I need to develop a PRISM(BK7) based SPR biosensor based on large area MoS2 and Graphene monolayer. To achieve my aim my requirement is in following steps.
1. First gold(Au) layer deposition (50nm thickness) on flat BK7 glass plate(Refractive Index=1.51) We will directly apply this chip on prism hypotenuse by using suitable adhesion material with similar refractive index to glass plate.
2. Next transfer of MoS2 monolayer (1 cm × 1 cm × 0.65 nm) thin film on Au layer.
3. Finally transfer of Graphene monolayer (1 cm × 1 cm × 0.345 nm ) thin film on MoS2 monolayer.
The PMMA transfer method is one that I would suggest using. In spite of its complexity, this approach provides coverage that is nearly continuous.
It is possible to create a support for the graphene by spin-coating it with a layer of polymethyl methacrylate (PMMA). Following the removal of the metal catalyst with the help of an etchant, the PMMA/graphene stack proceeds to be transferred to a different substrate. In order to finish the graphene transfer process, solvents are subsequently utilised to remove the PMMA.
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