title: Dynamic and quantitative control of the DNA-mediated growth of gold plasmonic nanostructures.
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.
authors: Shanghai Synchrotron Radiation Facility, Division of Physical Biology, CAS Key Laboratory of Interfacial Physics and Technology, Shanghai Institute of Applied Physics, Chinese Academy of Sciences, Shanghai 201204 (China).
authors: Jianlei
authors: J
authors: Shen
authors: Lifeng
authors: L
authors: Xu
authors: Chunpeng
authors: C
authors: Wang
authors: Hao
authors: H
authors: Pei
authors: Renzhong
authors: R
authors: Tai
authors: Shiping
authors: S
authors: Song
authors: Qing
authors: Q
authors: Huang
authors: Chunhai
authors: C
authors: Fan
authors: Gang
authors: G
authors: Chen
mesh_terms: D006046:Gold / Q000737:chemistry*; D053768:Metal Nanoparticles / Q000737:chemistry*; D008854:Microscopy, Electron; D049329:Nanostructures / Q000737:chemistry*; D013059:Spectrum Analysis, Raman / Q000379:methods*; D020349:Surface Plasmon Resonance; D014961:X-Ray Diffraction
chemical_list: D006046:Gold
keywords: DNA; electron microscopy; gold nanoparticles; small-angle X-ray scattering; surface-enhanced Raman scattering