Silver Nanodisks with Tunable Size by Heat Aging
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- 作者：Bin Tang ; Jing An ; Xianliang Zheng ; Shuping Xu ; Dongmei Li ; Ji Zhou ; Bing Zhao ; Weiqing Xu
- 刊名：Journal of Physical Chemistry C
- 出版年：2008
- 出版时间：November 27, 2008
- 年：2008
- 卷：112
- 期：47
- 页码：18361-18367
- 全文大小：494K
- 年卷期：v.112,no.47(November 27, 2008)
- ISSN：1932-7455
文摘
A large quantity of well-defined silver nanodisks was prepared by heating silver nanoprisms in aqueous solution. By adjusting only the heating time, the conversion of the morphology and the size of the nanoplates could be easily and effectively controlled. The local surface plasmon resonance (LSPR) of the silver nanoplates could be tuned in a certain range in the heat-aging process. A gradual blue shift in their LSPR bands with the aging time was observed from 655 to 472 nm. The transformation of the morphology during heat aging was captured by the transmission electron microscopy (TEM). The TEM images indicate that the silver atoms on the corners and sides of the nanoprisms dissociate and rearrange during the period of shape transformation. The dissociation of the silver atoms at the sides of the nanoplates is overwhelming when the size shrinks, which is due to the difference in the surface energy and the limiting of citrate stabilization. In addition to the heating effect, we found that the concentration of citrate is another crucial factor for rebuilding the silver nanoplates.