Mechanistic study of photomediated triangular silver nanoprism growth
Mechanistic study of photomediated triangular silver nanoprism growth
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DOI：
10.1021/ja8005258
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发表时间：
2008-07-02
影响因子：
15
通讯作者：
Mirkin, Chad A.
中科院分区：
文献类型：
--
作者：
Xue, Can;Metraux, Gabriella S.;Mirkin, Chad A.
本文介绍了银纳米棱镜的光介导生长的机理研究。数据表明，光化学过程是由银氧化还原循环驱动的，包括银颗粒表面上的柠檬酸盐还原银阳离子和O-2氧化溶解小银颗粒。双（对-磺酸基苯基）苯基膦通过络合Ag+增加其溶解度，并作为缓冲剂将Ag+的浓度保持在20 μ M。银颗粒作为光催化剂，并在等离子体激发下，促进Ag+还原柠檬酸盐。较高的Ag+浓度有利于竞争性的热处理，这导致棱镜厚度增加。
This article presents a mechanistic study of the photomediated growth of silver nanoprisms. The data show that the photochemical process is driven by silver redox cycles involving reduction of silver cations by citrate on the silver particle surface and oxidative dissolution of small silver particles by O-2.Bis(p-sulfonatophenyl)phenylphosphine increases the solubility of the Ag+ by complexing it and acts as a buffer to keep the concentration of Ag+ at 20 mu M. The silver particles serve as pholocatalysts and, under plasmon excitation, facilitate Ag+ reduction by citrate. Higher Ag+ concentrations favor a competitive thermal process, which results in increased prism thickness.