Control of the shape and the size of copper metallic particles
Control of the shape and the size of copper metallic particles
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DOI：
10.1021/jp9523837
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发表时间：
1996-03-07
影响因子：
--
通讯作者：
Pileni, MP
中科院分区：
文献类型：
--
作者：
Lisiecki, I;Billoudet, F;Pileni, MP
在水溶液中，用硼氢化钠还原十二烷基硫酸铜，得到胶体铜粉。在临界胶束浓度(CMC)以下，得到了孤立的颗粒，形成了由氧化物或纯金属铜聚集体组成的相互连接的网络。在CMC以上进行的合成表明，形成了细长的或球形的铜金属颗粒。微晶的大小和形状受表面活性剂浓度的控制。用透射电子显微镜和紫外可见光谱分析了金属铜颗粒从球状到棒状的形状变化。计算表明，随着粒子伸长率的增加，等离子体激元峰值发生红移。结果表明，胶束聚集体的形成和数量控制着胶束粒子的形状和大小。
Colloidal copper particles were prepared in aqueous solution via the reduction of copper dodecyl sulfate, Cu(DS)(2), by sodium borohydrate. Below the critical micellar concentration (cmc), it has been obtained isolated particles forming an interconnected network of either oxide or pure metallic copper aggregates. Syntheses performed above the cmc show the formation of elongated or spherical copper metallic particles. The size and shape of crystallites are controlled by surfactant concentration. The change in the shape of metallic copper particles from spheres to rods is followed by TEM and UV-visible spectroscopy. As it has been predicted by calculation, a red shift in the plasmon peak is observed when the elongation of the particles increases. It is demonstrated that the shape and the size of the particles are controlled by the formation and the number of micellar aggregates.