Solvothermal Preparation of CaTiO3 Prism and CaTi2O4(OH)2 Nanosheet by a Facile Surfactant-Free Method

Abstract

Calcium titanate (CaTiO₃) with prism-like-shaped and CaTi₂O₄(OH)₂ nanosheet-like morphology were synthesized by a simple solvothermal route without any surfactants. X–ray diffraction (XRD), field emission scanning electron microscopy (FESEM) and Fourier transform infrared spectroscopy (FT-IR) were employed to investigate the microstructure of the samples. The experimental results showed that NaOH concentration played a key role for the formation of CaTiO₃ prisms. With increasing NaOH concentrations, the obtained sample changed from CaTi₂O₅ aggregated particles to CaTi₂O₄(OH)₂ nanosheets, and then to CaTiO₃ prisms. When NaOH concentration was 7 M, CaTiO₃ morphology is mainly composed of regular prisms. A rational mechanism was proposed to illustrate the morphology evolution of the samples synthesized at various NaOH concentrations. And the CaTi₂O₄(OH)₂ interlaminar structure was illustrated.

DOI: http://dx.doi.org/10.5755/j01.ms.21.4.9697