Preparation of SiO2 coated Ce2S3 red pigment with improved thermal stability

SiO2 coated Ce2 S3 red pigment was prepared in ethanol/H2 O system via sol-gel method and TEOS were used as silica sources.X-ray diffraction(XRD),scanning electron microscopy(SEM),energy dispersive spectroscopy(EDX),UV-visible spectrophotometer and automatic colorimeter were used to investigate the properties of the samples.The results showed that the compact SiO2 film formed on the surface of Ce2 S3 pigment at a cerium silicon molar ratio of 2.The thermal stability temperature of Ce2 S3 pigment was improved to 450 oC after SiO2 coating.In addition,the color of Ce2 S3 pigment was not affected significantly through coating colorless and transparent SiO2 and it could be used as safe red pigment in higher temperature fields.     

无助剂水热合成CdS微球

利用水热合成法,在不使用任何辅助剂的条件下,制备出形貌均一的CdS微球。利用X射线衍射(XRD)、扫描电镜(SEM)对样品的结构和形貌进行了表征。结果表明水热合成避免了S2-离子的氧化,在适当的保温温度和保温时间下得到了具有明显量子尺寸效应的表面光滑的CdS微球。