Preparations and characterizations of γ-Ce2S3@SiO2 pigments from precoated CeO2 with improved thermal and acid stabilities
Abstract
A series of γ-Ce2S3@SiO2 pigments are prepared successfully by sulfurizing their corresponding precoated CeO2 with different thicknesses of SiO2 shell. Properties of the samples are investigated by X-ray diffraction (XRD), transmission electron microscopy (TEM), thermogravimetric (TG) analysis and a spectrophotometer. The results show that when a well controlled thickness of SiO2 coated CeO2 is used as a precursor, γ-Ce2S3 nanoparticles with excellent properties are obtained. With the shell thickness increasing, the colours of the samples are expanded from red to orange to yellow. At the same time, the thermal and acid stabilities are also improved gradually.