MoS₂-graphene hybrid nanostructures enhanced localized surface plasmon resonance biosensors

Mohamed El Barghouti , Abdellatif Akjouj (1, 2) , Abdellah Mir

1 IEMN - Institut d’Électronique, de Microélectronique et de Nanotechnologie - UMR 8520
2 PHYSIQUE - IEMN - Physique - IEMN

We propose a new configuration of a localized surface plasmon resonance (LSPR) biosensor that is based on MoS₂-graphene hybrid structures for ultrasensitive detection of molecules. The performance parameters of the proposed biosensor are defined in terms of absorption and sensitivity. Our study show that sensitivity can be greatly increased either by adding a bilayer MoS₂/graphene on the Au nanoparticles or by adding the MoS₂ layer or the graphene layer on the surface of the Au nanoparticles. The absorption curves for the proposed LSPR biosensor are analyzed and compared with the conventional biosensors without MoS₂/graphene. By optimizing the structure of the sensor, we find that the sensitivity as high as 360 nm/RIU can be achieved with 8-layers of MoS₂ and 10-layers of graphene. In addition, we show that the sensitivity can be controlled by changing the number of the monolayer of MoS₂ and/or graphene. Finally, we show that this sensor can detect successfully impure water after absorption of target single-stranded DeoxyriboNucleic Acid (ssDNA) biomolecules.

Domaines: Sciences de l'ingénieur [physics]

Mohamed El Barghouti, Abdellatif Akjouj, Abdellah Mir. MoS₂-graphene hybrid nanostructures enhanced localized surface plasmon resonance biosensors. Optics and Laser Technology, 2020, 130, pp.106306. ⟨10.1016/j.optlastec.2020.106306⟩. ⟨hal-03141656⟩