“…Because of the volume effect, the quantum size effect, the surface effect and the macroscopic quantum tunnel effect, nanocrystalline NiO is expected to possess many better properties than those of micrometer-sized NiO particles. There are many chemical methods to prepare nanometer NiO, including the precipitation of NiCl 2 , Ni(NO 3 ) 2 or NiSO 4 with NaOH, NH 4 HCO 3 or CO(NH 2 ) 2 [1][2][3][4][5][6][7], the solid reaction of (Ni(Ac) 2 -2H 2 O with H 2 C 2 O 4 [8], etc. Recently, the interest in the preparation of nanometer NiO has been growing.…”