Theoretical insights of dual SERS enhancement of graphene gold nanocomposites for biosensing application

Vennila Preethi S.; Gowri Annasamy

doi:10.1117/12.2669492

11 May 2023 Theoretical insights of dual SERS enhancement of graphene gold nanocomposites for biosensing application

Vennila Preethi S., Gowri Annasamy

Proceedings Volume 12638, Women in Optics and Photonics in India 2022; 1263803 (2023) https://doi.org/10.1117/12.2669492
Event: Women in Optics and Photonics in India, 2022, Bangalore, India

Abstract

Hybrid nanocomposites are gaining significance as they offer dual enhancement of both chemical and electromagnetic enhancements. In this context, Graphene gold nanocomposites are of the suitable choice, offering dual SERS enhancement. However, the fabrication of SERS substrates involving hybrid nanomaterials is challenging due to the higher fabrication cost and repeated generation of hotspot sites. Hence, in this study, theoretical investigation on the influential parameters producing dual SERS enhancement by graphene gold nanocomposites is studied using the 2D Finite Element method analysis in COMSOL Multiphysics software. Herein, electromagnetic waves are utilized to excite the surface plasmons created at the graphene gold interface and the scattered light intensity is measured to quantify the dual SERS enhancement. The parameters influencing the enhancement including diameter and inter particle distance of the gold nanoparticles, interactions at graphene gold interface, graphene layer coating onto various substrates and thickness of the graphene layer are investigated. The scattered light intensity around the nanoparticle surface is increased in the presence of graphene layer and the effective refractive index sensitivity was optimized by choosing various substrate materials. Further, the interparticle spacing and the graphene layer coating are optimized and found ~5 nm interparticle spacing with minimum graphene layer coating of 5 nm achieved improved electric field strength around the nanocomposite surface. RI sensitivity for PMMA substrate is higher and can be used for biosensing applications. The theoretical results obtained could be of high value for the fabrication of graphene gold nanocomposite SERS substrates for achieving better sensitivity.

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Vennila Preethi S. and Gowri Annasamy "Theoretical insights of dual SERS enhancement of graphene gold nanocomposites for biosensing application", Proc. SPIE 12638, Women in Optics and Photonics in India 2022, 1263803 (11 May 2023); https://doi.org/10.1117/12.2669492

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KEYWORDS

Graphene

Nanocomposites

Gold

Gold nanoparticles

Biosensing

Electric fields

Surface enhanced Raman spectroscopy

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