Preparation of Narrow Dispersity Gold Nanorods by Asymmetrical Flow Field-Flow Fractionation and Investigation of Surface Plasmon Resonance

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• 作者：J. Ray Runyon ; Adam Goering ; Ken-Tye Yong ; S. Kim Ratanathanawongs Williams
• 刊名：Analytical Chemistry
• 出版年：2013
• 出版时间：January 15, 2013
• 年：2013
• 卷：85
• 期：2
• 页码：940-948
• 全文大小：472K
• 年卷期：v.85,no.2(January 15, 2013)
• ISSN：1520-6882

文摘

The development of an asymmetrical field-flow fractionation (AsFlFFF) method for separating gold nanorods (GNR) is reported. Collected fractions containing GNR subpopulations with aspect ratios, sizes, and shapes which are more narrowly dispersed than the original population were further characterized by UV鈥搗is spectroscopy and transmission electron microscopy. This ability to obtain different sizes and shapes of nanoparticles enabled the evaluation of a new approach to estimating the retention time and hydrodynamic size of nanorods and the investigation of GNR optical properties at a previously unattainable level of detail. Experimental results demonstrate that the longitudinal surface plasmon absorption maximum of GNRs is correlated with the effective particle radius in addition to the aspect ratio. This may account for some of the variabilities reported in published empirical data from different research groups and supports reports of simulated absorption spectra of GNRs of different physical dimensions. The use of AsFlFFF with dual UV鈥搗is detection to rapidly assess relative changes in GNR subpopulations was demonstrated for irregularly shaped gold nanoparticles formed at different synthesis temperatures.