Chandran S Prathap, Pasricha Renu, Bhatta Umananda M, Satyam P V, Sastry Murali
Nanoscience Group, Materials Chemistry Division, National Chemical Laboratory, Pune 411008, India.
J Nanosci Nanotechnol. 2007 Aug;7(8):2808-17. doi: 10.1166/jnn.2007.636.
A seed mediated approach for the synthesis of anisotropic rod shaped gold nanoparticles in organic media (toluene) is demonstrated. Pre-formed gold nanoparticles stabilized in toluene by 4-hexadecylaniline (HDA) are used as seeds. These when reacted with 1-octadecylamine (ODA) hydrophobised chloroaurate ions in toluene lead to the formation of gold nanorods. ODA or alkylamines of different chain lengths which are the chloroaurate ion phase transfer agent have been found to play a key role in the formation of the nanorods. The gold nanorods that have a five-fold symmetry evolve from multiply twinned particles and are bound at the tips by [1 11] faces and at the sides by [100] faces. The gold nanorods have been shown to grow under the shape directing effect of the alkylamines which stabilize the high energy [100] faces. The concentration of the alkylamines has been found to play a critical role in the formation of the gold nanorods. Higher concentrations of the alkylamines lead to formation of spherical particles, at times of narrow size distribution.
本文展示了一种在有机介质（甲苯）中通过种子介导合成各向异性棒状金纳米粒子的方法。预先制备的由4-十六烷基苯胺（HDA）稳定在甲苯中的金纳米粒子用作种子。当这些种子与在甲苯中疏水化的氯金酸根离子和1-十八胺（ODA）反应时，会导致金纳米棒的形成。已发现作为氯金酸根离子相转移剂的ODA或不同链长的烷基胺在纳米棒的形成中起关键作用。具有五重对称性的金纳米棒由多重孪晶颗粒演化而来，其尖端由[1 11]面结合，侧面由[100]面结合。已表明金纳米棒在烷基胺的形状导向作用下生长，烷基胺可稳定高能的[100]面。已发现烷基胺的浓度在金纳米棒的形成中起关键作用。较高浓度的烷基胺有时会导致形成尺寸分布窄的球形颗粒。
