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Monodisperse micro-nano nickel powders have been prepared by chemical reduction of aqueous solution NiSO 4 , NaOH and NaH 2 PO 2 , and the influence of pH value and initial concentration of NiSO 4  on the size, structure, morphology and microwave absorption properties of nickel powders were investigated. The crystal structure of nickel powders was characterized by X-ray diffraction (XRD). And the morphology of the as-synthesized products was characterized by scanning electron microscopy (SEM) and transmission electron microscopy (TEM). The microwave absorption properties of the composite materials were characterized by network analyzer. The result indicates that the growth of nickel powders produced by NiSO 4  and NaH 2 PO 2  at alkaline condition deeply relies on pH value and initial concentration of NiSO 4  in reaction system. Different sizes of nickel powders with the diameter of 1.5[Formula: see text][Formula: see text]m and 180[Formula: see text]nm were produced at the pH value of 10 and initial concentration of NiSO 4  at 0.5[Formula: see text]mol/L. The network analyzer showed definite microwave absorption properties of nickel powders with different sizes in the range of 0.5–18.0[Formula: see text]GHz.

Synthesis and electromagnetic absorption properties of micro-nano nickel powders prepared with liquid phase reduction method