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.

我们提出了一种基于MoS _{2 –}石墨烯杂化结构的局部表面等离振子共振（LSPR）生物传感器的新配置，用于分子的超灵敏检测。所提出的生物传感器的性能参数是根据吸收和灵敏度定义的。我们的研究表明，通过在Au纳米颗粒上添加双层MoS ₂ /石墨烯或在Au纳米颗粒表面上添加MoS ₂层或石墨烯层，可以大大提高灵敏度。分析了所建议的LSPR生物传感器的吸收曲线，并与没有MoS ₂的常规生物传感器进行了比较/石墨烯。通过优化传感器的结构，我们发现，使用8层MoS ₂和10层石墨烯可以实现高达360 nm / RIU的灵敏度。此外，我们表明可以通过更改MoS ₂和/或石墨烯单层的数量来控制灵敏度。最后，我们证明该传感器在吸收目标单链脱氧核糖核酸（ssDNA）生物分子后可以成功检测不纯净水。