Plasmon Coupling in Two-Dimensional Arrays of Silver Nanoparticles: I. Effect of the Dielectric Medium

Abstract

The effect of the dielectric medium between the particles on plasmon coupling was studied experimentally and theoretically. Two-dimensional arrays of silver nanoparticles adsorbed on glass slides were immobilized using poly(methylmethacrylate). The method provides an efficient way for stabilization of particles on surfaces. It was concluded that increasing the dielectric function of the surrounding medium promotes plasmon coupling between silver nanoparticles. On the basis of the quasi-crystalline approximation, the optimum refractive index was calculated that yielded the strongest and highest Q extinction band due to coherent plasmon coupling.

Surface-Enhanced Raman Spectroscopy Hot-Spots on Ostwald Ripened Silver Nanoparticles Prepared by Galvanic Displacement

“…27,28 This leads to multipole coupling that may change the magnitude of the enhancement factor, as suggested by Stockman et al 27 In addition to the spatial organization of the silver particles, the importance of the environment in which they are located with has been acknowledged. 29 It has been calculated that silver particles that are coated with a dielectric layer and are touching may provide 10 14 enhancement on the symmetry axis and as much as 5 Â 10 13 , a distance of 1.5 nm away from the axis. 30 The Journal of Physical Chemistry C ARTICLE Interestingly silica beads coated with a layer of gold exhibit higher enhancement than gold particles alone, although they were not highly enhancing when aggregated.…”

Ag/α-Fe2O3 hollow microspheres: Preparation and application for hydrogen peroxide detection

“…What's more, a hollow structure has high specific surface area, which is advantageous for wide distribution of the metal particles. As a noble metal, silver nanoparticles have attracted considerable attention due to their antimicrobial, catalytic, optical, chemical, biological properties, and so on [16][17][18][19][20][21][22][23]. However, the poor dispersion of nanoparticles has been a bottleneck for nanocomposite fabrication [24][25][26].…”

Characterization and Synthesis of Silica-Coated Silver Nanoparticles by Sol-Gel Method with Controlling of Adding Ammonical Silver Nitrate Amount

“…And then among these novel materials, the various types of core-shell nanostructures exhibited unique properties of electronics, catalysis, magnetism and optics owing to their composite structure and design [1][2][3][4][5][6]. Furthermore silica cores with silver (Ag) nanoparticle shells are the most widely studied due to the potential applications of Ag nanoparticles in many fields, such as deoxyribonucleic acid (DNA) sensors, surface-enhanced Raman scattering (SERS) detection, surface plasmon resonance (SPR) sensors and fluorescence signals [7][8][9][10].…”