Shape Evolution of Silver Nanoplates through Heating and Photoinduction

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• 作者：Bin Tang ; Shuping Xu ; Xueliang Hou ; Jingliang Li ; Lu Sun ; Weiqing Xu ; Xungai Wang
• 刊名：ACS Applied Materials & Interfaces
• 出版年：2013
• 出版时间：February 13, 2013
• 年：2013
• 卷：5
• 期：3
• 页码：646-653
• 全文大小：444K
• 年卷期：v.5,no.3(February 13, 2013)
• ISSN：1944-8252

文摘

Shape conversions of silver nanoplates were realized by heating and subsequent light irradiation. The initial silver nanoprisms were transformed into silver nanodisks gradually in the process of heating, which was possibly achieved through dissolving and readsorption of silver atoms on the surface of silver nanoplates. Subsequently, under light irradiation, the heating induced silver nanodisks were reversed to silver nanoprisms in the same solution. The dissolved oxygen was found to play a pivotal role in the shape conversion from nanoprism to nanodisk. In addition to heating, deionized water could induce the shape conversion of silver nanoplates when it was added to precipitate of the initial silver nanoprisms after centrifugation. Citrate in solution is essential to the photoinduced shape conversion process. Transmission electron microscopy (TEM) and extinction spectroscopy results demonstrated that localized surface plasmon resonance (LSPR) properties of silver nanoplates were effectively tuned through shape conversion.

Keywords:

silver nanoparticles; shape conversion; heating aging; light irradiation; nanodisks; nanoprisms; localized surface plasmon resonance