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The NiCo@Pt nanoallys from icosahedrons to hollow spheres are synthesized through the element lithographic process based on NiCo nanoicosahedrons. The morphology, structure, magnetic property, and its synergistic photocatalysis of nano-ZnO have been investigated by scan electron microscopy, transmission electron microscopy, X-ray diffraction analysis, energy dispersive X-ray analysis, X-ray photoelectron spectroscopy, vibration sample magnetometry measurement, and UV–vis spectroscopy. The as-prepared NiCo@Pt magnetic hollow nanospheres have the UV- and visible-light-driven synergistic photocatalysis for ZnO toward the degradation of dye wastewater. Especially the different coorporation photocatalysis can be observed under UV- and UV-filtered visible-light illumination, in which Ni45Co37@Pt18 under UV-light and Ni31Co26@Pt43 under visible-light exhibit the strongest enhancement for the photocatalytic reactivity of ZnO, respectively. The coercivity Hc and saturation magnetization Ms first decrease with the ...

New dimensional NiCo alloy icosahedral nanocrystals with controllable size have been first reported and synthesized through an Ostwald ripening process in a template-absent solvothermal reaction system. The proposed synthesis is corroborated by scanning electron microscopy (SEM), transmission electron microscopy (TEM), X-ray diffraction analysis (XRD), energy-dispersive X-ray spectroscopy (EDX), and X-ray photoelectron spectroscopy (XPS). The as-obtained NiCo icosahedral nanocrystals exhibit the size- and component-dependent magnetic behaviors. The coercivity (H(c)) depends on both the magnetocrystalline and structure anisotropy, and the saturation magnetizations (M(s)) decided by the content of Co. H(c) decreases from 189.02 to 147.95 Oe with the increase of the icosahedral NCs size from 200 to 850 nm. Especially, the H(c) of the icosahedral NCs at 157.38 Oe is higher than that of nanospheres at 104.02 Oe. In addition, M(s) and H(c) increased with the increasing Co content. It can be an ideal building block for applications in magnetic media, sensors, and other devices.