Investigation on the synthesis procedure of ultrafine monodispersed BaTiO3 powders by solvothermal method

Abstract

Monodispersed BaTiO3 nanoparticles with an average grain size of 3-5nm were obtained by a convenient one-step solvothermal method. In this method, the crucial step to achieve ultrafine BaTiO3 nanoparticles is the control of hydrolysis of Ti(OC4H9)4 by Diethylene glycol (DEG). DEG can strongly inhibit the hydrolysis procedure and prevent the grain growth of BaTiO3 nanoparticles. Ba(OH) 2·8H2O provides H2O source and alkaline environment. Polyvinyl pyrrolidone (PVP) is used as surfactant. The as-prepared monodispersed BaTiO3 nanoparticles were characterized by X-ray diffraction (XRD), transmission electron microscopy (TEM), BET-specific surface area measurement, fouriertransform infrared (FT-IR) spectrum and X-ray photo-electron spectroscopy (XPS). The influence of concentration, temperature, time and the importance of PVP were explored to investigate the growth-up mechanism of the BaTiO3 nanoparticles. © 2013 The Ceramic Society of Japan. All rights reserved.