Titre :

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

Auteur(s) :

Barghouti, Mohamed El [Auteur correspondant]
جامعة مولاي إسماعيل = Université Moulay Ismaïl [UMI]
Akjouj, Abdellatif [Auteur]
Physique - IEMN [PHYSIQUE - IEMN]
Institut d’Électronique, de Microélectronique et de Nanotechnologie - UMR 8520 [IEMN]
Mir, Abdellah [Auteur]
جامعة مولاي إسماعيل = Université Moulay Ismaïl [UMI]

Titre de la revue :

Vacuum

Pagination :

109497, 11 pages

Éditeur :

Elsevier

Date de publication :

2020-10

ISSN :

0042-207X

Mot(s)-clé(s) en anglais :

Localized surface plasmon resonance
Silver nanoparticles
Graphene
Biosensor
Sensitivity

Discipline(s) HAL :

Sciences de l'ingénieur [physics]

Résumé en anglais : [en]

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 ...
Lire la suite >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.Lire moins >

Langue :

Anglais

Comité de lecture :

Oui

Audience :

Internationale

Vulgarisation :

Non

Collections :

• Institut d'Électronique, de Microélectronique et de Nanotechnologie (IEMN) - UMR 8520

Source :

Harvested from HAL