Morphological evolution of single-crystal Ag nanospheres during the galvanic replacement reaction with HAuCl4
Morphological evolution of single-crystal Ag nanospheres during the galvanic replacement reaction with HAuCl4
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DOI：
10.1021/jp711662f
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发表时间：
2008-05-29
影响因子：
3.7
通讯作者：
Xia, Younan
中科院分区：
文献类型：
--
作者：
Kim, Mun Ho;Lu, Xianmao;Xia, Younan
本文系统地研究了水介质中23.5 nm单晶Ag纳米球与HAuCl4的电偶置换反应。我们监测了随着HAuCl4与Ag摩尔比的增加而发生的形态和光谱的变化。在单晶银纳米球上发生置换反应，形成了一系列由Au-Ag合金组成的中空、多孔纳米结构。通过改变HAuCl4与Ag的摩尔比，我们能够控制孔的大小和密度。此外，随着产物变得越来越中空和多孔，这些纳米结构的局域表面等离子体共振峰可以很容易地从408 nm调谐到791 nm。
This paper presents a systematic study of the galvanic replacement reaction between 23.5 nm single-crystal Ag nanospheres and HAuCl4 in an aqueous medium. We have monitored both morphological and spectral changes as the molar ratio of HAuCl4 to Ag is increased. The replacement reaction on single-crystal Ag nanospheres results in the formation of a series of hollow and porous nanostructures composed of Au-Ag alloys. By varying the molar ratio of HAuCl4 to Ag, we are able to control the size and density of the pores. In addition, the localized surface plasmon resonance peaks of these nanostructures can be readily tuned from 408 to 791 nm as the product becomes increasingly more hollow and porous.