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

• Published in: Journal of rare earths Vol. 33; no. 8; pp. 892 - 897
• Main Author: 刘俊亮 颜雷鸣 陈秀雷 王绳芸 张明 田长安
• Format: Journal Article
• Language: English
• Published: Elsevier B.V 01.08.2015
• Subjects: ceria; Cerium oxide; Evolution; Formations; hollow structures; nano powders; Nanostructure; Ostwald ripening; Ostwald熟化; Rare earth metals; rare earths; Self assembly; Solvents; solvothermal reaction; 正多面体; 氧化铈; 混合溶剂; 溶剂热法; 直接合成; 空心结构; 纳米粉体; nano powders; ceria; hollow structures; solvothermal reaction; rare earths
• ISSN: 1002-0721; 2509-4963
• DOI: 10.1016/S1002-0721(14)60501-9

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.