Wet chemical synthesis of redispersible crystalline BaTiO3 in organic medium

Abstract

Redispersible crystalline BaTiO3 nanoparticles were prepared by wet chemical method from alkoxide-hydroxide precursor in the presence of ethylene diamine. Crystal structure, crystallite size and morphology of BaTiO3 nanoparticles were characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM) and transmission electron microscopy (TEM). The crystallite sizes of the BaTiO3 nanoparticles were found to be in the range 24-43 nm, while the average particle sizes, measured by dynamic light scattering method and SEM were in the range 55-120 nm. The dispersibility of BaTiO3 nanoparticles in organic media was remarkably enhanced by preparing them under the presence of ethylene diamine. The dispersion stability of the nanoparticles was higher in the organic media such as methanol and N,N-dimethyl foramide with relatively high dielectric constants than organic media such as isopropyl alcohol, methyl isobutyl ketone and cyclohexanone with low dielectric constants. (C) 2007 Published by Elsevier B.V