Dalton Trans. 2017 Feb 14;46(7):2303-2309. doi: 10.1039/c6dt04486g.
A novel and efficient chemical approach for the synthesis of FeO/Au core/satellite nanocubes is reported. In a one-pot reaction, metallic Au nanodots were successfully deposited on the polyvinylpyrrolidone (PVP) functionalized FeO nanocube surface for the fabrication of a core/satellite structure (FeO/Au) by the reduction of HAuCl using ammonia. Transmission electron microscopy and energy dispersive spectroscopy mapping revealed that small Au nanodots of about 2 nm average size decorated the surface of FeO nanocubes. X-ray diffraction data was used to confirm the formation of both the phases of a cubic inverse spinel structure for FeO and a bcc structure for Au in the core/satellite structure of FeO/Au nanocubes. The magnetic properties of the seed FeO nanocubes and FeO/Au core/satellite nanocubes were measured by using a superconducting quantum interference device at 300 K. For biological application purposes, the as-synthesized FeO/Au core/satellite nanocubes were functionalized by cysteamine followed by successful immobilization of streptavidin protein as confirmed through the fluorescence confocal microscopy images.
一种新颖高效的化学方法被用于合成 FeO/Au 核壳纳米立方体。在一锅反应中，通过用氨还原 HAuCl，成功地将金属 Au 纳米点沉积在具有聚维酮（PVP）功能的 FeO 纳米立方体表面上，从而制备出核壳结构（FeO/Au）。透射电子显微镜和能量色散谱图显示，平均尺寸约为 2nm 的小 Au 纳米点装饰在 FeO 纳米立方体的表面上。X 射线衍射数据用于确认 FeO/Au 核壳纳米立方体中立方反尖晶石结构的两相和 Au 的 bcc 结构的形成。通过在 300K 下使用超导量子干涉装置测量了种子 FeO 纳米立方体和 FeO/Au 核壳纳米立方体的磁性。为了生物应用的目的，通过半胱氨酸对所合成的 FeO/Au 核壳纳米立方体进行功能化，然后通过荧光共聚焦显微镜图像证实成功固定了链霉亲和素蛋白。
