摘要
种子法制备金纳米棒,粒子的长径比经历了先增大后减小的过程,这一过程不利于纳米棒形貌的控制。本文中,在优化生长液配比的前提下,通过改变种子用量有效地调节粒子的大小和长径比。动态监测发现,在粒子长径比的转折点处粒子的尺度并不受种子用量的影响。粒子的各向异性生长可以通过不同晶面的原子沉积速度来描述,模拟结果显示纳米粒子的成长遵循固定的生长轨迹,当原料耗尽时粒子生长结束,所有结束点均位于其生长轨迹上。这一结果为精确调控金纳米棒的形貌提供实验和理论参考。
The gold nanorods in solution grow along an intrinsic trajectory, which describes the correlation of length and diameter, and also defines the AR evolution, and has low dependence on the seed and precursor concentrations. The final shape and size of gold nanorods can be ascribed to the termination of the growth on this trajectory, which is determinate by the average number of gold precursors available for individual growing nanorod.
引文
[1]Wang,Y.;Long,S.;Vdovi?,S.;Wang,X.F.Chem.Mater.2013,25:1372.
[2]Henkel,A.;Olaf Schubert;Plech,A.;Sonnichsen,C.J.Phys.Chem.C 2009,113:10390.