Effect of graphene layer on the localized surface plasmon resonance (LSPR) and the sensitivity in periodic nanostructure

Abstract

We study the interaction of gold nanoparticles with a graphene film. Graphene is used as a spacer, as thin as possible, between the gold nanoparticles and the detection dielectric medium, and one of the advantages of graphene is to protect the structure, which allows to avoid the oxidation of nanoparticles. We focus our study on the variation of the resonant structure (LSPR) depending on the thickness of the graphene layer (0.34-5 nm). A stronger resonance behavior of positions in the absorption spectrum shows a strong coupling between the LSP on gold nanoparticles and the covering film. Numerical simulations indicate a significant shift of the resonance wavelength structure SiO x /AuNPs/Graphene/SiO x (657.90 nm) compared with experimental results obtained on SiO x /AuNPs/SiO x (574.71 nm) and optimized for the required parameters proposed LSPR system we achieve the highest detection sensitivity range, while the location of points of the electric field on the best corners of the gold-graphene nanoparticles.

MoS2–graphene hybrid nanostructures enhanced localized surface plasmon resonance biosensors

“…One can observe from Fig. 7(d) that the sensitivity increases with the number of graphene layers but for the layers 6, 7 and 8 of the graphene the sensitivity remains constant [14,17,54,55] (see Table 6).…”

“…However, in order to improve the sensitivity, there are several approaches for improving the adsorption of biomolecules, e.g. the growth of an affinity layer [14,15], using two-dimensional (2D) nano-layers of MoS 2 and graphene on AuNPs [16][17][18][19].…”

Reticular plasmon resonance detection properties of metal nanoparticles

“…3 presents a comparison of the field properties simulations in two cases of normal and oblique incidence. The structure is expected to change the sensitivity of the refractive index from the lower to the outside, since the confined field around nanoparticle [5,54].…”

“…From an optical point of view, the high refractive index of graphene should induce a redshift of plasmonic resonance when placed above AuNPs [5]. However, an unexpected blue shift in localized plasmon resonance of AuNPs was measured [22,23].…”

“…It has been known for many years that diffraction can be used for the excitation of surface plasmon polaritons, where as diffraction in regular networks of metal nanoparticles offers the potential to manipulate the properties of localized surface plasmons [1][2][3][4][5]. Surface plasmons (SP) refer to planar waves that propagate along the metal surface which are generated by the interaction between the magnetic transverse polarity (TM) light and the free electrons in the metal surface.…”