Abstract
In this article, numerically a surface plasmon resonance (SPR) biosensor is developed based on Graphene-MOS2-Au-TiO2-SiO2 hybrid structure for formalin detection. This developed sensor sensed the presence of formalin by applying attenuated total reflection (ATR). In ATR method, we developed and observed two characteristics curve, one is “SPR angle versus minimum reflectance (Rmin)” and another is “SPR frequency (SPRF) versus maximum transmittance (Tmax). In the proposed sensor, Chitosan is used as probe legend to perform specific reaction with the formalin (40% formaldehyde) as target legend. Here, graphene and MoS2 both are used as biomolecular acknowledgment element (BAE). And TiO2 as well as SiO2 bilayers are used to improve sensor sensitivity and Gold (Au) is to sharp SPR curve. In numerical results, the variation of SPRF and SPR angle for inappropriate sensing of formalin is quiet insignificant which confirms the absence of formalin. On the other hand, these variations for appropriate sensing is considerably significant that confirms the presence of formalin. At the end of this article, a study of variation of sensitivity of the proposed biosensor in corresponding to the increment of refractive index with a refractive index step 0.01 RIU is measured. In inclusion of TiO2-SiO2 bilayers with Graphene-MOS2, maximum sensitivity of 85.375% more is numerically reported.
Highlights
Formalin (40% formaldehyde) is a toxic element soluble in water, has been classified as Group I Carcinogen to human beings by the International Agency for Research on Cancer (IRAC) [1]
The refractive index (RI) change will in turn prime to change in the surface plasmon resonance (SPR) angle and SPR frequency attributor that explains a change in propagation constant of surface plasmon waves (SPW) [6]
During intruding light energy to prism-gold interface, an evanescent wave is generated which is known as surface plasmon wave (SPW) mentioning in Introduction section that propagates with the different propagation constant from optical wave which is defined in Eq 4
Summary
Formalin (40% formaldehyde) is a toxic element soluble in water, has been classified as Group I Carcinogen to human beings by the International Agency for Research on Cancer (IRAC) [1]. Journal of Materials and Applications 2019;8(2): graphene has high adsorption ability and optical characteristics [7,8,9,10,11,12], MoS2 has high fluroscence quenching ability [11], and TiO2 & SiO2 show tremendous plasmonic effect near to TiO2-SiO2 interface facilitating effective light trapping [11]. These effective light trapping generates more surface plasmons (SPs) which will eventually enhance the SPR angle and frequency. The RI change will in turn prime to change in the SPR angle and SPR frequency attributor that explains a change in propagation constant of SPW [6]
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