Transformation from Silver Nanoprisms to Nanodecahedra in a Temperature-Controlled Photomediated Synthesis

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• 作者：Haitao Wang ; Xianliang Zheng ; Jianli Chen ; Dechao Wang ; Qiyu Wang ; Tianyu Xue ; Chang Liu ; Zhao Jin ; Xiaoqiang Cui ; Weitao Zheng
• 刊名：The Journal of Physical Chemistry C
• 出版年：2012
• 出版时间：November 15, 2012
• 年：2012
• 卷：116
• 期：45
• 页码：24268-24273
• 全文大小：379K
• 年卷期：v.116,no.45(November 15, 2012)
• ISSN：1932-7455

文摘

The photomediated transformation of silver nanoparticles is both synthetically useful and mechanistically intriguing. Temperature effects on photochemical synthesis of silver nanoparticles are investigated. The morphology of final products is strongly dependent on the reaction temperature: nanodecahedra are formed at a low temperature of 20 掳C; nanoprisms are formed at a higher temperature of 40 掳C; and a mixture of shapes results at 30 掳C. An interesting transformation process is observed at a lower temperature of 20 掳C: silver nanoprisms are grown first and then transformed into nanodecahedra completely. We propose that silver seeds in a type of multitwinning are more stable than the platelike structure at lower temperature during the photochemical growth process. The transformed silver nanodecahedra exhibit greatly superior enhancement of Raman scattering compared to silver nanoprisms. These findings may provide a new insight on photomediated synthesis of silver nanostructures and suggest a new way of thinking about control over the morphology of nanoparticles.