Controllable synthesis of gold nanoparticle dimers via site-selective growth

Abstract

Random aggregation of nanoparticles follows the step-growth kinetics, thus the synthesis of nanoparticle dimers with large size is still a challenge. Here, we report a site-selective growth route to produce...

Study of Field Enhancement in the Subnanometer Gap of Plasmonic Dimers Accounting for the Surface Quantum Effect

“…1. Evaluation of the number M which equals the amount of Fourier harmonics in the plane wave representation (9), assuming that the relative error in the plane wave approximation is less than 0.05%.…”

“…An example of the application of such a plasmonic structure can be paired particles (dimers) made of noble metals [7,8], which are arranged in such a way that the gap between them is minimal. It should be noted that advanced synthesis technologies enable the obtainment of a subnanometer gap of the order of 1 nm [9,10]. Structures with nanogaps are used, for example, to decipher the spectra of individual molecules and develop biosensors of various types [11][12][13][14].…”

Plasmonic Cyclic Au Nanosphere Hexamers

“…[ 1–4 ] Another way to control the surface plasmonic characteristics is via the spatial assembly of such building blocks in a rational way, yielding unique arrangement‐dependent optical properties that are different from those of single‐particle counterparts. For example, plasmonic chains [ 5 ] or oligomer‐type assemblies [ 6–8 ] made by spatial placement of Au NSs have been explored in diverse plasmonic applications, ranging from sensing, [ 9 ] bioimaging, [ 10 ] and surface‐enhanced Raman scattering (SERS) [ 11–14 ] to non‐linear optics, such as plasmonic hybridization, [ 15,16 ] and Fano resonance. [ 17 ] To realize such structures, conventional top‐down lithographical approaches using e‐beam lithography with high fidelity as well as high‐precision has been frequently adopted, but this approach often requires delicate hands‐on skills and expensive instruments.…”

Multifaceted ligand design facilitates chemical- or peptide-mediated linking of hollow gold nanoshells with tuned interparticle distance, interference and cytotoxicities

“…Attempts that have mainly focused on metal nanoparticle dimer synthesis in general, have included using deoxyribose nucleic acid (DNA) base pairing, electrostatic interactions, hydrogen bonding, coordination chemistry, and through covalent bonds. [53][54][55][56] Despite this elegant work, significant challenges still remain in developing chemical routes that could streamline linking metal nanoparticles 57 and hollow gold nanoshells in particular, and provide a platform to evaluate their properties.…”