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

刘俊亮^1,2，颜雷鸣¹，陈秀雷¹，王绳芸¹，张明^1,2,3，田长安⁴

1. School of Chemistry and Chemical Engineering, Yangzhou University2. Key Laboratory of Environmental Materials and Engineering of Jiangsu Province3. Testing Center, Yangzhou University4. Department of Chemistry and Materials Engineering, Hefei University

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.

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