3D Self‐Assembled Plasmonic Superstructures of Gold Nanospheres: Synthesis and Characterization at the Single‐Particle Level

Abstract

The synthesis of 3D self-assembled plasmonic superstructures of gold nanospheres as well as the characterization of their structural and optical properties at the single-particle level is presented. This experimental work is complemented by FEM (finite element method) simulations of elastic scattering spectra and the spatial |E|(4) distribution for establishing structure-activity correlations in these complex 3D nanoclusters.

Surface-enhanced Raman spectroscopy at single-molecule scale and its implications in biology

“…This will be discussed in detail in §4. Nanoassemblies with multiple hot spots have also been fabricated according to colloidal chemistry reported by Schlü cker's group [73]. The electromagnetic field and the EF around the nanoassemblies were simulated and calculated by the finite-element method, which indicated that the EF value on the nanoassemblies can be as high as 10 10 , demonstrating its potential to be used as a SERS substrate for SM sensing.…”

Three-dimensional SERS hot spots for chemical sensing: Towards developing a practical analyzer

“…In order to overcome this limitation, an alternative approach to reliably engineer 3D SERS substrates 7 approaches, is an emerging and promising field for high-yield production of 3D NP clusters with small interparticle gaps. [28] Many methods have been reported to produce 3D organized plasmonic clusters with high coordination number by the use of nucleic acids or other organic molecules as linking elements. Au NPs with identical sizes but different shapes have been used as building blocks to prepare 3D superstructures.…”

The surface plasmon modes of self-assembled gold nanocrystals

“…25 Hence, only electrostatically assembled 3D core-satellite superstructures have been fully characterized on a substrate, although these structures are highly asymmetric due to the random distribution of the satellite particles on the core. 26 We report here the first synthesis and optical studies of the plasmon modes of highly ordered 3D gold tetrahedra, pentamers and hexamers. The assembled structures are found to be stable on substrates in stark contrast to earlier clusters and can be visualized using scanning electron microscopy (SEM) and atomic force microscopy (AFM).…”