Controlled Synthesis of -AgI Nanoplatelets from Selective Nucleation of Twinned Ag Seeds in a Tandem Reaction
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- 作者：Choon Hwee Bernard Ng ; Wai Yip Fan
- 刊名：Journal of Physical Chemistry C
- 出版年：2007
- 出版时间：February 22, 2007
- 年：2007
- 卷：111
- 期：7
- 页码：2953 - 2958
- 全文大小：936K
- 年卷期：v.111,no.7(February 22, 2007)
- ISSN：1932-7455
文摘
Recent research has established the influence of seed nature in determining the final shapes of metallic (Ag,Au) nanocrystals. In this work, we utilize and extend this knowledge to produce anisotropic 
hars/beta2.gif" BORDER=0 ALIGN="middle">-AgI nanoplateletsin high yield: Ag seeds (~20 nm) with twin defects were first selectively nucleated and then reacted with I-in a one-pot tandem reaction. I- performs multiple roles of oxidative dissolution regulator and reactant andsurface stabilizing agent, thereby reducing the complexity of the synthesis. Examination of the nanocrystalsat different stages of the reaction via electron microscopy confirmed that the AgI nanoplates grew fromtwinned Ag seeds and the initial Ag seed formation step was found to be vital to the appearance of theanisotropic platelike AgI nanocrystals. In general, the reaction of preformed metallic seeds with other reactivespecies may provide a convenient channel for the shape-controlled production of semiconductor nanostructures,with the final shapes being determined by the structure (twinning) of the seed. Aging of the reaction mixturein the presence of light resulted in the dissolution of AgI nanoplates to form Ag dendritic nanostructures. Weexplained its growth based on a diffusion-limited aggregation model.
hars/beta2.gif" BORDER=0 ALIGN="middle">-AgI nanoplateletsin high yield: Ag seeds (~20 nm) with twin defects were first selectively nucleated and then reacted with I-in a one-pot tandem reaction. I- performs multiple roles of oxidative dissolution regulator and reactant andsurface stabilizing agent, thereby reducing the complexity of the synthesis. Examination of the nanocrystalsat different stages of the reaction via electron microscopy confirmed that the AgI nanoplates grew fromtwinned Ag seeds and the initial Ag seed formation step was found to be vital to the appearance of theanisotropic platelike AgI nanocrystals. In general, the reaction of preformed metallic seeds with other reactivespecies may provide a convenient channel for the shape-controlled production of semiconductor nanostructures,with the final shapes being determined by the structure (twinning) of the seed. Aging of the reaction mixturein the presence of light resulted in the dissolution of AgI nanoplates to form Ag dendritic nanostructures. Weexplained its growth based on a diffusion-limited aggregation model.