Superparamagnetic NiO-doped mesoporous silica flower-like microspheres with high nickel content

다국어 초록 (Multilingual Abstract)

Morphology oriented synthesis of metal oxide doped silica structures have fascinating properties whichneeded to be explored extensively. In this work, NiO doped silica microsphere with beautifulflower-likemorphology has been achieved by adopting a facile surfactant-assisted synthetic route using CTAB-ammonia in H2O–ethanol mixed solvent media. The sol–gel synthesis with effective variations of Ni/Si ratiosup to 7.0, followed by a simple hydrothermal treatment and subsequent calcination leads to the formation ofNiO–silica mesostructures with high nickel content. Detailed structural and elemental characterizations byusing powder X-ray analysis (XRD), scanning electron (SEM) and transmission electron microscopy (TEM),N2 adsorption–desorption, X-ray photoelectron spectroscopy (XPS) revealed that single cubic phase NiOdoped mesoporous silica microspheres (for Ni/Si = 5:1 and 7:1) with good surface area (169 and 205 m2 g 1for sample with Ni/Si = 7:1 and 5:1, respectively) and pore width 3–5 nm, have been formed with 3Dflower-like shape and 500–600 nm particle size. These NiO–silica microspheres containing high Ni content up to 76wt% have shown excellent paramagnetic properties at room temperature.

참고문헌 (Reference)

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