Abstract 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.

中文翻译：

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用于 LSPR 生物传感器应用的具有石墨烯涂层的银纳米粒子的设计

摘要 本文提出了一种新的混合石墨烯纳米等离子体结构，该结构使用涂有石墨烯薄膜并沉积在基板上的银纳米粒子 (AgNPs)。目的是为等离子体生物传感器获得具有高灵敏度的等离子体响应。我们通过吸收光谱的计算表明，在 SiOx/AgNPs/石墨烯纳米结构中获得的局域表面等离子体共振 (LSPR) 对石墨烯厚度和检测介质折射率的变化非常敏感。该研究揭示了由 AgNPs 网络和覆盖的石墨烯层之间的耦合引起的等离子体共振峰的偏移。当石墨烯层的厚度从 0.34 nm 增加到 9 nm 时，我们获得了 LSPR 模式从 412 nm 到 548 nm 的红移。我们已经表明，石墨烯厚度的增加会显着影响所研究设备的灵敏度。石墨烯厚度为 9 nm 时获得了最佳灵敏度值，与没有石墨烯的结构相比，灵敏度值提高了 304.60%。这些特性应该增强这些纳米器件，并使它们成为生物传感器应用的首选，而不是其他当前的生物传感器。