IRAMIS-SIS2M-LIONS, CEA Saclay, 9191 Gif-sur-Yvette, France.
Langmuir. 2010 May 18;26(10):6887-91. doi: 10.1021/la100843k.
A quantitative analysis of object populations obtained by TEM images is performed for the classical scheme of aqueous seedless synthesis of nanorods. Using an effective way to represent nanoparticle size distributions, we unravel that spheres, usually considered to be a side-product, are in fact coming from a competing route during nanorod formation. The differentiation between spheres and rods appears above a critical size of 5 nm and is due to different growth rates between faces. The initial repartition of faces on nuclei or on the nanoparticles at the critical size can be the source for the final differentiation between globules and rods. The efficiency of the selection is strongly influenced by the production of the initial seeds and, in particular, by the amount of borohydride added in the present scheme.
采用 TEM 图像对经典的水溶液无种子法合成纳米棒的对象种群进行定量分析。通过一种有效表示纳米颗粒尺寸分布的方法，我们揭示了通常被认为是副产物的球体实际上是在纳米棒形成过程中的竞争途径中产生的。在 5nm 以上的临界尺寸下，球体和棒体之间出现了差异，这是由于不同晶面之间的生长速率不同所致。在临界尺寸下，核或纳米颗粒上的初始晶面分布可能是最终区分球体和棒体的原因。这种选择的效率受到初始种子生成的强烈影响，特别是在本方案中添加的硼氢化钠的量的影响。
