Abstract
In this paper, a surface plasmon resonance sensor based on MXene and antimonene with an adhesive layer of TiO2 is numerically analyzed, using the transfer matrix method (TMM). First, the Au thickness is optimized at 48 nm. Then, antimonene and MXene layers are optimized to achieve high sensitivity with minimum reflectance. The sensitivity of the proposed SPR biosensor without using the TiO2 layer is 178.76°/RIU, which shows 6.34% sensitivity improvement than conventional SPR. The use of TiO2 as an adhesive layer between prism and gold (Au) enhances the sensitivity up to 224.26°/RIU, which is 33.7 and 25.77% better than conventional and proposed SPR biosensor without using TiO2, respectively. This is due to the attractive optical sensing properties of MXene (highly metallic conductivity) and antimonene (high carrier mobility, strong spin–orbit coupling, and stability). Here, antimonene is used as a biomolecular recognition element (BRE) layer, as it absorbs more biomolecules stably due to higher binding energies and larger surface area, even better than graphene.
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Acknowledgements
This work is supported by Dr. Abdul Kalam Technical University, Lucknow (India) under the Ph.D. Scheme, Homi Bhabha Teaching Assistant Research Fellowship. And this work is also partially supported by Science and Engineering Research Board (SERB), India (Project Grant: CRG/2019/002636).
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Raikwar, S., Srivastava, D.K., Saini, J.P. et al. 2D-antimonene-based surface plasmon resonance sensor for improvement of sensitivity. Appl. Phys. A 127, 92 (2021). https://doi.org/10.1007/s00339-020-04248-0
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DOI: https://doi.org/10.1007/s00339-020-04248-0