Highly sensitive plasmonic biosensor based on ring shape nanoparticles for the detection of ethanol and D-glucose concentration

Abstract

Today bioelectronics needs more sensitive sensors in their development. The main aim of this work is to design a highly sensitive optical sensor for the quantitative detection of ethanol and D-glucose through particular localized surface plasmon resonances (LSPRs) depending on shape and type of ring shape core@shell nanoparticles. The simulated plasmoniccore@shell nanoparticles consist of Ag or Au shell and air, Ag, or Au cores. The obtained results show the plasmonic resonance wavelength of the air@Ag nanoparticles strongly depends on their inner radiuses and using an air-core improves their resolution. Also, it is investigated that ring shape air@Agcore@shell nanoparticles are more sensitive to surrounding medium refractive index variation. It is showed that ~1.26 nm to ~6.27 nm and ~0.9 nm to ~2.6 nm in scattering plasmonic peak shifts are obtained corresponding to 1 g/dl to 10 g/dl D-glucose and 1 ml/dl to 10 ml/dl ethanol concentration changes. The sensitivity of the air@Ag nanostructure is 890.84 nm/RIU for D-glucose concentration changes from 0 to 1 g/dl. This higher sensitivity with the full width at half-maximum of 61.3 nm yields the figure of merit of 14.53. The findings of this work provide a novel perspective in the field of the optical sensors and can be applied to detect any other components.