Controllable Synthesis and Photoluminescence of Single-Crystalline BaHfO3 Hollow Micro- and Nanospheres

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• 作者：Tiannan Ye ; Zhenghong Dong ; Yongnan Zhao ; Jianguo Yu ; Fengqin Wang ; Shukun Guo ; Yongcun Zou
• 刊名：Langmuir
• 出版年：2011
• 出版时间：July 19, 2011
• 年：2011
• 卷：27
• 期：14
• 页码：8878-8884
• 全文大小：982K
• 年卷期：v.27,no.14(July 19, 2011)
• ISSN：1520-5827

文摘

This paper presents a facile hydrothermal route to synthesize monodispersive and single-crystalline BaHfO₃ hollow micro- and nanospheres in a concentrated basic environment. The hollow spheres were size tunable from submicrometer to nanoscale by simply adjusting the base concentration at a suitable temperature. The base concentration played the key role on forming BaHfO₃ hollow spheres. Detailed investigations on base concentration, reaction temperature, and duration indicated that the formation of BaHfO₃ hollow spheres was driven by Ostwald ripening process. Because of the abundance of defects, the as-prepared BaHfO₃ hollow nanospheres exhibited a blue light emission under UV-light excitation at room temperature. Calcination led to the photoluminescence declination due to the decrease of defects.