Synthesis of monodispersed and spherical SiO 2 -coated Fe 2 O 3 nanoparticle

Abstract

particleswith the average particle diameter of ~90 nm and extremely narrow size distribution can be obtained at the pHof 11 and the TEOS concentration of 0.68 M, which are found to be the optimum conditions in the present studyin achieving the homogeneous deposition of silica layers on hematite surfaces. Diffuse reflectance UV-Visspectra reveal that the characteristic optical reflectance of α-Fe