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31 Jul 02:35

Dynamic and Quantitative Control of the DNA-Mediated Growth of Gold Plasmonic Nanostructures

by Jianlei Shen, Lifeng Xu, Chunpeng Wang, Hao Pei, Renzhong Tai, Shiping Song, Qing Huang, Chunhai Fan, Gang Chen

Abstract

Reproducible and controllable growth of nanostructures with well-defined physical and chemical properties is a longstanding problem in nanoscience. A key step to address this issue is to understand their underlying growth mechanism, which is often entangled in the complexity of growth environments and obscured by rapid reaction speeds. Herein, we demonstrate that the evolution of size, surface morphology, and the optical properties of gold plasmonic nanostructures could be quantitatively intercepted by dynamic and stoichiometric control of the DNA-mediated growth. By combining synchrotron-based small-angle X-ray scattering (SAXS) with transmission electron microscopy (TEM), we reliably obtained quantitative structural parameters for these fine nanostructures that correlate well with their optical properties as identified by UV/Vis absorption and dark-field scattering spectroscopy. Through this comprehensive study, we report a growth mechanism for gold plasmonic nanostructures, and the first semiquantitative revelation of the remarkable interplay between their morphology and unique plasmonic properties.

Thumbnail image of graphical abstract

A heart of gold: A quantitative approach to intercept the evolution of size, surface morphology, and the optical properties of Au plasmonic nanostructures is demonstrated by dynamic control of the DNA-mediated growth. The structural parameters of these nanostructures correlate well with their optical properties, obtained from small-angle X-ray scattering (SAXS) and transmission electron microscopy (TEM).