Direct synthesis of hollow polyhedral ceria nano powders via a template-free mixed solvothermal route  

作　　者：刘俊亮 颜雷鸣 陈秀雷 王绳芸 张明 田长安 

机构地区：[1]School of Chemistry and Chemical Engineering, Yangzhou University [2]Key Laboratory of Environmental Materials and Engineering of Jiangsu Province [3]Testing Center, Yangzhou University [4]Department of Chemistry and Materials Engineering, Hefei University

出　　处：《Journal of Rare Earths》2015年第8期892-897,共6页稀土学报（英文版）

基　　金：supported by the National Natural Science Foundation of China(51103125,51102073);China Postdoctoral Science Foundation(2015M570483);the Priority Academic Program Development of Jiangsu Higher Education Institutions(Chemistry)

摘　　要：Novel mono-dispersed hollow polyhedral ceria nano powders with the average particle size of 250 nm were directly synthesized via a simple template-free mixed solvothermal method by using water-ethanol as the solvent. The formation of such hollow structure with the regular polyhedral particle shape was based on a solvent-controlled Ostwald ripening coupled self-templating process. The mixed solvent promoted the formation of the regular solid particles at the beginning of solvothermal reaction and drove the Ostwald ripening as the reaction went on. Owing to the Ostwald ripening and self-assembly of nano crystallites, ceria nano particles converted into the hollow structures with regular polyhedral shape during the solvothermal process just by increasing solvothermal reaction time. The as-synthesized hollow ceria nano powders exhibited strong absorptions in the UV-vis spectrum and the evaluated energy band gaps increased according to the shape evolution and size decrease of the nano particles, which demonstrated obvious blue shift effects.Novel mono-dispersed hollow polyhedral ceria nano powders with the average particle size of 250 nm were directly synthesized via a simple template-free mixed solvothermal method by using water-ethanol as the solvent. The formation of such hollow structure with the regular polyhedral particle shape was based on a solvent-controlled Ostwald ripening coupled self-templating process. The mixed solvent promoted the formation of the regular solid particles at the beginning of solvothermal reaction and drove the Ostwald ripening as the reaction went on. Owing to the Ostwald ripening and self-assembly of nano crystallites, ceria nano particles converted into the hollow structures with regular polyhedral shape during the solvothermal process just by increasing solvothermal reaction time. The as-synthesized hollow ceria nano powders exhibited strong absorptions in the UV-vis spectrum and the evaluated energy band gaps increased according to the shape evolution and size decrease of the nano particles, which demonstrated obvious blue shift effects.

关 键 词：CERIA hollow structures nano powders solvothermal reaction rare earths 

分 类 号：TB383.1[一般工业技术—材料科学与工程] TB383.3