Design of silver nanoparticles with graphene coatings layers used for LSPR biosensor applications - Archive ouverte HAL Accéder directement au contenu
Article Dans Une Revue Vacuum Année : 2020

Design of silver nanoparticles with graphene coatings layers used for LSPR biosensor applications

Résumé

A new hybrid graphene nanoplasmonic structure, using silver nanoparticles (AgNPs) coated with a graphene film and deposited on a substrate is proposed in this paper. The aim is to obtain a plasmonic response with high sensitivity for plasmonic biosensors. We show, through the calculation of absorption spectra, that the localized surface plasmon resonance (LSPR) obtained in the SiOx/AgNPs/Graphene nanostructure is very sensitive to variations in the thickness of the graphene and those of the refractive index of the detection medium. The study reveals a shift in plasmon resonance peaks resulting from the coupling between the AgNPs networks and the covering graphene layer. We obtained the red-shift of LSPR modes from 412 nm to 548 nm when the thickness of the graphene layer increases from 0.34 nm to 9 nm. We have shown that the increase in graphene thickness significantly affects the sensitivity of the device under study. An optimal sensitivity value is obtained for a graphene thickness of 9 nm, with a 304.60% gain in sensitivity value compared to the structure without graphene. These properties should enhance these nano-device and make them a preferred choice for biosensors applications, over other current biosensors.
Fichier non déposé

Dates et versions

hal-03321517 , version 1 (17-08-2021)

Identifiants

Citer

Mohamed El Barghouti, Abdellatif Akjouj, Abdellah Mir. Design of silver nanoparticles with graphene coatings layers used for LSPR biosensor applications. Vacuum, 2020, 180, 109497, 11 p. ⟨10.1016/j.vacuum.2020.109497⟩. ⟨hal-03321517⟩
19 Consultations
0 Téléchargements

Altmetric

Partager

Gmail Facebook X LinkedIn More