Correlation between Multiple Growth Stages and Photocatalysis of SrTiO3 Nanocrystals

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• 作者：Hongquan Zhan ; Zhi-Gang Chen ; Jianle Zhuang ; Xianfeng Yang ; Qili Wu ; Xiangping Jiang ; Chaolun Liang ; Mingmei Wu ; Jin Zou
• 刊名：Journal of Physical Chemistry C
• 出版年：2015
• 出版时间：February 19, 2015
• 年：2015
• 卷：119
• 期：7
• 页码：3530-3537
• 全文大小：552K
• ISSN：1932-7455

文摘

The relationship between growth kinetic and photocatalysis of SrTiO₃ nanoparticles is investigated by close correlation of their growth behaviors under the different stages. The detailed structural characterizations show that SrTiO₃ crystal growth does not follow the classic route. A new growth mechanism, including the first formation of SrTiO₃ mesoporous sphere followed by the single crystal growth via oriented attachment, size shrinking, and Ostwald ripening, is proposed. The photocatalytic ability of the as-grown SrTiO₃ products at different growth stages, checked by the degradation of methyl orange, shows different properties. The results indicate that the size, morphology, and defects of the resultant SrTiO₃ products, tailored during the different growth stages, were highly responsible for the photocatalytic activity. Especially, the semicrystalline SrTiO₃ mesoporous spheres produced by oriented attachment at the initial stage show the highest photocatalytic ability.