Preparation and Characterization of α-Ni(OH)_2/SiO_2 Submicrosphere and α-Ni(OH)_2 Hollow Submicrosphere

The nearly monodisperse SiO2 submicrospheres with uniform size(270nm) were prepared by the hydrolysis of TEOS.Then the SiO2 submicrospheres were coated with α-Ni(OH)2 nanoflakes by a new solution growth method.The Ni(OH)2 nanoflakes were synthesized by a solution process using hydrofluoric acid solution as nickel ion ligand to form nickel-fluoro complex,NH3 aqueous solution as OH-supplier and also supplemental nickel ion ligand.The coating thickness is increased with coating times.It is only 35nm for coating once.After coating three times,the coating thickness is increased to about 100nm.The α-Ni(OH)2 hollow submicrospheres are obtained after subsequent removal of the core particles by NaOH solution(20wt%) at 40℃ for 24h.BET calculation shows that the surface area of the Ni(OH)2 hollow spheres is 141.06m2/g.