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首页> 外文期刊>The journal of physical chemistry, B. Condensed matter, materials, surfaces, interfaces & biophysical >Gold nanorods to nanochains: Mechanistic investigations on their longitudinal assembly using alpha,omega-alkanedithiols and interplasmon coupling
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Gold nanorods to nanochains: Mechanistic investigations on their longitudinal assembly using alpha,omega-alkanedithiols and interplasmon coupling

机译：金纳米棒到纳米链：使用α，ω-链烷二硫醇和质子间偶合进行纵向组装的机理研究

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摘要

Mechanistic investigations on the end-to-end assembly of An nanorods to nanochains, in the presence of alpha,w-alkanedithiols, were reported. A decrease in the longitudinal plasmon absorption was observed along with a concomitant formation of a new red-shifted band above a critical concentration of dithiol, which is attributed to the interplasmon coupling in assembled nanorods. However, no noticeable spectral changes were observed below the critical concentration, and the TEM studies indicate that the nanorods remain isolated and randomly distributed. This step is ascribed as an incubation step wherein one of the thiol groups of alpha,w-alkanedithiol preferentially binds onto the edges of the nanorods, leaving the other thiol group free. Above the critical concentration, a chain up process proceeds through the interlocking of nanorods, initially to dimers and subsequently to oligomers, which results in longitudinal interplasmon coupling. The dimerization step follows second-order kinetics which deviates with time due to oligomerization. The rate constants for dimerization of nanorods possessing various dithiols and their energy of activation were determined. The large activation energy for the dimerization further confirms that the process is not diffusion but activation controlled.
机译：报道了在α，w-链烷二硫醇存在下，纳米棒到纳米链的端到端组装的机理研究。观察到纵向等离激元吸收的减少以及伴随二硫醇的临界浓度以上的新的红移带的形成，这归因于组装的纳米棒中的等离激元耦合。然而，在临界浓度以下没有观察到明显的光谱变化，并且TEM研究表明纳米棒保持隔离并且随机分布。该步骤被称为孵育步骤，其中α，w-烷二硫醇的硫醇基团之一优先结合到纳米棒的边缘上，而另一个硫醇基团游离。高于临界浓度，通过纳米棒的互锁进行链结过程，首先是二聚体，然后是低聚物，这导致纵向等离激元偶联。二聚化步骤遵循由于低聚作用而随时间变化的二阶动力学。确定具有各种二硫醇的纳米棒的二聚化速率常数及其活化能。用于二聚化的大活化能进一步证实该过程不是扩散而是活化受控的。

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